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Numerical investigation of the axial impulse load during the startup in the shock tunnel
Meng BQ(孟宝清); Han GL(韩桂来); Luo ZT(罗长童); Jiang ZL(姜宗林)
2018-02-01
发表期刊AEROSPACE SCIENCE AND TECHNOLOGY
卷号73页码:332-342
ISSN1270-9638
摘要A shock tunnel is a representative type of ground-based equipment in the hypersonic field, which has the advantage of free stream of excellent quality. Accurate measurements of aerodynamic forces in the shock tunnel are great challenges. The impulse loads during the start-up process induce the vibration of the model and its support. Aerodynamic signals are disturbed by vibrational signals. The identification of the starting time of the steady periodic vibration and excited natural frequencies of the whole structure would contribute to improve the accuracy of measurement. These two factors are closely related to the properties of the impulse forces. However, there is currently no published research on the impulse forces. In this paper, the type of impulse forces (drag history) acting on the sharp cone during the start-up process was investigated by numerical simulation. The distribution of the static pressure of the typical wave structures was found to have a significant influence on the types of the drag history. A formula, based on the physical analysis of start-up process, was put forward to estimate the starting time of the steady stage. Additionally, the subsequent analysis and design optimization such as vibration of structure and disturbing frequencies needed an analytical and simple formation of drag history. Thus, the drag history was approximated by numbers of sine functions. Different phases exhibited notable difference in composition. Also, a metric denoted as the energy coefficient was derived to identify the critical frequencies and simplify the analytical expression of the impulse force. (C) 2017 Elsevier Masson SAS. All rights reserved.
关键词Hypersonic Shock tunnel Start-up process Impulse force Vibration
DOI10.1016/j.ast.2017.12.013
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收录类别SCI ; EI
语种英语
WOS记录号WOS:000424185200029
关键词[WOS]FORCE BALANCE ; NOZZLE ; DESIGN
WOS研究方向Engineering, Aerospace
WOS类目Engineering
项目资助者National Natural Science Foundation of China [11472281, 11532014] ; National Key Program of Research and Development [2016YFA0401200]
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力学所作者排名1
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文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/77884
专题高温气体动力学国家重点实验室
作者单位1.Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Meng BQ,Han GL,Luo ZT,et al. Numerical investigation of the axial impulse load during the startup in the shock tunnel[J]. AEROSPACE SCIENCE AND TECHNOLOGY,2018,73:332-342.
APA 孟宝清,韩桂来,罗长童,&姜宗林.(2018).Numerical investigation of the axial impulse load during the startup in the shock tunnel.AEROSPACE SCIENCE AND TECHNOLOGY,73,332-342.
MLA 孟宝清,et al."Numerical investigation of the axial impulse load during the startup in the shock tunnel".AEROSPACE SCIENCE AND TECHNOLOGY 73(2018):332-342.
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