Purpose

The purpose of this paper is to analyze the effect of pressure fluctuations on the combustion efficiency of the hydrogen fuel injected into the supersonic oxidizing cross flow. The pressure fluctuations are imposed on inlet air flow and also on the fuel flow stream. Two different situations are considered: the combustion chamber once without and again with the inlet standing oblique shock wave.

Design/methodology/approach

The pressure fluctuations are imposed on inlet air flow and also on the fuel flow stream. Two different situations are considered: the combustion chamber once without and again with the inlet standing oblique shock wave. The unsteady turbulent reacting flow solver is developed to simulate the supersonic flow field in the combustion chamber with detail chemical kinetics, to predict the time-variation of the combustion efficiency due to the imposed pressure fluctuations.

Findings

The results show that the response of the reacting flow field depends on both the frequency of fluctuations and the existence of the inlet shock wave. In addition, the inlet standing shock wave has some attenuating role, but the reacting flow shows an amplifying role on imposed oscillations which is also augmented by imposing anti-phase fluctuations on both inlet and fuel flow streams.

Originality/value

This study is performed to analyze the instabilities in the supersonic combustion which has not been considered before in this manner.

中文翻译：

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进气和燃油流量压力波动对超音速燃烧的影响

目的

本文的目的是分析压力波动对注入超音速氧化错流的氢燃料燃烧效率的影响。压力波动施加在进气流以及燃油流上。考虑了两种不同的情况：燃烧室一次没有进气口，一次又一次带有斜向冲击波。

设计/方法/方法

压力波动施加在进气流以及燃油流上。考虑了两种不同的情况：燃烧室一次没有进气口，一次又一次带有斜向冲击波。开发了非稳态湍流反应流求解器，以详细的化学动力学模拟燃烧室中的超音速流场，以预测由于施加的压力波动而导致的燃烧效率随时间的变化。

发现

结果表明，反应流场的响应既取决于波动的频率，又取决于入口激波的存在。此外，进气口驻波冲击具有一定的衰减作用，但反应流对施加的振荡显示出放大作用，并且通过在进气流和燃料流上施加反相波动也可以增强这种作用。

创意/价值

进行这项研究是为了分析超音速燃烧中的不稳定性，这种不稳定性以前从未被考虑过。