钝体头部热化学非平衡效应的CFD与DSMC仿真分析  

CFD and DSMC Simulations of Thermochemical Non-equilibrium Effects in Blunt Bodies

作　　者：任翔 袁军娅[1] 蔡国飙[1] Ren Xiang;Yuan Jun-ya;Cai Guo-biao(Beihang University,Beijing,100191)

机构地区：[1]北京航空航天大学,北京100191

出　　处：《导弹与航天运载技术（中英文）》2022年第6期123-127,共5页Missiles and Space Vehicles

基　　金：国家自然科学基金面上项目(51676010)。

摘　　要：大气层中的高速飞行往往伴随着强烈的热化学非平衡效应,并对飞行器头部产生强烈的气动加热效应。使用可描述内能松弛和化学反应过程的CFD和DSMC方法分别对圆柱体开展不同来流速度的数值仿真,对比分析热化学非平衡效应对流场参数和气动热的影响。结果表明:在稀薄来流条件下,来流速度越大,分子内能的激发与离解过程会对气动热的准确预测影响越显著;在充分考虑热化学非平衡过程时,热流系数随来流速度的增大呈现先增后减再增的变化规律。High-speed flight in air are often accompanied by strong thermochemical non-equilibrium effects and strong aerodynamic heating of the vehicle head.CFD and DSMC methods,which can describe the internal energy relaxation and chemical reaction processes,are used to numerically simulate the cylinder with different incoming flow velocities to compare and analyze the effects of the thermochemical non-equilibrium effect on the flow field parameters and aerodynamic heating.The results show that the atmospheric molecules'internal energy excitation and dissociation processes have a significant impact on the accurate prediction of the aerodynamic heat as the incoming flow velocity increases under thin freestream flow conditions.

关 键 词：高速飞行 热化学非平衡 气动热 DSMC方法 

分 类 号：V411.3[航空宇航科学与技术—航空宇航推进理论与工程]