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对强激波作用下双原子分子振动与离解耦合的非平衡离解过程进行了理论计算.本工作的特点是将计算起点建立在分子基本参数上,采用主方程理论处理振动与离解的耦合,振动跃迁几率用SSH理论计算,在离解限附近考虑多量子数跃迁并计及原子复合的影响.对O2-Ar体系,计算给出了在正激波后O2分子振动能级分布、振动弛豫时间、离解孕育时间、离解产物浓度、离解速率系数等物理量随时间的演化.计算结果分别与Camac和Wray的实验相符.计算显示,在激波作用的后期,有准稳态的振动能级布居分布.计算结果显示,Park模型低估了非平衡离解速率系数,Hansen模型则高估了非平衡离解速率系数.
A theoretical calculation is made on the non-equilibrium dissociation process of vibrational and dissociative coupling of diatomic molecules under the action of strong shock.The main work of this work is to establish the starting point of calculation on the basic parameters of molecules and to adopt the theory of master equations to deal with the coupling of vibration and dissociation, The probability of transition is calculated by SSH theory, considering the transition of multiple quantum number near the dissociation limit and taking into account the influence of atomic recombination. For the O2-Ar system, the distribution of vibrational energy level of O2 molecule after vibration is calculated. The vibration relaxation time , Dissociation and incubation time, concentration of dissociation products, coefficient of dissociation rate and other physical quantities evolve with time.The calculated results are in good agreement with the experiments of Camac and Wray respectively.The calculation shows that in the later stage of shock, there are quasi-steady vibrational levels The results show that Park model underestimates the rate of non-equilibrium dissociation rate and Hansen model overestimates the rate of non-equilibrium rate of dissociation.