强激光在超音速射流剪切层中传播的数值研究

以波长10 6μm、半径0 1m、强度166W的高功率CO2激光束穿过二维超音速自由射流剪切层流场为计算模型,研究了由于强激光束辐射加热对流场的干扰以及激光束穿过超音速射流剪切层后远场光强分布的变化。结果表明:在不同的马赫数下超音速射流剪切层流场对激光束远场强度分布影响明显不同,流场密度分布的微小变化都会使光束远场强度分布产生显见的不同;对于透过超音速射流流场的非聚焦的强激光束,由强激光束所产生的辐射加热对流场所造成的干扰可以忽略。

Numerical Study of Power Laser Passing Through the Supersonic Free Shear Layer

This paper is based on the discussion of the law of the interaction between the optic-field and fluid-field.The physical model is used which is high-energy laser beam to cross through the two dimension super-sonic free shot flow. It is discussed that the disturbance of the fluid-field caused by the radiation heating and the changing of laser beam's intensity after the beam passing through the fluid field and propagating a long distance in the steel atmosphere. The results show that there's a distinctness infection of fluid-field to the optic-field.In studying the interaction of high-speed fluid-field with high-energy laser, the radiation heating will be ignored.