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Investigation on flow field and heat transfer characteristics of film cooling with different swirling directions for coolant flow Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-03-02 Jian Zhang; Qun Zheng; Guoqiang Yue; Yuting Jiang
In this paper, a hexagonal prism inlet chamber is used to form a swirling flow for the film cooling, and three kinds of compound angle of film hole (γ = 10°, 20°, 30°) with clockwise swirling or counterclockwise swirling are used for numerical simulation studies. The influence of different compound angles of film hole and the swirling directions for the film cooling effectiveness are obtained. The
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Numerical investigation on flow instabilities in low-pressure steam turbine last stage under different low-load conditions Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-27 Ping Hu; Tong Lin; Rui Yang; Xiaocheng Zhu; Zhaohui Du
The modern power generation system requires steam turbines operating at flexible operating points, and flow instabilities readily occur in the low-pressure (LP) last stage under low-load conditions, which may cause failure of the last stage moving blades. Some studies have shown that within this operating range, a shift of the operating point may lead to flow instabilities. Numerical simulation has
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The impact of volute aspect ratio and tilt on the performance of a mixed flow turbine Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-27 Samuel P Lee; Simon M Barrans; Ambrose K Nickson
Current trends in the automotive industry towards engine downsizing means turbocharging now plays a vital role in engine performance. The purpose of turbocharging is to increase the engine inlet air density by utilising, the otherwise wasted energy in the exhaust gas. This energy extraction is commonly accomplished through the use of a radial turbine. Although less commonly used, mixed flow turbines
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Classical hydraulic ram pump performance in comparison with modern hydro-turbine pumps for low drive heads Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-25 Siddhi Kesharwani; Kupulwng Tripura; Punit Singh
We present a unique comparison of two types of renewable hydro pumping devices, namely the ram and turbine pump having different working principles. This comparison is based on experiments with these pumping devices at a field station in a village in central-east India. Our work identifies the major gaps in the study of large ram pumps, covering the hydraulic scaling conformance to creation of a unified
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Performance prediction of transonic axial multistage compressor based on one-dimensional meanline method Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-25 Yingying Zhang; Shijie Zhang
This study proposes a 1D meanline program for the modeling of modern transonic axial multistage compressors. In this method, an improved blockage factor model is proposed. Work-done factor that varies with the compressor performance conditions is added in this program, and at the same time a notional blockage factor is kept. The coefficient of deviation angle model is tuned according to experimental
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Coupling optimization of casing groove and blade profile for a radial turbine Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-24 Xing Wang; Wen Li; Xuehui Zhang; Haisheng Chen
In order to suppress the tip leakage loss and increase the isentropic efficiency in a radial turbine with low aspect ratio blade, a new coupling flow control technology including casing groove and NACA blade profile is proposed and optimized numerically. The coupling effects of casing groove size LS, groove number Numslot, maximum thickness location of profile MLT and leading parameter of profile LP
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Influences of slotted blade on performance and flow structure of a transonic axial compressor Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-17 Guochen Zhang; Tianyi Gao; Zhihui Xu; Pengcheng Liu; Chengfeng Zhang
Main reason of compressor instability is boundary layer separation on the surface of blades. As one of flow control methods of the compressor, slotted blade has attracted many researchers’ attention because of its simple geometric structure and remarkable flow control effect. In order to evaluate its availability in the compressor, a type of convergent slot is designed to implement in a single-stage
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Performance evaluation of a supercritical circulating fluidized bed boiler for power generation under flexible operation Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-15 Matteo Bruzzone; Silvia Ravelli
It is well known that the Łagisza power plant in Poland is the world’s first supercritical circulating fluidized bed (CFB) boiler, whose commercial operation started on June 2009. It has attracted a great deal of interest and operational data are publicly available, therefore it has been chosen as the object of the present study aimed at assessing load and fuel flexibility of supercritical CFB plants
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Multi-condition optimization of a cross-flow fan based on the maximum entropy method Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-14 Ding Yanyan; Jun Wang; Wei Wang; Boyan Jiang; Qianhao Xiao; Tao Ye
