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Impact of an Exhaust Throat on Semi-Idealized Rotating Detonation Engine Performance.

机译：排气喉对半理想旋转爆轰发动机性能的影响。

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摘要

A computational fluid dynamic (CFD) model of a rotating detonation engine (RDE) is used to examine the impact of an exhaust throat (i.e., a constriction) on performance. The model simulates an RDE which is premixed, adiabatic, inviscid, and which contains an inlet valve that prevents backflow from the high pressure region directly behind the rotating detonation. Performance is assessed in terms of ideal net specific impulse which is computed on the assumption of lossless expansion of the working fluid to the ambient pressure through a notional diverging nozzle section downstream of the throat. Such a semi-idealized analysis, while not real-world, allows the effect of the throat to be examined in isolation from, rather than coupled to (as it actually is) various loss mechanisms. For the single Mach 1.4 flight condition considered, it is found that the addition of a throat can yield a 9.4 percent increase in specific impulse. However, it is also found that when the exit throat restriction gets too small, an unstable type of operation ensues which eventually leads to the detonation failing. This behavior is found to be somewhat mitigated by the addition of an RDE inlet restriction across which there is an aerodynamic loss. Remarkably, this loss is overcome by the benefits of the further exhaust restrictions allowed. The end result is a configuration with a 10.3 percent improvement in ideal net specific thrust.

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作者
Paxson, D. E.;
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作者单位

National Aeronautics and Space Administration, Cleveland, OH. NASA John H. Glenn Research Center at Lewis Field.;

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年度 2016
页码 1-18
总页数 18
原文格式 PDF
正文语种 eng
中图分类 T;
原文服务方国家工程技术数字图书馆
关键词
Exhaust flow simulation; Throats; Fuel flow; Specific impulse; Constrictions; Rotation; Gas turbine engines; Propulsion system performance; Computational fluid dynamics; Dynamic models; Fluid pressure; Pressure distribution; Detonation; Inviscid flow; Valves; Losses; Premixing; Thrust; Working fluids;

机译：排气流模拟;喉管;燃料流量;比冲;收缩;旋转;燃气●涡轮发动机;推进系统性能;计算流╲体动力学;动态模型;流体压力;压力分布;爆轰;无形流动;阀门;损失;预混;推力;工作液;

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Impact of an Exhaust Throat on Semi-Idealized Rotating Detonation Engine Performance.

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