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Experimental Investigation of a Bidirectional Impulse Turbine for Oscillating Flows at Various Resistive Loads
IEEE Journal of Oceanic Engineering ( IF 4.1 ) Pub Date : 2021-01-01 , DOI: 10.1109/joe.2020.2977179
Suchithra Ravikumar , Anandanarayanan R , Aravind George , Biren Pattanaik , Prasad Vinayak Dudhgaonkar , Purnima Jalihal , Abdus Samad

A bidirectional impulse turbine is a self-rectifying air turbine used in an oscillating water column wave energy converters. Most of the study on bidirectional impulse turbines involves steady-state performance analysis; however, the performance under oscillating airflow conditions is necessary to understand its behavior. The objective of this study is to experimentally analyze an optimized and numerically investigated bidirectional impulse turbine with fixed guide vane subjected to oscillating airflow conditions. A bidirectional airflow test facility developed at Indian Institute of Technology Madras, Chennai, India is employed to determine the aerodynamic characterization of the turbine and the dynamics involved in each of the coupling stages. The test rig consists of a piston chamber assembly, which provides different airflow rates by varying the stroke length (SL) and cycle time. Emphasis is made on the pressure and flow rate coefficients of the turbine, turbine-generator coupling, and power developed for different input conditions. The operating range of the turbine is mapped for four different frequencies and three SLs. Different electrical loading and the power output were analyzed for accelerations and decelerations of inflow and outflow. The preliminary dynamic characterization of the turbine with respect to nondimentionalized pressure coefficient and flow coefficient was determined for inflow and outflow. The power output is found to be in strong correlation with the flow rate and angular rotation of the rotor. The turbine analyzed in the experimental test rig will be proceeded with real sea testing on the Indian coast by the National Institute of Ocean Technology, Chennai, India.

中文翻译:

双向脉冲涡轮机在各种阻性负载下振荡流的实验研究

双向脉冲涡轮机是一种用于振荡水柱波浪能转换器的自整流空气涡轮机。大多数关于双向脉冲涡轮机的研究涉及稳态性能分析;然而,振荡气流条件下的性能对于了解其行为是必要的。本研究的目的是对经过优化和数值研究的双向脉冲涡轮机进行实验分析,该涡轮机带有固定导叶在振荡气流条件下。在印度钦奈的印度马德拉斯理工学院开发的双向气流测试设备用于确定涡轮机的空气动力学特性以及每个耦合阶段所涉及的动力学。试验台由活塞室组件组成,它通过改变冲程长度 (SL) 和循环时间来提供不同的气流速率。重点是涡轮的压力和流量系数、涡轮-发电机耦合以及针对不同输入条件开发的功率。涡轮机的运行范围被映射为四个不同的频率和三个 SL。针对流入和流出的加速和减速分析了不同的电力负载和功率输出。确定了流入和流出的涡轮机在无量纲化压力系数和流量系数方面的初步动态特性。发现功率输出与转子的流速和角旋转密切相关。
更新日期:2021-01-01
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