Cross-flow fans are widely used in heating, wind-curtains, and air-conditionings, as well as other ventilation systems. A single or double arc is generally used as the camber line of cross-flow fans, but this design leads to constraints in the geometry of the blade profiles. In this study, the camber line of a cross-flow fan blade was parameterized by five parameters based on the fourth-order Bezier
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Experimental comparison of the spray atomization of heavy and light fuel oil at different temperatures and pressures for pressure-swirl injector Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-14 Elyas Rostami; Hossein Mahdavy Moghaddam
In this study, the atomization of heavy fuel oil (Mazut) and diesel fuel at different pressures is compared experimentally. Also, the effects of temperature on the Mazut fuel atomization are investigated experimentally. Mass flow rate, discharge coefficient, wavelength, liquid film thickness, ligament diameter, spray angle, breakup length, and sature mean diameter are obtained for the Mazut and diesel
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A new correlation for estimating the gas turbine cost Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-14 Dominique Adolfo; Carlo Carcasci; Beniamino Pacifici
The recent changes in energy scenario with rising attention to decarbonization, introduction of new technology and renewable source have led to design power plant with the lowest values of cost of energy, investment payback period, CO2 emission, especially in cogeneration and combined cycle plants. The cost of a gas turbine, an industrial key intellectual property value, represents a large portion
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Analysis on the unsteady flow structures in the tip region of axial compressor Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-14 Mo-Ru Song; Bo Yang
The unsteady characteristic in the tip region of an axial compressor has been numerically studied with the help of the dynamic mode decomposition analysis. The characteristics of frequency and dynamic modes are compared and discussed under different operating points and different parameters, such as tip clearance and rotating speeds. For the flowfield structures in the tip region, such as tip leakage
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Load control and unsteady aerodynamics for floating wind turbines Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-09 Xin Shen; Xiaocheng Zhu; Zhaohui Du
Unlike fixed-base offshore wind turbine, the soft floating platform introduces 6 more degrees of freedom of motions to the floating offshore wind turbine. This may cause much more complex inflow environment to the wind turbine rotors compared with fixed-base wind turbine. The wind seen locally on the blade changes due to the motions of the floating wind turbine platform which has a direct impact on
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Numerical investigation of non-uniform flow in twin-silo combustors and impact on axial turbine stage performance Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-09 Hafiz M Hassan; Adeel Javed; Asif H Khoja; Majid Ali; Muhammad B Sajid
A clear understanding of the flow characteristics in the older generation of industrial gas turbines operating with silo combustors is important for potential upgrades. Non-uniformities in the form of circumferential and radial variations in internal flow properties can have a significant impact on the gas turbine stage performance and durability. This paper presents a comprehensive study of the underlying
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Flow unsteadiness and rotor-stator interaction in a two-stage axial turbine Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-04 Kaddour Touil; Adel Ghenaiet
This paper presents an in-depth investigation of the unsteady flows through two-stage high-pressure (hp) axial turbine with analyses of the rotor-stator interaction effects on the aerothermodynamic performance. The unsteady flow structures are characterized by the formation and convection of the tip leakage vortex and the hub corner vortices from the first stage blade-row through the second stage nozzle
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Experimental investigation of the influence on compressor cascade characteristics at high subsonic speed with pressure surface tip winglets Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-01-31 Wanyang Wu; Jingjun Zhong
To investigate the influence of tip winglets on the tip leakage flow in a compressor cascade with different incidences, the experimental measurement combined with numerical simulation are used to study the conventional cascade and cascades with three different pressure surface tip winglets at five incidences of −6°, −3°, 0°, +3° and +6°. The results indicate that three different tip winglets at five
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A visualization study on flat plate heat pipe (FPHP) Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-01-27 Wan Yu; Dan Gao; Gang Wang; Tao Hu; Qichao Gong; Tian Wang
With the aim to analyze the flow pattern and heat transfer characteristics of the working fluid in a flat plate heat pipe (FPHP) which was sealed by a transparent tempered glass plate, ethanol, acetone, and R141b were taken as the working medium, and visual experiments were performed at different heat flux when the inclination angle was 90°. The vapor-liquid distribution and the heat transfer characteristics
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Effects of the staggered blades on unsteady pressure pulsations and flow structures of a centrifugal pump Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-01-20 Ning Zhang; Bo Gao; Chao Li; Dan Ni; Guoping Li
