Code development for air plasma flowfield with nonequilibrium atomic and molecular processes

建立了一个含时的碰撞辐射模型，研究了高焓流中非平衡原子和分子过程对粒子数密度的影响。研究了脉冲加热空气等离子体的非定常特性。当电离弛豫时间与加热脉冲的时间尺度处于同一量级时，非稳态电离的影响对于估计空气等离子体状态是重要的。通过在宽温度和密度范围内的参数计算，提出了等离子体内部态物理模型的适用条件。

A time-dependent collisional-radiative model for air plasma has been developed to study the effects of nonequilibrium atomic and molecular processes on the population density in high enthalpy flow. The unsteady nature of pulsively heated air plasma was investigated. When the ionization relaxation time is of the same order as the time scale of a heating pulse, the effects of unsteady ionization are important for estimating air plasma states. From parametric computations in wide temperature and density range, we suggested the appropriate conditions for physical models of plasma internal states.