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Second mode unstable disturbance measurement of hypersonic boundary layer on cone by wavelet transform
Han J; Jiang N(姜楠); Tian Y; Han, J (reprint author), Tianjin Univ, Dept Math, Tianjin 300072, Peoples R China
Source PublicationActa Mechanica Sinica
2011
Volume27Issue:4Pages:488-493
ISSN0567-7718
AbstractExperimental investigation of hypersonic boundary layer instability on a cone is performed at Mach number 6 in a hypersonic wind tunnel. Time series signals of instantaneous fluctuating surface-thermal-flux are measured by Pt-thin-film thermocouple temperature sensors mounted at 28 stations on the cone surface in the streamwise direction to investigate the development of the unstable disturbance. Wavelet transform is employed as a mathematical tool to obtain the multi-scale characteristics of fluctuating surface-thermal-flux both in the temporal and spectrum space. The conditional sampling algorithm using wavelet coefficient as an index is put forward to extract the unstable disturbance waveform from the fluctuating surface-thermal-flux signals. The generic waveform for the second mode unstable disturbance is obtained by a phase-averaging technique. The development of the unstable disturbance in the streamwise direction is assessed both in the temporal and spectrum space. Our study shows that the local unstable disturbance detection method based on wavelet transformation offers an alternative powerful tool in studying the hypersonic unstable mode of laminar-turbulent transition. It is demonstrated that, at hypersonic speeds, the dominant flow instability is the second mode, which governs the course of laminar-turbulent transition of sharp cone boundary layer.
KeywordHypersonic Boundary Layer Sharp Cone Instability Wavelet Transform Stability Transition Tunnel
Subject AreaEngineering ; Mechanics
DOI10.1007/s10409-011-0478-0
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000294494600003
WOS KeywordSTABILITY ; TRANSITION ; TUNNEL
WOS Research AreaEngineering ; Mechanics
WOS SubjectEngineering, Mechanical ; Mechanics
Funding OrganizationThe project was supported by the National Natural Science Foundation of China (10832001, 10872145), Opening subject of State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences.The authors gratefully acknowledge the China Aerodynamics Technique Research Academy for supporting the experiment and providing the experiment data.
Classification二类
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/44915
Collection非线性力学国家重点实验室
Corresponding AuthorHan, J (reprint author), Tianjin Univ, Dept Math, Tianjin 300072, Peoples R China
Recommended Citation
GB/T 7714
Han J,Jiang N,Tian Y,et al. Second mode unstable disturbance measurement of hypersonic boundary layer on cone by wavelet transform[J]. Acta Mechanica Sinica,2011,27(4):488-493.
APA Han J,姜楠,Tian Y,&Han, J .(2011).Second mode unstable disturbance measurement of hypersonic boundary layer on cone by wavelet transform.Acta Mechanica Sinica,27(4),488-493.
MLA Han J,et al."Second mode unstable disturbance measurement of hypersonic boundary layer on cone by wavelet transform".Acta Mechanica Sinica 27.4(2011):488-493.
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