Effects of the staggered blades on unsteady pressure pulsations of a centrifugal pump with a specific speed ns=147 are investigated by the numerical simulation method. The obtained results are compared with the original blades. To clarify the resulting effects, eight monitoring points are used to extract pressure signals at three typical working conditions, and component at the blade passing frequency
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Calibration of thermopile heat flux gauges using a physically-based equation Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-01-17 Oliver J Pountney; Mario Patinios; Hui Tang; Dario Luberti; Carl M Sangan; James A Scobie; J Michael Owen; Gary D Lock
A thermopile, in which a number of thermocouple junctions are arranged on either side of a thin layer of insulation, is commonly used to determine the heat flux for steady-state measurements. Gauges using this method are available commercially and a new, generic calibration method is described here. For this purpose, an equation based on physical properties has been derived to determine the theoretical
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A GA-LSSVM approach for predicting and controlling in screw chiller Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-01-12 Chengcheng Tian; Ziwen Xing; Xi Pan; Haojie Wang
Performance of varying speed screw chiller is affected by many uncertainties. High precision prediction of its characteristics can guide the chiller to reach a better performance. This study presents an artificial intelligence model named least square support vector machine (LSSVM) with genetic algorithm (GA). Five parameters are predicted with the model, including COP, discharge pressure, suction
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Performance enhancement of Savonius wind turbine by blade shape and twisted angle modifications Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-01-11 Ahmed M Nagib Elmekawy; Hassan A Hassan Saeed; Sadek Z Kassab
Three-dimensional CFD simulations are carried out to study the increase of power generated from Savonius vertical axis wind turbines by modifying the blade shape and blade angel of twist. Twisting angle of the classical blade are varied and several proposed novel blade shapes are introduced to enhance the performance of the wind turbine. CFD simulations have been performed using sliding mesh technique
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Experimental and numerical thermal performance analysis with exergy destruction on nanofluid flow in tube with double strip helical screw inserts Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-01-05 Shashank Ranjan Chaurasia; RM Sarviya
Experimental and numerical analysis is arranged with exergy destruction to evaluate thermal performance of system on nanofluid flow in tube with single and double strip helical screw inserts at different values of twist ratio in laminar flow regime. CFD analysis has occurred on the fluent workbench of ANSYS software. The Nusselt number attained enhancement with the flow of nanofluid in double strip
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Effect of endwall suction on aerodynamic performance of compressor cascade with tip clearance at a large incidence angle Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-01-05 Botao Zhang; Bo Liu; Hejian Wang; Xiaochen Mao
In order to deeply analyze the application prospect of the boundary layer suction technique on the compressor, the flow control effect of endwall suction scheme on the tip leakage flow of a compressor cascade at a large incidence angle with complex internal flow structure and different loss proportion from the case at design incidence angle, was studied numerically, as well as on the overall aerodynamic
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Effects of struts profiles and skewed angles on the aerodynamic performance of gas turbine exhaust diffuser Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-01-05 Yuxuan Dong; Zhigang Li; Jun Li; Liming Song
The strut structure directly affects the flow field characteristics and aerodynamic performance of the gas turbine exhaust diffuser. The effects of the strut profiles and strut skewed angles on the aerodynamic performance of the exhaust diffuser at different inlet pre-swirls were numerically investigated using three-dimensional Reynolds-Averaged Navier-Stokes(RANS) and Realizable k-ε turbulence model
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Study on characteristics of vortex structures and irreversible losses in the centrifugal pump Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-12-29 Zhiyi Yuan; Yongxue Zhang; Cong Wang; Bohui Lu
The development of flow control methods in the centrifugal pump relies on further understanding of the characteristics of vortex structures and their irreversible losses. In this paper, the detached eddy simulation is conducted on a model centrifugal pump, which shows a good agreement with the experiment. Combining with three generations of vortex identification methods (vorticity, Q criterion, omega
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Investigation of the cavitation performance in an engine cooling water pump at different temperature Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-12-29 We Li; Pu Wu; Yongfei Yang; Weidong Shi; Weiqiang Li
Cavitation damage in engine cooling water pump is the main factor that shortens the lifespan of the cooling system and gives rise to undesirable phenomena such as vibration and noise. In order to reveal the influence of key factors such as temperature and speed on the cavitation performance of engine cooling water pump, the cavitation performance of the engine cooling water pump under different rotating
