实验流体力学2025，Vol.39Issue(3)：32-41,10.DOI:10.11729/syltlx20250048
壁温和声阻抗边界对高焓边界层稳定性影响
Effects of wall temperature and acoustic impedance surface on stability of high enthalpy boundary layer
温景浩 1万兵兵 1涂国华 1张锐 1李晨辉2
作者信息
- 1. 空天飞行空气动力科学与技术全国重点实验室,绵阳 621000
- 2. 空天飞行空气动力科学与技术全国重点实验室,绵阳 621000||北京航空航天大学 航空科学与工程学院,北京 100191
- 折叠
摘要
Abstract
The transition of the boundary layer from laminar flow to turbulence poses a serious challenge to the design of high-speed aircraft.The chemical non-equilibrium processes in the high-speed boundary layer flow make its instability mechanism more complicated,and the under-standing of the fundamental mechanism need to be strenghthened.This work investigates the effects of different wall temperatures and acoustic impedance boundaries on the flow stability using the linear stability analysis method with high-temperature chemical nonequilibrium and acoustic impedance surface taken into account.Research has found that compared to the calorically perfect gas,the high-temperature chemical non-equilibrium effect at the same wall temperature makes the dominant mode more unstable but has a smaller impact on the frequency of the peak mode.In the high enthalpy flow,wall cooling promotes the instability of the second and third modes,which can affect the mode synchronization process in the boundary layer more prominently than the chemical non-equilibrium effect,thus causing the corresponding frequency of the most unstable mode to move to the high frequency.Both the microgrooves and micropores on wall surfaces can significantly inhibit the second and third modes,but the difference between their effects decreases with the rise of wall temperature.关键词
流动稳定性/化学非平衡/声阻抗边界Key words
flow stability/chemical non-equilibrium/acoustic impedance surface分类
数理科学引用本文复制引用
温景浩,万兵兵,涂国华,张锐,李晨辉..壁温和声阻抗边界对高焓边界层稳定性影响[J].实验流体力学,2025,39(3):32-41,10.
