空气动力学学报2025，Vol.43Issue(11)：56-65,10.DOI:10.7638/kqdlxxb-2024.0152
再入轨道下的高焓稳定性分析及电离的影响
Stability analysis of high-enthalpy boundary layers during reentry and the effects of ionization
摘要
Abstract
The laminar-to-turbulent transition of boundary layers is crucial for the aerodynamic and aerothermal design of high-speed vehicles as it results in a significant increase in skin friction and wall heat flux.In high-enthalpy boundary layers,the transition process becomes even more intricate due to various thermo-chemical processes induced by the extremely high temperature.This study employs chemical non-equilibrium linear stability analysis with 5-species and 11-species atmospheric models to investigate blunt cone boundary layers under reentry conditions,focusing on the effects of Mach number and ionization on the boundary-layer stability.The results indicate that the transport coefficients of ionized air calculated using the Gupta-Wilke(GW)model exhibit significant errors.In contrast,the results of the GW model without considering electrons are more aligned with those of the Chapman-Enskog(CE)model.Under flight conditions,as the Mach number increases,the growth rate of the second mode decreases gradually,while the instability frequency range broadens.Ionization primarily affects the base flow near the nose.Specifically,ionization at the nose slightly reduces the growth rate of the second mode upstream but does not alter the overall N-factor,thereby having a negligible effect on the aircraft's transition prediction.Additionally,the computational efficiency of real-gas transition predictions can be improved by using a five-species model.关键词
高焓边界层/流动稳定性/化学非平衡流动/真实气体效应Key words
high-enthalpy boundary layer/flow stability/chemical non-equilibrium flow/real-gas effects分类
数理科学引用本文复制引用
LU Ruiyang,HUANG Zhangfeng..再入轨道下的高焓稳定性分析及电离的影响[J].空气动力学学报,2025,43(11):56-65,10.基金项目
国家自然科学基金(92271102) （92271102）
