空气动力学学报2025，Vol.43Issue(2)：75-85,11.DOI:10.7638/kqdlxxb-2024.0096
高速升力体非对称流向涡不稳定性研究
Study on the linear instability of asymmetric streamwise vortices over a high-speed lifting body
摘要
Abstract
The two-dimensional global stability analysis method(BiGlobal)was employed to investigate the instability characteristics of asymmetric streamwise vortex structures at the waist of a hypersonic transition research vehicle(HyTRV),with parameters set as model length 1 600 mm,0°angle of attack,freestream Mach number 6,unit Reynolds number 1.0×107/m,and static temperature 79 K.The laminar base flow field was obtained through direct numerical simulation by a high-order finite difference method under an isothermal wall condition(300 K).The results indicate that low-velocity fluids near the top of the upper surface and along the long axis of the lower surface converge at the waist,forming streamwise vortices.The pressure gradient disparity between the two sides leads to asymmetric development of these vortices,with the one on the lower side exhibiting more pronounced curling.Stability analysis reveals that the unstable modes of asymmetric streamwise vortices at the lifting body's waist can be categorized into inner modes,outer modes,and Mack modes,aligning with previous research findings.The inner modes are primarily influenced by spanwise velocity shear,whereas the outer modes are predominantly affected by normal velocity shear.The disturbance shape functions are primarily distributed on the side where the streamwise vortex exhibits stronger curling,which is different from the traditional symmetrical streamwise vortex.Utilizing the eNmethod based on global stability analysis,it is concluded that the N factor of the Mack mode is higher in the upstream region.This suggests that the Mack mode is more likely to initiate transition in a noisy environment.Conversely,the N factor of the outer mode is more pronounced in the downstream region,indicating a higher potential for transition in a quiet environment.关键词
HyTRV/升力体/全局稳定性分析/非对称流向涡/eNKey words
HyTRV/lifting body/global stability analysis/asymmetry streamwise vortex/eN引用本文复制引用
张彬,李晓虎,涂国华,陈坚强..高速升力体非对称流向涡不稳定性研究[J].空气动力学学报,2025,43(2):75-85,11.基金项目
国家自然科学基金(92052301) （92052301）
