Experimental study of rocket plume expansion in the rocket-based combined-cycle engine under the ejector mode

Yizhi Yao; Mingbo Sun; Yuhui HuangPeibo LiBin AnDongdong ZhangRui GuMenglei LiTaiyu WangJikai ChenJiaoru Wang

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Experimental study of rocket plume expansion in the rocket-based combined-cycle engine under the ejector mode

机译：Experimental study of rocket plume expansion in the rocket-based combined-cycle engine under the ejector mode

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In this paper, we utilized high-speed schlieren technology to investigate the impact of expansion degrees on the evolution of subsonic-supersonic mixing layers. Specifically, we explored characteristics of supersonic and subsonic flows with Mach numbers of 1.27 and 0.75. Our findings revealed that over-expansion of the supersonic flow facilitated transition, causing the generation position of Kelvin-Helmholtz vortexes to shift forward by 35.3 ～ 45.1. Additionally, the growth rate of visual thickness was observed to increase to 2.7 ～ 3.5 times in the incipient stage of the mixing layer under these conditions. We employed root-mean-square analysis to observe the rapid increase of turbulence intensity and the expansion of the strong turbulent region in the incipient stage (within x/H = 0 ～ 1.5), from under-expansion to over-expansion conditions. Our results indicate that the turbulent region and intensity play a crucial role in the evolution of mixing layers. Spatial correlation analysis revealed larger turbulent structures under over-expansion effects, with structures at x/H = 1.0 being over 8.2 larger than those under weak under-expansion conditions. This turbulent mechanism explains why the over-expansion of rocket plumes can enhance mixing layers. Therefore, designing the rocket in the over-expansion state is an effective strategy for rocket-based combined-cycle engines under the ejector mode. Moreover, we noted that mixing layers and Kelvin-Helmholtz vortexes deflected to the low-pressure flow side, and pressure-unmatched conditions would cause flatten turbulent structures in subsonic-supersonic mixing layers.

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来源
《Aerospace science and technology》 |2023年第7期|108308.1-108308.11|共11页
作者
Yizhi Yao; Mingbo Sun; Yuhui HuangPeibo LiBin AnDongdong ZhangRui GuMenglei LiTaiyu WangJikai ChenJiaoru Wang;
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作者单位

Science and Technology on Scramjet Laboratory, College of Aerospace Science and Engineering. National University of Defense Technology, Changsha, Hunan 410073, China;

Center for Project Management of Equipment Development Department, Beijing, 110000, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类航空;
关键词
Rocket-based combined-cycle; Ejector mode; Mixing layer; K-H vortex; Turbulent structure;

Experimental study of rocket plume expansion in the rocket-based combined-cycle engine under the ejector mode

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