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Flow physics of highly loaded tandem compressor cascade with non-axisymmetric endwall profiling Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-12-26 Zhiyuan Cao; Wei Guo; Cheng Song; Bo Liu
Tandem configuration is an effective methodology to reduce flow separation on compressor blade suction surface and to improve blade loading. However, in modern highly loaded cases, corner separation remains as its single blade counterpart. In this study, non-axisymmetric endwall profiling (NAEP) was utilized in a highly loaded tandem cascade (diffusion factor D = 0.69), aiming at reducing its severe
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Numerical optimization of horizontal-axis wind turbine blades with surrogate model Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-12-07 Haipeng Wang; Xiao Jiang; Yun Chao; Qian Li; Mingzhou Li; Tao Chen; Weirui Ouyang
Wind energy is a widely used and developed the renewable energy, which has developed rapidly. At present, the design of the horizontal axis wind turbine blade mainly used Blade Element Momentum theory. In this paper, an optimization method of the wind turbine blade was proposed for improving the output power. The local twist angles of the blade were optimized. This method combined the surrogate model
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Aerothermal and aerodynamic performance of turbine blade squealer tip under the influence of guide vane passing wake Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-12-06 Bo Zhang; Xiaoqing Qiang
In this paper, the performance of the turbine blade squealer tip has been studied detailed aimed to highlight the impact of the upstream guide vane passing wake. The first stage of GE-E3 high-pressure turbine has been employed to perform the three-dimensional simulation and the computational domain has been scaled based on the domain scaling method. Boundary conditions are consistent with operating
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Generating axial compressor maps to zero speed Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-12-06 Luis E Ferrer-Vidal; Vassilios Pachidis; Richard J Tunstall
Gas turbine performance models typically rely on component maps to characterize engine component performance throughout the operational regime. For the sub-idle case, the lack of reliable rig test data or inability to run design codes far from design conditions entails that component maps have to be generated from the extrapolation of existing data at higher speeds. This undermines the accuracy of
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Aerodynamic optimization of a SCO2 radial-inflow turbine based on an improved simulated annealing algorithm Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-12-06 Yuqi Wang; Yunzhu Li; Di Zhang; Yonghui Xie
Supercritical carbon dioxide plays a vital role in the development of power generation applications. It owns the characteristics of high density and low viscosity, which can ensure a compact structure for turbomachinery. With the blossom of optimization algorithm, an interdisciplinary research which applies optimization method to a traditional design process of turbomachinery can accelerate the course
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Technico-economic modelling of ground and air source heat pumps in a hot and dry climate Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-12-01 Faisal Alshehri; Stephen Beck; Derek Ingham; Lin Ma; Mohammed Pourkashanian
In a hot and dry country such as Saudi Arabia, air-conditioning systems consume seventy per cent of the electrical energy. In order to reduce this demand, conventional air-conditioning technology should be replaced by more efficient renewable energy systems. These should be compared to the current standard systems which use air source heat pumps (ASHPs). These have a poor performance when the air temperature
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On the wind resource in Algeria: Probability distributions evaluation Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-11-26 Houdayfa Ounis; Nawel Aries
The present study aims to present a contribution to the wind resource assessment in Algeria using ERA-Interim reanalysis. Firstly, the ERA-Interim reanalysis 10 m wind speed data are considered for the elaboration of the mean annual 10 m wind speed map for a period starting from 01-01-2000 to 31-12-2017. Moreover, the present study intends to highlight the importance of the descriptive statistics other
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Economic analysis of a small combined cycle gas turbine power plant in the Italian electricity market Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-11-26 Dominique Adolfo; Carlo Carcasci
Despite the availability of new alternative energy sources, growing worldwide energy demand and emissions targets lead power plants to work optimizing performances. In this new scenario in which renewable energies are increasingly taking the field, it is also important to produce energy at a low price. Moreover, the variability of the energy market price complicates the analysis. Comparison between
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New experimental Nusselt number correlation for spiral plate heat exchanger optimized using a code Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-11-24 Meisam Ghodrati; Jamshid Khorshidi
A system of a spiral plate heat exchanger and its required auxiliaries was built. The pitches of heat exchanger were built differently to provide almost two geometrically different heat exchangers in a single package. Several experiments were done and working parameters of the heat exchanger were measured. A code was written to find a new optimised correlation that could approximate the Nusselt Number
