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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); Fan XJ(范学军)
Source Publication20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2015
2015
Conference Name20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2015
Conference DateJuly 6, 2015 - July 9, 2015
Conference PlaceGlasgow, United kingdom
AbstractThe 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.
KeywordComparative Studies Flow Charac Teristics High Order Harmonics High Resolution Instability Modes Near Field Structure Shock Structure Under Expanded Jets
DepartmentLHD超声速燃烧
ISBN9781624103209
URL查看原文
Indexed ByEI
Language英语
Document Type会议论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/60162
Collection高温气体动力学国家重点实验室
Recommended Citation
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],2015.
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