一种基于激光驱动的飞片动能利用效率计算方法

Computational Method of Flyer Plates Kinetic Energy Efficiency Based on Laser Driving

努力提高飞片动能利用效率对于减小激光起爆系统装置体积、重量,实现系统小型化具有直接现实意义。本文根据激光诱导爆轰波(LSDW)理论,分析激光与飞片作用产生爆轰波压力的时间和空间分布情况,推导激光驱动飞片动能利用效率的数学表达式。以铝飞片为例,重点分析了激光参数(功率密度、脉宽、焦斑直径)和飞片结构参数(厚度、直径)对飞片动能利用效率的影响。计算结果表明:飞片动能利用效率与激光的脉宽和飞片直径成正比关系,而与聚焦光斑、功率密度以及飞片的厚度成反比关系。

With regard to decreasing the volume and weight of laser ignition system, it is practically significant to realize system miniaturization by utilizing efficiently kinetic energy of flyer plate. According to Laser Supported Detonation Wave （LSDW） theory, the time and space distributions of detonation-wave pressure of flyer plates supported by laser are analyzed. Then flyer plates kinetic energy efficient equation is deduced. Finally, Taking aluminium flyer plates as an example, the influences of the laser parameters （such as power density, pulse width, and focus spot diameter） and flyer structure parameters （such as flyer thickness, diameter） on kinetic energy efficient are analyzed. The computational results show that flyer plates kinetic energy efficiency has direct ratio to laser pulse width and flyer plates diameter, whereas has inverse ratio to focus spot, power density and flyer plates thickness .