超声速气流下强激光辐照靶体失效数值模拟

建立了能够反映激光、流场和结构相互作用的热流固耦合数值计算方法，用于模拟超声速气流（马赫数1.2~4.0）作用下强激光辐照靶体结构的失效行为。分析了不同耦合策略对数值计算结果的影响。研究了激光功率密度及来流马赫数对屈服失效和熔融失效行为的影响。结果表明:激光功率密度对失效辐照时间影响显著；存在一个临界马赫数，使得达到屈服失效和熔融失效的辐照时间最长。通过定量分析激光辐照下不同马赫数的气动生热、散热及能量分配，解释了临界马赫数存在的机理。

Numerical simulation of failure of target irradiated by high-power laser subjected to supersonic airflow

A preliminary coupled thermal-fluid-structure numerical method which reflects interaction of laser, airflow and target is presented, in order to investigate failure behavior of the target irradiated by high-power laser subjected to supersonic airflow (at Mach number 1.2-4.0). The influences of different coupling methods on the target temperature are investigated. Also, the influences of laser power density and airflow velocity on the failure behavior of the irradiated target are investigated, where irradiation times to reach the yield failure and melting failure are the main concern. Results show that, laser power density significantly affects the failure behavior; there is a critical Mach number at which irradiation times to reach yield failure and melting failure are the longest. By quantitatively evaluating the aerodynamic heating, aerodynamic cooling and energy distribution for different Mach numbers, we explain the mechanism for the critical Mach number.