内置高导C/C材料的疏导式热防护结构防热效果

本文建立了内置高导C/C材料的疏导式热防护结构原理模型,通过实验的方法给出了高导C/C材料与耐热三维编织C/C材料间的接触热阻,并利用数值仿真针对影响结构热防护效果的若干关键参数进行了参数影响研究.研究结果表明:减小耐热层厚度是一种降低驻点温度的有效方法,但是必须同时考虑由此引起的强度问题;界面接触热阻对热防护效果影响很大,必须通过工艺处理降低界面热阻才能实现有效的热防护.

Thermal protection effect of heat-pipe-cooled thermal protection structures with embedded high thermal conductivity C/C materials

Heat-pipe-cooled thermal protection is an effective thermal protection method with embedded high heat transfer capacity materials or structures. A numerical model of a heat-pipe-cooled thermal protection structure with an embedded high thermal conduc-tivity C/C material was proposed in the present paper. Contact thermal resistance was tested between the high thermal conductivity C/C material and the heat-resisting three-dimensional braid C/C material. The effects of several key parameters on the thermal protection results were also numerically investigated. The results show that it is an effective method to decrease the stagnation temperature by reducing the thickness of the heat-resisting material, but the resulting strength problem should also be taken into account. Interface contact thermal resistance has a significant influence on the thermal protection effect, and in order to achieve effective thermal protection the interface contact thermal resistance should be lowered through fabrication processing.