圆柱界面高温接触热阻模型及其减阻方法研究

Cylindrical high temperature thermal contact resistance is the key factor of the heat-pipe-cooled thermal protection method, and is not only the research highlights in the academic community, but also an urgent requirement in the development of heat-pipe-cooled thermal protection structure of our nation. The present proposal origins from the major strategic requirements, and combines solid mechanics, computational mechanics, heat transfer and material science, to develop a test facility for cylindrical high temperature thermal contact resistance, and the cylindrical thermal contact resistance for material pair with potential application in near space hypersonic vehicle will be experimentally investigated with this facility. Meanwhile, the nonlinear cylindrical interface high temperature thermal contact resistance model is developed with thermo-mechanical coupling effect, based on macro-micro geometrical characterization, mechanical computation and thermal analysis. With the multi-scale approximation of the micro morphology of the interface, a multi-scale thermal-structure numerical simulation approach for high temperature thermal contact resistance is also developed. At the same time, the comparative study of the reduction effect of the thermal contact resistance between soft heat-resisting interface material and low melting point alloy interface material will be conducted. At last, a comprehensive experimentally verified cylindrical interface high temperature thermal contact resistance model and its reduction method will be developed. Results obtained with the present proposal can be an important reference for the design and safety evaluation of heat-pipe-cooled thermal protection structures of near space hypersonic aircraft.

圆柱界面高温接触热阻是影响疏导式热防护结构防热效果的关键因素，不仅是当前国内外学术研究的前沿热点，也是我国疏导式热防护结构设计开发的迫切需要。本项目从当前国家的重大战略需求出发，交叉融合固体力学、计算力学、传热学、材料学等多学科，研制一套可用于圆柱界面高温接触热阻研究的测试装置，进而针对近空间高超音速飞行器疏导式热防护结构可能采用的材料组合间的圆柱界面高温接触热阻进行试验研究。并从宏微观几何表征、力学计算和热学分析入手，建立考虑热力耦合的非线性圆柱界面高温接触热阻理论模型及多尺度热-结构耦合数值仿真方法，比较研究柔性耐热间隙填料和低熔点合金填料的减阻效果。最终，发展深入全面的经试验验证的圆柱界面高温接触热阻模型及其减阻方法，为近空间飞行器疏导式热防护结构的设计及安全评估提供技术支撑。

接触热阻是影响热防护结构防热效率的一个重要因素，接触热阻的准确定量表征是热防护结构优化设计和安全评估的重要基础。本项目从当前国家的重大战略需求出发，交叉融合固体力学、计算力学、传热学、材料学等多学科，针对多功能一体化热防护结构，搭建了基于国产试验机和高温设备的高温接触热阻试验平台，建立了高温接触热阻的微观有限元模型，并对材料、几何、边界条件、间隙填料等多种因素对接触热阻模型及减阻效果的影响进行了研究，发展了高温接触热阻的理论模型，揭示了接触热阻相关的热结构的热整流机制，提出了预留间隙的热整流调控新思路。与此同时，从多功能一体化思想出发，从理论建模、数值仿真和实验验证多角度出发研究了新型压电振动俘能器的俘能机制和俘能效率，提出了利用充液容器的晃动来调谐俘能器动力学响应的新方法，有效拓展了俘能器的俘能带宽。以上创新性研究成果为我国新型多功能一体化疏导式热防护结构的优化设计及安全评估提供了重要的理论支撑和技术储备。