考虑温度大范围变化的瞬态热固耦合方法研究

针对传统瞬态热固耦合方法不能准确反映温度大范围变化时传热与结构变形之间的耦合效应，基于Galerkin与Newmark算法，建立了充分考虑温度大范围变化对耦合项影响的瞬态热固耦合有限元计算方法。通过求解铝质薄板在强热流作用下的热响应问题，校验了该方法的正确性，并利用该方法对某型高超声速飞行器进气道热防护面板进行了瞬态热固耦合分析。利用理论公式证明并通过分析算例得出结论：温度剧烈变化对热固耦合问题的计算结果影响十分显著；考虑温度剧烈变化的耦合项对结构的温度场影响较小，但会使温度变化率呈现震荡状态，耦合项对结构的位移、变形速度及变形加速度有显著影响，对结构的振动起到阻尼作用。

Thermo-Mechanical Coupled Transient Response Approach Considering Wide Change in Temperature

To solve the problem of traditional methods for calculating transient thermo-mechanical coupled response, which cannot accurately reflect the coupled effect between heat transfer and structural deformation without considering a wide change in temperature, a transient finite element method for solving the thermo-solid coupled effect is established based on Galerkin and Newmark algorithms. The method fully considers a wide and rapid change in temperature for solving the thermo-mechanical coupling problem. By calculating the transient thermal response of an aluminum plate with a process of strong heat flow, the correctness of the method is proved. The results for solving the thermo-mechanical coupled problem of a thermal protection panel on the inlet of a hypersonic vehicle by use of this method show that the effect of a rapid change in temperature on calculated results of the transient thermo-mechanical coupled problem is significant; the impact of the coupled term considering dramatic change in temperature on the temperature field of the structure is small, but it induces the vibration of the rate of temperature change, and the coupled term also affects the displacement and the velocity and the acceleration of deformation of the structure significantly, and plays a damping role in the structural vibration.