| 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
|
| 发表期刊 | Acta Mechanica Sinica
 |
| 2011
|
| 卷号 | 27期号:4页码:488-493 |
| ISSN | 0567-7718
|
| 摘要 | Experimental 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. |
| 关键词 | Hypersonic Boundary Layer
Sharp Cone
Instability
Wavelet Transform
Stability
Transition
Tunnel
|
| 学科领域 | Engineering
; Mechanics
|
| DOI | 10.1007/s10409-011-0478-0
|
| URL | 查看原文
|
| 收录类别 | SCI
; EI
|
| 语种 | 英语
|
| WOS记录号 | WOS:000294494600003
|
| 关键词[WOS] | STABILITY
; TRANSITION
; TUNNEL
|
| WOS研究方向 | Engineering
; Mechanics
|
| WOS类目 | Engineering, Mechanical
; Mechanics
|
| 项目资助者 | The 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.
|
| 论文分区 | 二类
|
| 引用统计 |
|
| 文献类型 | 期刊论文
|
| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/44915
|
| 专题 | 非线性力学国家重点实验室
|
| 通讯作者 | Han, J (reprint author), Tianjin Univ, Dept Math, Tianjin 300072, Peoples R China |
推荐引用方式
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.
|
修改评论