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Assessment of NOx emissions of the Scimitar engine at Mach 5 based on a thermodynamic cycle analysis
International Journal of Hydrogen Energy ( IF 7.2 ) Pub Date : 2019-03-14 , DOI: 10.1016/j.ijhydene.2019.02.133
Tayfun Tanbay , Muhammed Bişar Uca , Ahmet Durmayaz

The Scimitar engine is a new advanced propulsion system designed to propel the aircraft A2 of the LAPCAT project. It is a hybrid system that utilizes the features of turbofan, ramjet and air-turborocket. Hydrogen and air are used as the fuel and oxidant, respectively, while helium is used to transfer heat from the hot incoming air to the hydrogen in the engine. In this study, we present a thermodynamic cycle analysis of the Scimitar engine for the assessment of NOx emissions. The combustion of fuel is studied in detail with an equilibrium model taking into account various dissociation and formation reactions since high levels of temperatures are achieved in its combustion chamber. The NOx emissions of the engine at Mach 5 and the effects of fuel and air flow rates, cruise speed and altitude on these emissions are presented by solving a nonlinear system of equations formed through our novel thermodynamic model. The results show that the NO emissions of the engine can be diminished significantly by decreasing air flow rate, cruise speed and altitude and by increasing the fuel flow rate. The variations of NO2 emissions with these parameters are similar except the variation with altitude which has an inverse effect as compared to the variation of NO.



中文翻译:

NO的评估X基于热力循环分析在马赫5弯刀发动机的排放

弯刀发动机是一种新的先进推进系统,旨在推动LAPCAT项目的飞机A2。它是一种混合动力系统,利用了涡扇,冲压喷气发动机和空气涡轮增压器的功能。氢气和空气分别用作燃料和氧化剂,而氦气则用于将热量从进入的热空气传递到发动机中的氢气。在这项研究中,我们提出了弯刀引擎NO评估的热力循环分析X排放。由于在燃烧室中实现了高水平的温度,因此利用平衡模型详细研究了燃料的燃烧,该模型考虑了各种解离和形成反应。该NO X通过求解由我们新颖的热力学模型形成的方程组的非线性系统,可以得出发动机在5马赫转速下的排放以及燃油和空气流速,巡航速度和高度对这些排放的影响。结果表明,通过降低空气流量,巡航速度和高度以及增加燃料流量,可以显着减少发动机的NO排放。这些参数下的NO 2排放变化类似,只是高度变化与NO的变化具有相反的影响。

更新日期:2020-01-17
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