Abstract: Usually thermodynamic and transportation parameters(such as ratio of specific heat,viscosity coefficient etc.)were treated as constants in numerical simulation of fluid of SFRJ.In fact,these parameters changed with local temperature, species etc.A simple but useful calculation model which determine thermodynamic and transportation parameters by equilibrium algorithm of thermodynamic species was presented.The results show that constant physical performance parameters can bring out considerable errors which illustrate that it is essential to consider the alternation of physical parameters at different area.

Key words: Solid fueled ramjet;Physics performance parameters +;Transporting coefficient +;Fluid dynamics;Computational fluid dynamics

摘要： 通常固体燃料冲压发动机内流流动过程的模拟计算中，热力参数及输运系数都视作常数， 实际上， 它们随当地温度、组分等的改变而在发生变化。为确定热力参数和输运系数在各个截面上的变化规律， 研究了热力组分的平衡算法， 提供了简单实用的计算模型。计算结果显示， 把物性参数视作常数会带来较大误差， 说明了考虑物性参数在各个截面上的变化是非常必要的

关键词: 固体燃料冲压发动机;物性参数~+;输运系数~+;流体动力学;计算流体力学