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The ultra-high efficiency gas turbine engine, UHEGT, Part II: A numerical study on reducing the stator blade surface temperature by indexing fuel injectors and using film cooling Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-11-16 Seyed M Ghoreyshi; Meinhard T Schobeiri
In the Ultra-High Efficiency Gas Turbine Engine, UHEGT (introduced in our previous studies) the combustion process is no longer contained in isolation between the compressor and turbine, rather distributed within the axial gaps before each stator row. This technology substantially increases the thermal efficiency of the engine cycle to above 45%, increases power output, and reduces turbine inlet temperature
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Numerical investigation of wave interactions in an experimental wave-energy converter using OpenFOAM Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-11-10 Ali Sangtarash; Ehsan Roohi
In this paper, OpenFOAM wave generation and active wave absorption boundary conditions were used to simulate wave interaction of a specific experimental wave energy converter (WEC) with equilibrium buoys and two power take-off systems that work in parallel, over a broad range of wave conditions. Two solitary and cnoidal wave generation boundary conditions for three different wave heights were implemented
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Experiment study on condensation heat transfer and pressure drop of steam flow inside rectangular tube with different aspect ratio Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-11-08 Yan Yan; Jixian Dong; Tong Ren; Shiyu Feng
In this study, the condensation heat transfer coefficient and pressure drop of steam are obtained in small rectangular tubes with different aspect ratios. The experiments were carried out on three rectangular tubes with aspect ratios of 1:2, 1:3 and 1:5, with mass flux between 25 and 45 kg/m2s, and vapor qualities between 0.1 and 0.8. The experimental data were analyzed to determine the effect of vapor
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On the far-field boundary condition treatment in the framework of aeromechanical computations using ANSYS CFX Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-10-27 Tobias R Mueller; Damian M Vogt; Magnus Fischer; Bent A Phillipsen
This numerical study aims at predicting the reflective behavior of different conventional inlet and outlet far-field boundary conditions as well as available non-reflecting boundary conditions (NRBC) implemented in the commercial CFD solver ANSYS CFX. An isolated rotor model of an axial turbine stage with prescribed blade displacement is applied as test case to consider a representative application
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Influence of fluid-structure interaction modelling on the stress and fatigue life evaluation of a gas turbine blade Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-10-27 Iroizan Ubulom
A computational method of fluid-structure coupling is implemented to predict the fatigue response of a high-pressure turbine blade. Two coupling levels, herein referred to as a “fully coupled” and “decoupled” methods are implemented to investigate the influence of multi-physics interaction on the 3 D stress state and fatigue response of a turbine blade. In the fully-coupled approach, the solutions
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Numerical and experimental investigation of exhaust manifold configurations of turbo-charged diesel engines Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-10-27 Sheng Liu; Weilin Zhuge; Yangjun Zhang
The exhaust energy recovery is significant for engine fuel efficiency. However, the exhaust gas interference and the loss of flow affect the utilization of exhaust energy of multi cylinder turbocharged diesel engine seriously. In this paper, through Particle Image Velocimetry experiment and computational fluid dynamics simulation of exhaust T-junction flow field, the characteristics of junction local
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Feasibility study of the energy and economic gain that can be achieved by driving the boiler feedwater pump with a backpressure steam turbine Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-10-26 Selcuk Selimli; Savas Sunay
The low-pressure steam requirement in the iron and steel production plant is obtained through pressure reduction stations with unrestrained expansion. In this study, the feasibility of obtaining the low-pressure steam that is needed in the plant in a backpressure turbine instead of pressure reduction stations has been studied. In this way, it is foreseen that a significant amount of wasted energy during
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Structural design and parameter optimization on a waste valve for hydraulic ram pumps Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-10-25 Jiazhen Li; Kailin Yang; Xinlei Guo; Wei Huang; Tao Wang; Yongxin Guo; Hui Fu
Hydraulic ram pump is an automatic water-lifting machinery, which converts the low-head potential energy of a large volume of water into a small high-head potential energy through the periodic open and close of waste valve and delivery valve. The pump would run inefficiently or even fail if the valves are poorly designed. In this paper, a novel and reliable waste valve of lift-check-valve structure
