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针对高超声速飞行器气动热环境的化学非平衡效应进行数值模拟.首先以二维圆柱钝体为模型,采用三种气体模型比较和分析化学非平衡效应对气动特性和气动加热特性的影响;接着以三维球头钝体为模型,进一步分析化学非平衡效应及壁面催化特性对气动加热特性的影响.分析表明,化学非平衡效应对压力分布的影响不大;但它能显著缩短激波脱体距离,更重要的是,能大幅降低波后温度,对飞行器气动热环境产生深远影响.另外,壁面催化特性对传热也有较大的影响,对壁面材料催化进程的有效控制可以大幅降低壁面传热.
A numerical simulation of the chemical non-equilibrium effect of aerodynamic thermal environment of hypersonic vehicle is carried out.Firstly, the two-dimensional cylindrical bluff body is taken as the model and three gas models are used to compare and analyze the influence of chemical unbalanced effect on aerodynamic characteristics and aerodynamic heating characteristics. Dimensional ball-head bluff body as a model to further analyze the effect of chemical unbalanced effect and wall catalysis on the characteristics of aerodynamic heating.The analysis shows that chemical unbalanced effect has little effect on pressure distribution, but it can significantly shorten the shock off-body distance , More importantly, can greatly reduce the wave temperature, the aircraft aerodynamic thermal environment has a profound impact.In addition, the wall catalytic properties have a greater impact on heat transfer, the wall material catalytic process can effectively reduce the wall heat transfer .