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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
In the simulation of the internal flow of solid fuel ramjet engines, both the thermal parameters and the transport coefficients are considered as constants. In fact, they change as the local temperature, composition, etc. change. In order to determine the variation law of thermal parameters and transport coefficients in each section, the balance algorithm of thermodynamic components was studied and a simple and practical calculation model was provided. The calculation results show that it is very necessary to consider the change of physical parameters in every section considering the physical parameter as a constant.