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Effect of vaned diffuser clocking position on hydraulic performance and pressure pulsation of centrifugal pump Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-10-22 Hongyu Guan; Wei Jiang; Yuchuan Wang; Gaoyang Hou; Xiangyuan Zhu; Hui Tian; Hongling Deng
The clocking position of the vaned diffuser, the circumferential position of the vaned diffuser relative to the volute, has a certain effect on the performance of the centrifugal pump. Therefore, this paper studies the guide vane centrifugal pump from the aspects of pressure pulsation, hydraulic performance, and energy loss. The maximum difference in efficiency is 3.4% under the design flow rate, and
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Experimental investigations on atomization characteristics of dual-orifice atomizers part I: Optimization method formation Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-10-06 Xiongjie Fan; Cunxi Liu; Yong Mu; Yulan Wang; Kaixing Wang; Gang Xu
In this paper, influences of structure parameters on mass flow and atomization characteristics (spray cone angle, SMD, liquid film fusion and separation) of dual-orifice atomizers were investigated using Fraunhofer diffraction optical instrument and high-speed shadowgraph technique. The main influential structure parameters are obtained by structural parameter sensitivity analysis. Liquid film fusion
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Fans arrangement analysis in oil forced air natural cooling method of power transformer radiator Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-10-06 Mohammad Ali Taghikhani; Mohammad Reza Afshar
The cooling of radiators in power transformers employing natural oil-air forced method is the purpose of this study. Two modes used for cooling fans, namely vertical and horizontal placement, will be compared as well. Four sets of radiators have been studied in this research, and in each set, 14 fins and three fans with a diameter of half a meter have been used. The fans will be arranged such that
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Prediction of critical heat flux in flow boiling process under the effect of different operating parameters Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-09-30 Ehsan Abedini; Mohammad Behboudi; Arash Mohammadi Karachi; Reza Hamidi Jahromi; Kianoush DolatiAsl
In the present study numerical simulation of flow boiling process has been conducted for evaluation of critical heat flux conditions under the effect of different parameters (mass flux, heat flux, channel length and surface roughness). Comparison between the results of the present study and previous researches were done. The comparison shows a good agreement between the present study and previous researches
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Transient characteristics of internal flow fields of mixed-flow pump with different tip clearances under stall condition Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-09-30 Leilei Ji; Wei Li; Weidong Shi; Ramesh Agarwal
This paper investigates the influence of different tip clearances on the transient characteristics of mixed-flow pump under stall condition. The instantaneous internal flow fields of mixed-flow pump with four tip clearances (0.2 mm, 0.5 mm, 0.8 mm and 1.1 mm) are explored by conducting unsteady time accurate simulations. Reynolds-averaged Navier-Stokes (RANS) equations are employed in the simulations
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Numerical study of the influence of splitter geometry on secondary flow control Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-09-26 Tao Bian; Xin Shen; Jun Feng
In turbmachinery, splitters are used to control secondary flow and to improve the aerodynamic performance of outlet guide vane (OGV) of axial fan. However, there is few information in the open literature focusing on the effect of the splitter geometry on the secondary flow control. In this work, the numerical investigations were performed for NACA 65-010 profile with different splitters. The spacing
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Impact of tower spacing on the performance of multiple short natural draft dry cooling towers for calm conditions Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-09-26 Mehrdad Khamooshi; Timothy N Anderson; Roy J Nates
Natural draft dry cooling towers (NDDCTs) serve a fundamental role in the deployment of concentrating solar power (CSP) plants. In a multi-tower cooling system, there is a need to be able to position them correctly so that their performance as a group is maximised. To do this, an understanding of the effect they have on one another is needed. Hence, this work investigated the effect of tower spacing
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Experimental investigations on atomization characteristics of dual-orifice atomizers part II: Optimization method application Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-09-21 Xiongjie Fan; Cunxi Liu; Fuqiang Liu; Qianpeng Zhao; Jinhu Yang; Gang Xu
In this paper, the optimization method we obtained from dual-orifice atomizers previously is used to design and optimize new dual-orifice atomizers, whereas there are some differences between the new dual-orifice atomizer and dual-orifice atomizer used in Part I. For example, the mass flow is much smaller, there is an expansion angle at pilot nozzle to regulate pilot stage spray cone angle, and there
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Multidisciplinary assessment of blade number and manufacturing parameters for the performance of centrifugal fans Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-09-14 Jun Ni; Rui Liu; Yu Sun
