A comparative study of highly underexpanded nitrogen and hydrogenjets using large eddy simulation

	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)
会议录名称	20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2015
	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
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.
关键词	Comparative Studies Flow Charac Teristics High Order Harmonics High Resolution Instability Modes Near Field Structure Shock Structure Under Expanded Jets
课题组名称	LHD超声速燃烧
ISBN号	9781624103209
URL	查看原文
收录类别	EI
语种	英语
文献类型	会议论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/60162
专题	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]20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2015,2015.

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