Dynamics Evolution Investigation of Mack Mode Instability in a Hypersonic Boundary Layer by Bicoherence Spectrum Analysis

作     者：HAN Jian JIANG Nan 韩健;姜楠

作者机构：Department of MechanicsTianjin UniversityTianjin 300072 Department of MathematicsTianjin UniversityTianjin 300072 Tianjin Key Laboratory of Modern Engineering MechanicsTianjin 300072 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2012年第29卷第7期

页      面：171-174页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Supported by the National Natural Science Foundation of China under Grant No 10832001 the Opening Subject of State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences 

主　　题：transition laminar turbulent 

摘      要：The instability of a hypersonic boundary layer on a cone is investigated by bicoherence spectrum *** experiment is conducted at Mach number 6 in a hypersonic wind *** 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 along streamwise direction to investigate the development of the unstable *** bicoherence spectrum analysis based on wavelet transform is employed to investigate the nonlinear interactions of the instability of Mack modes in hypersonic laminar boundary layer *** results show that wavelet bicoherence is a powerful tool in studying the unstable mode nonlinear interaction of hypersonic laminar-turbulent *** first mode instability gives rise to frequency shifts to higher unstable modes at the early stage of hypersonic laminar-turbulent *** modulations subsequently lead to the second mode instability *** second mode instability governs the last stage of instability and final breakdown to turbulence with multi-scale disturbances growth.