氧－氮混合气体在正激波后平衡态的数值模拟

Numerical Simulation of Equilibrium Normal Shock of Oxygen-Nitrogen Mixture Gas

对氧－氮混合气体在正激波后的平衡态进行了数值摸拟．用统计热力学方法中的配分函数计算化学反应平衡常数，考虑了气体组分的平动、转动、振动和电子能量，用多变量牛顿－莱卜生法求解控制方程组，在较宽的马赫数范围内得出了令人满意的结果．

Numerical Simulation of equilibrium normal shock of oxygen-nitrogen mixture acs is needed in the present stage of the design of Chinese shuttle.As published data on dctermination of chemical spedes and gas-dynamic parameters arc far from systematic, China must do independent work to satisfy Chinese needs.This paper presents research results that are not covered in existing Chinese papers such as that by Hu ct al of the authoritative China Aerodynamics Research Center[3].Well known principles of partition function are employed.For oxygen-nitrogen mixture gas,with the temperature in front of normal shock given as 300K,the results computed by the author are presented graphically.Figs.5 and 6 show,as Mach number varies from 3 to 25,the variations of tan chemical species;these are:O,N2,NO,O,N,O+,N+,NO+,O.N.The eleventh species is free electron.The density of free electron is the sum of all the five species in Fig.6.Fig.2 shows the variation of temperatore with Mach number.The results in Figs.5 and 6 show trends similar to those given in Re f.[4].The trend ac the curve in Fig.2 is similar to that of Rcf.[5].