This work targets the development of the multidisciplinary design for centrifugal fans, based on the calculation of the fan performance following changes in the fan structure and manufacture. A parametric method that starts from the blade number and manufacturing parameters is first developed to control the shape of fan assembly and its fluid domain. The parametric code, and the aerodynamic and structure
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Analysis of inlet flow passage conditions and their influence on the performance of an axial-flow pump Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-09-14 Wenpeng Zhang; Lijian Shi; Fangping Tang; Xiaohui Duan; Haiyu Liu; Zhuangzhuang Sun
The inlet flow conditions will directly affect impeller performance, which is of great concern to pump designers. In this study, based on two axial-flow pump devices, the influence of the evaluation criteria of inlet flow conditions and numerical grid scales on the accuracy of the simulation are investigated, the correctness of the numerical simulation are verified by experiments. The axial velocity
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Numerical analysis of the effects of circumferential groove casing suction in a counter-rotating axial flow compressor Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-09-10 Tian Liang; Bo Liu; Stephen Spence; Liying Jiao
To extend the current understanding of the circumferential groove casing suction applied to a counter-rotating axial flow compressor, the impact of different axial locations of the circumferential suction groove on the characteristics of the tip leakage flow (TLF) and the corresponding physical mechanisms producing the stability enhancement have been studied based on validated numerical simulations
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Experimental investigation of non-premixed and partially premixed methane lifted flames established on a lobed swirl injector Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-09-09 Lei Jiang; Gang Li; Xi Jiang; Hongbin Hu; Bo Xiao; Yanji Xu; Zhijun Lei
A lobed swirl injector was tested to examine its potential in combustion control for non-premixed and partially premixed flames. It was found in the experiment that the flame derived from the injector changed between attached and detached flames at different conditions, demonstrating a promising way to control combustion. When air is supplied through the external channel of the lobed swirl injector
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Effects of inlet guide vane and blade pitch angles on the performance of a submersible axial-flow pump Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-09-02 Youn-Sung Kim; Hyeon-Seok Shim; Kwang-Yong Kim
This study investigates the effects of inlet guide vane (IGV) and blade pitch angles on the steady and unsteady performance of a submersible axial-flow pump. To analyze the interaction between the IGVs and the rotor blades, both steady and unsteady three-dimensional Reynolds-averaged Navier-Stokes equations were used with shear stress transport turbulence closure. Hexahedral meshes were used in the
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The ultra-high efficiency gas turbine engine, UHEGT, part I: Design and numerical analysis of the multistage system Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-08-27 Seyed M Ghoreyshi; Meinhard T Schobeiri
The Ultra-High Efficiency Gas Turbine Engine (UHEGT) was introduced in our previous studies. In UHEGT, the combustion process is no longer contained in isolation between the compressor and turbine. It is rather distributed in multiple stages and integrated within the high-pressure turbine stator rows. Compared to the current most advanced conventional gas turbines, UHEGT considerably improves the efficiency
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Parametric studies on interacting parameters influencing heat pipe performance Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-08-25 Vineet Kumar; Sanjay V Jain; Yash Shah; Vikas J Lakhera
The performance of a heat pipe is governed by many parameters, the effects of which may influence each other. Hence, it is utmost important to optimize the combination of these parameters for an effective energy transfer in a heat pipe. In the present study, the interacting effects of four different parameters affecting the effectiveness of heat pipe are studied namely the fluid filling ratio (20%
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Unscented Kalman filtering method for scheduling photovoltaic power generation system fluctuations Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-08-17 Zheng Li; Liping Zhang; Rui Zhang; Xin Wang; Zengtao Xue; Hexu Sun
For the intermittent nature of renewable resources (such as wind and solar), smooth power fluctuations are required before the energy conversion system can be injected into the grid. The battery system is a typical smoothing control method for photovoltaic power. The long-term overcharge and overdischarge make the battery energy storage scheme unattractive. In this paper, the output power fluctuation
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Loss analysis of the shrouded radial-inflow turbine for compressed air energy storage Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2020-08-11 Ziyi Shao; Wen Li; Aiting Li; Xing Wang; Xuehui Zhang; Haisheng Chen
The shrouded radial-inflow turbine is widely employed as a power generation device in the compressed air energy storage (CAES) system. The loss mechanism and off-designed performance of the shrouded radial turbine are lesser known hitherto and should be deeply understood. Loss analyses of a shrouded radial turbine are conducted numerically based on the first and second laws of thermodynamics in the