接触热阻对超声速飞行器结构响应分析的影响

在超声速飞行中,界面间接触热阻对结构传热有重要的影响。在超声速飞行器设计与安全评估中,需要准确判断接触热阻对结构响应的影响。为此,形成考虑接触问题的热力直接耦合有限元计算方法,建立了超声速飞行器前缘结构局部模型,通过CMY(Copper-Mikic-Yovanovich)模型获得了界面间接触热阻,计算了超声速飞行中考虑与不考虑接触热阻时飞行器前缘的结构响应。结果表明:在仿真中考虑接触热阻大幅改变了结构的温度与应力响应,并增强了温度场与应力场间的双向耦合关系。同时,载荷大小决定了接触热阻对结构应力场的影响程度。

Effects of Thermal Contact Resistance on Structural Responses of Supersonic Aircraft in Numerical Simulation

In supersonic flight, the thermal contact resistance between interfaces has an important effect on the heat transfer of structures. It is necessary to accurately evaluate the influence of thermal contact resistance on structural responses, in the design and safety assessment of supersonic vehicle. So, a direct coupled thermo-mechanical finite element method considering interfaces contact was formed, a local model of supersonic civil aircraft leading edge structure was established, the thermal contact resistance of interfaces was obtained with the CMY model, and the structural response of leading edge with or without thermal contact resistance in the supersonic flight was simulated. As the result of simulation, the temperature and stress response of the structure are greatly changed with considering thermal contact resistance in numerical simulation, and the bidirectional coupling relationship between temperature field and stress field is enhanced. At the same time, the magnitude of load determines the degree of influence of thermal contact resistance on the stress field of the structure.