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Effects of total pressures and equivalence ratios on kerosene/air rotating detonation engines using a paralleling CE/SE method
Defence Technology ( IF 5.0 ) Pub Date : 2020-09-24 , DOI: 10.1016/j.dt.2020.09.015
Fang Wang , Chun-sheng Weng , Yu-wen Wu , Qiao-dong Bai , Quan Zheng , Han Xu

In this paper, the kerosene/air rotating detonation engines(RDE) are numerically investigated, and the emphasis is laid on the effects of total pressures and equivalence ratios on the operation characteristics of RDE including the initiation, instabilities, and propulsive performance. A hybrid MPI + OpenMP parallel computing model is applied and it is proved to be able to obtain a more effective parallel performance on high performance computing(HPC) systems. A series of cases with the total pressure of 1 MPa, 1.5 MPa, 2 MPa, and the equivalence ratio of 0.9, 1, 1.4 are simulated. On one hand, the total pressure shows a significant impact on the instabilities of rotating detonation waves. The instability phenomenon is observed in cases with low total pressure (1 MPa) and weakened with the increase of the total pressure. The total pressure has a small impact on the detonation wave velocity and the specific impulse. On the other hand, the equivalence ratio shows a negligible influence on the instabilities, while it affects the ignition process and accounts for the detonation velocity deficit. It is more difficult to initiate rotating detonation waves directly in the lean fuel operation condition. Little difference was observed in the thrust with different equivalence ratios of 0.9, 1, and 1.4. The highest specific impulse was obtained in the lean fuel cases, which is around 2700 s. The findings could provide insights into the understanding of the operation characteristics of kerosene/air RDE.



中文翻译:

总压力和当量比对使用并行 CE/SE 方法的煤油/空气旋转爆震发动机的影响

本文对煤油/空气旋转爆震发动机(RDE)进行了数值研究,重点研究了总压力和当量比对RDE工作特性的影响,包括起爆、不稳定性和推进性能。应用混合 MPI + OpenMP 并行计算模型,并被证明能够在高性能计算(HPC)系统上获得更有效的并行性能。模拟了总压力为1 MPa、1.5 MPa、2 MPa,当量比为0.9、1、1.4的一系列工况。一方面,总压力对旋转爆轰波的不稳定性有显着影响。这种不稳定现象在总压力较低(1 MPa)的情况下观察到,并随着总压力的增加而减弱。总压力对爆轰波速和比冲的影响很小。另一方面,当量比对不稳定性的影响可以忽略不计,而它会影响点火过程并说明爆速不足。在稀燃料操作条件下直接引发旋转爆震波更困难。当当量比为 0.9、1 和 1.4 时,推力几乎没有差异。在稀燃料情况下获得了最高的比冲,约为 2700 秒。这些发现可以为了解煤油/空气 RDE 的运行特性提供见解。而它会影响点火过程并解释爆速不足。在稀燃料操作条件下直接引发旋转爆震波更困难。当当量比为 0.9、1 和 1.4 时,推力几乎没有差异。在稀燃料情况下获得了最高的比冲,约为 2700 秒。这些发现可以为了解煤油/空气 RDE 的运行特性提供见解。而它会影响点火过程并解释爆速不足。在稀燃料操作条件下直接引发旋转爆震波更困难。当当量比为 0.9、1 和 1.4 时,推力几乎没有差异。在稀燃料情况下获得了最高的比冲,约为 2700 秒。这些发现可以为了解煤油/空气 RDE 的运行特性提供见解。大约是 2700 秒。这些发现可以为了解煤油/空气 RDE 的运行特性提供见解。大约是 2700 秒。这些发现可以为了解煤油/空气 RDE 的运行特性提供见解。

更新日期:2020-09-24
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