高超声速环境D6AC钢结构多物理场耦合模拟

Multi-physics coupling simulation of D6AC steel structure in hypersonic environment

摘要:

为探究热防护材料在高超声速环境下的服役行为,采用风洞试验和数值模拟方法研究了D6AC钢结构在多物理场耦合作用下的失效问题. 基于高超声速气动力学、结构力学基本理论,建立高超声速D6AC钢结构的多物理场耦合理论模型,利用Navier-Stokes方程模拟得到其在不同飞行环境下的气动加热和结构响应,并对数值模拟的结果进行风洞试验验证. 结果表明,风洞试验结果与数值模拟结果相吻合. 气动热是导致D6AC钢结构破坏的主要因素,在三组来流条件下钢结构均发生了烧蚀现象,结构烧蚀开始时间取决于来流总温的大小.

Abstract:

To explore the service behavior of thermal protection materials in hypersonic environments, wind tunnel experiments and numerical simulation methods are used to investigate the failure of D6AC steel structure under multi-physics coupling. Based on the basic theory of hypersonic aerodynamics and structural mechanics, the multi-physics coupling theory model of hypersonic D6AC steel structure is established. The aerodynamic heating and structural response in different flight environments are obtained by N-S equation simulation, and the results of numerical simulation are verified in wind tunnel test. The aerodynamic heat is the main factor leading to the failure of D6AC steel structure. Under three different flow conditions, the ablation phenomenon occurs in the steel structure, and the starting time of the structure ablation depends on the total temperature of the incoming flow.