含液体金属复合壳体结构的抗强激光特性及其数值模拟

Anti-laser Characteristics of Hybrid Shell Structure with Liquid Metal Layer and Its Numerical Simulation

热烧蚀破坏是激光辐照过程中最常见且最易发生的现象。为防御激光辐照对壳体的热烧蚀破坏,以现有防护结构为基础提出了一种含液体金属的复合壳体结构,通过在壳体防护结构中设置一种能在常温下处于液体状态的金属材料,借助液体金属材料良好的导热特性及流动性能,在激光辐照时将光斑辐射部位所积聚的大量能量快速疏散,从而达到防护激光武器的目的。为明晰这种含液体金属复合壳体结构的抗激光性能,建立了相应的三维模型,并对其中典型的抗激光辐照过程进行了数值模拟和分析。结果表明,此方法可有效降低激光光斑照射表面的温度,从而延缓壳体发生软化的过程,由此还可实现更强大的抵御激光辐照的能力。新方法可进一步推广至各式反激光防护体系中。

In order to avoid the thermal ablation destruction induced by the laser weapon,a thin layer of liquid metal is sandwiched into the hybrid structure shell.The unique merit of this hybrid structure lies in the excellent characteristics of liquid metal in thermal conductivity and flow to rapidly dissipate the thermal energy accumulated at the radiation spot.To evaluate and understand the practicability of this defensive measure against the intense laser,a comprehensive investigation on the suitability of using liquid metal is performed to sustain the thermal ablation damage.Numerical simulations are performed on three-dimensional heat transfer problems in the composite structure embedded with liquid metal.It is found that the new method can effectively reduce the temperature at the shell surface,which subsequently delays the softening process,and then achieves a powerful ability to withstand the intense laser.The strategy is expected to be useful in a variety of anti-laser systems.