高焓化学非平衡流条件下防热材料表面催化特性的试验方法

摘要

通过对高焓化学非平衡流场参数高精度重构和试样表面参数测试方法的研究,在1 MW高频等离子体风洞上建立了防热材料(Thermal Protection Materials,TPMs)表面催化特性测试的试验方法.应用该方法研究了二氧化硅材料在驻点压力分别为2.7、5和10 kPa,焓值为13.9～21.9 MJ/kg的高焓离解空气环境下,表面温度为1 563～2 003 K范围内的表面催化反应复合效率随表面温度和原子压力的变化关系.对比国外文献,该试验结果与国外研究结果一致,表明该试验方法是正确、可靠的.同时,高焓化学非平衡流条件下防热材料表面催化特性试验方法的确立将为高超声速飞行器热防护系统的优化设计和新型防热材料性能改进提供有力的技术支撑.%The method for determining the surface catalytic recombination coefficients of Thermal Protection Materials (TPMs) in high enthalpy dissociated flows is established on 1 MW high frequency plasma wind tunnel according to the research development in diagnostics of high enthalpy chemical non-equilibrium flow and surface parameter determination of TPMs.This paper presents the catalytic recombination coefficient of SiC2,with surface temperature being 1 563-2 003 K,enthalpy being 13.9-21.9 MJ/kg,and stagnation point pressure being 2.7,5 and 10 kPa.The test results agree well with foreign literatures,indicating reliability of the method for determination of catalytic recombination coefficient.The method proposed can provide support for precise prediction of aerodynamic heat environment and more accurate design of TPMs.