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采用内置高温热管的疏导式热防护结构是一种新型高效的热防护方式,热管与高温复合材料之间的接触热阻(TCR)对防热效果有重大的影响。首先给出了一种疏导式热防护结构的计算模型,进而采用间接耦合的方法建立了由接触热阻引起的热力耦合问题的计算格式,在此基础上对不同预留间隙条件下的热防护结构进行了热力耦合分析,重点考察了接触热阻对其防热效果的影响。研究结果表明,采用预留装配间隙的方法可以有效降低结构的应力水平,但同时使得界面接触热阻增加,从而使得结构驻点温度升高,因此在采用预留间隙设计时必须在考虑界面接触热阻的条件下从结构强度和温度两方面对结构进行安全性评估。
Dredge-type thermal protection with built-in high-temperature heat pipes is a new and efficient thermal protection method. The TCR between heat pipes and high-temperature composite materials has a significant impact on the thermal protection. Firstly, a computational model of the divergent thermal protection structure is given, and then an indirect coupling method is used to establish the thermal coupling problem caused by the contact thermal resistance. Based on this, the thermal protection under different clearance conditions Structure of the thermal coupling analysis, focusing on the contact thermal resistance of its thermal effects. The results show that the use of pre-assembly clearance method can effectively reduce the structural stress level, but at the same time make the interface contact thermal resistance increases, so that the structure stagnation point temperature rise, so when using the design of the gap must be considered in the interface contact Thermal resistance of the structure from both structural strength and temperature of the safety assessment of the structure.