A comparative study of highly underexpanded nitrogen and hydrogenjets using large eddy simulation | |
Li XP(李晓鹏); Wu K(吴坤); Yao W(姚卫)![]() ![]() | |
2015 | |
会议名称 | 20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2015 |
会议日期 | July 6, 2015 - July 9, 2015 |
会议地点 | Glasgow, United kingdom |
关键词 | Comparative studies Flow charac teristics High order harmonics High resolution Instability modes Near field structure Shock structure Under expanded jets |
中文摘要 | The three-dimensional large eddy simulations of highly underexpanded hydrogen and nitrogen jets at the same NPR of 5.60 at Re~105are performed. The flow characteristic for both jets are discussed and compared in detail based on the high resolution LES data. It is found that the H2jet mixes more rapidly with the ambient air but has a much smaller mixing area on cross-section planes. The classical near-field structures of highly underexpanded jets are well captured by the current LES modeling, and the shape and size of Mach barrel for both jets are very similar and also agree well with the experimental measurement and the previous studies. However, the flow field and the shock structures after the Mach disk differ greatly. The density values in the annular shear layer for H2jet aremuch lower because of its smaller molecular mass. Meanwhile, the H2jet has a much longer jet core and more shock cells. In addition, the dominant instability mode is helical for the N2jet, but is axisymmetric for the H2jet. There are two discrete peaks of fs=37.086 kHz and f2s=45.695 kHz in the spectrum of the N2jet, which are both single helical modes.The spectrum of the H2jet is characterized by a fundamental screech frequency of fs=47.020 kHz and its high order harmonics. © 2015, AIAA American Institute of Aeronautics and Astronautics. All rights reserved. |
收录类别 | EI |
会议网址 | http://dx.doi.org/10.2514/6.2015-3573 |
会议录 | 20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2015
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语种 | 英语 |
ISBN号 | 9781624103209 |
内容类型 | 会议论文 |
源URL | [http://dspace.imech.ac.cn/handle/311007/60162] ![]() |
专题 | 力学研究所_高温气体动力学国家重点实验室 |
推荐引用方式 GB/T 7714 | Li XP,Wu K,Yao W,et al. A comparative study of highly underexpanded nitrogen and hydrogenjets using large eddy simulation[C]. 见:20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2015. Glasgow, United kingdom. July 6, 2015 - July 9, 2015.http://dx.doi.org/10.2514/6.2015-3573 . |
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