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首页> 外文期刊>International journal of hydrogen energy >Numerical study on supersonic combustion of hydrogen and its mixture with Ethylene and methane with strut injection
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Numerical study on supersonic combustion of hydrogen and its mixture with Ethylene and methane with strut injection

机译：喷射氢及其与乙烯和甲烷的混合物超音速燃烧的数值研究。

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In this paper, supersonic combustion and flow field of hydrogen and its mixture with ethylene and methane from strut injections in a Mach 2 supersonic flow are studied numerically. The fuel mixture of hydrogen, methane and ethylene represents the major products of pyrolysis of hydrocarbon fuels with large molecules such as kerosene as it acts as coolant and flows through cooling channels and absorbs heat. Detached Eddy Simulation with a reduced kinetic mechanism and steady flamelet model are applied to simulate turbulent combustion. The calculated temperature profiles of hydrogen are compared to the experimental results of DLR supersonic combustor for validation of the present numerical method. The supersonic combustion flows associated with shock waves, turbulent vortices and flame structures are studied. With addition of methane and ethylene, the flame zone moves further downstream of the strut and the maximum flow temperature at chamber exit decreases by 200 K. With analysis of total temperature ratios, it is found that combustion efficiency for hydrogen combustion is 0.91 and it decreases to 0.78 for the fuel mixture. The calculation of ignition delay time and flame speed reveals that fuel mixture of hydrogen and hydrocarbons has considerably larger delay time and smaller flame speed, that contributes to the weakened flame zone and lower combustion efficiency. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
机译：在本文中，数值研究了马赫数为2的超音速流中氢的高能燃烧和氢及其与乙烯和甲烷的混合物的流场。氢，甲烷和乙烯的混合燃料代表了烃类燃料与大分子（如煤油）的热解的主要产物，因为它充当冷却剂并流经冷却通道并吸收热量。应用具有简化动力学机制的分离涡流模拟和稳定小火焰模型来模拟湍流燃烧。将氢的计算温度曲线与DLR超音速燃烧器的实验结果进行比较，以验证本数值方法的有效性。研究了与冲击波，湍流涡流和火焰结构相关的超音速燃烧流。随着甲烷和乙烯的加入，火焰区进一步向支撑杆的下游移动，腔室出口的最大流动温度降低了200K。通过对总温度比的分析，发现氢燃烧的燃烧效率为0.91，并且降低了混合气为0.78。点火延迟时间和火焰速度的计算表明，氢和碳氢化合物的燃料混合物具有较大的延迟时间和较小的火焰速度，这有助于减弱火焰区域并降低燃烧效率。 （C）2018氢能出版物有限公司。由Elsevier Ltd.出版。保留所有权利。

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