多原子气体强蒸发的半经验边界条件
Semi-empirical boundary conditions for strong evaporation of a polyatomic gas
摘要：
本文提出了一种获得多原子气体在平面上强蒸发边界条件的半经验方法。该程序是基于指定的依赖性的特定的动量和焓的流量从气体流速。后者是通过分析有关多原子和单原子气体蒸发的现有数据得出的。该方法准确地预测了流动的声速终极速度，并对跨声速区现有的边界条件进行了修正。因此，对于j = 2和音速流，压力、温度和背散射分子分数的修正约为0.7%、-3%和-8%。
英文摘要：
Semi-empirical procedure of obtaining the boundary conditions for strong evaporation of a polyatomic gas from a plane surface is proposed. The procedure is based on specifying the dependencies of specific momentum and enthalpy of the flow from the gas flow rate. The latter are derived from the analysis of the available data concerning the evaporation of polyatomic and monatomic gases. The procedure predicts the exactly sonic terminal velocity of the flow and leads to some corrections of existing boundary conditions in transonic region. Thus, for j = 2 and sonic flow the corrections for pressure, temperature and fraction of back-scattered molecules are about 0.7%, -3% and -8%.
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