分离式陶瓷基高温热疏导系统的耦合传热特性

对采用高温陶瓷基复合材料的高超声速飞行器分离式热疏导系统，建立了气动加热下 ，高、低热流区材料内导热－辐射与疏导通道内对流换热的耦合传热模型。采用控制容积法 结合蒙特卡罗法计算两区域陶瓷基复合材料内的导热－辐射换热，并与热疏导通道热平衡方 程耦合求解。通过模拟计算，分析了气动加热热流比、辐射散热面积比、材料光学厚度、导 热－辐射参数、对流－辐射参数对热疏导系统传热性能的影响。初步获得了提高分离式热疏 导系统传热性能的各参数调节规律。

Coupled Heat Transfer in High Temperature Separated Heat Transporting System of Ceramic Matrix Composites

The coupled heat transfer model of separated heat transporting system with high temperature ceramic matrix composites was developed. The system is applied to protect hypersonic vehicle from aeroheating. Thermal process in it consists of the conduction coupled with radiation in the composite of high flux region of aeroheating and that in the composite of low flux region as well as the convective heat transfer in the transporting channel. The control volume method was combined with the Monte Carlo method to calculate the conduction-radiation heat transfer in the ceramic matrix composites of the two regions, and the thermal equilibrium equation for the transporting channel was solved simultaneously. The effects of those on the heat transfer in the heat transporting system were analyzed, which are the aeroheating flux ratio, the area ratio of radiative surfaces, the optical thickness and conduction-radiation parameter of composites, and the convection-radiation parameter. From the results analysis, some knowledge on the varying discipline of those parameters was obtained to enhance the heat transfer performance of the system.