流过泰氟龙烧蚀表面的化学非平衡边界层数值研究

对流过泰氟龙烧蚀表面的化学非平衡边界层进行了数值分析．研究了气体模型、化学反应速率常数和壁画催化对边界层特性的影响．研究表明，气体模型对烧蚀产物组元浓度大小的排序有很大影响，但不同气体模型造成的电子数密度差最大仅一个数量级；不同的氟碳反应速率常数，虽在非催化壁条件下，对组元浓度剖面有强烈影响，但对电子数密度剖面，不管壁面催化特性如何，几乎都没有影响；表面烧蚀可能引起边界层分离．

NUMERICAL RESEARCH ON NONEQUILIBRIUM CHEMISTRY BOUNDARY LAERS OVER ABLATING TEFLON SURFACES

The chemically nonequilibrium boundary layers over ablating Teflon surface are numerically analysed.The effects of the gas models,the reaction rate constants and the wall catalysis on boundary layer properties are investigated.The results indicate that:the gas models have strong effects on the magnitude sequence of the species concentrations but the maximum difference of electron densities between the two models is only of one order of magnitude; the different floarocarbon reaction rate constants have much more stronger effects on the species concentration profiles while the ablating surfaces are noncatalytic but there is almost no difference between the two electron density profiles obtained from two sets of reaction rate data in spite of different wall catalysis;the surface ablation might induce separation of boundary layers.