高超声速飞行器高温流场对激光武器毁伤效应的影响
Effects of high temperature flowfields around hypersonic air vehicles on laser lethality
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摘要: 以美国ABL系统激光武器为例，分析了高超声速飞行器高温流场气体影响激光武器毁伤效应的一些主要因素，包括气体击穿、等离子体屏蔽效应、烧蚀产物颗粒的影响。结果表明：通常情况下，流场电子数密度小于1017 cm-3，流场本身等离子体特性不会引起对激光的等离子体屏蔽效应；只有在0.5 km射程以内和宽脉冲激光引起的高压流场（约10 MPa以上）气体击穿，才会导致明显的等离子体屏蔽效应，但在实际战场条件下这种情况一般不会发生；对采用烧蚀手段进行防热的飞行器而言，飞行高度大于10 km，并且基于自由来流流量的无量纲化烧蚀流量小于10-2左右时，烧蚀产物颗粒不会引起激光的衰减。Abstract: The effects of high temperature flowfields around hypersonic air vehicles on laser lethality have been analysed in the case of the American Airborne Laser(ABL) system, including the effects of gas breakdown, plasma shielding and ablation smoke absorption. It is shown that, the electron number density in flowfields is generally less than 1017 cm-3 which can not result in plasma shielding. The plasma shielding of high pressure flowfields (above around 10 MPa) may be obvious only within the transmission distance of 0.5 km and only for broad pulse duration which may rarely happen in battlefield. The ablation products can not result in extinction to laser emission when the ablation mass flux nondimensioned by free stream flux is less than around 10-2 and the fli
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Key words:
- hypersonic air vehicle /
- high temperature flowfields /
- gas breakdown /
- plasma shielding /
- ablation
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