激光金属复合汽化汽离混合区的状态参量及影响因素分析

The analysis of state parameter and influencing factor of the area that steam and ion mix about metal become compound steam melt by laser

分析了中强度激光作用下混合区对激光的吸收系数;求出了汽离混合区激光强度的时空分布;利用强度的时空分布和流体力学方程,近似的求得了混合区的约化密度、约化压强和速度分布,结果发现:①汽离混合区各处的约化密度和约化压强随时间成周期性分布,随位置坐标成指数规律增加,不同时刻的指数规律成周期性交替变化,随辐照激光波长成变周期性增加的变化;②"离子"喷射速度随位置坐标成线性分布关系;③各处的速度随波长成指数规律降低,不同位置的指数规律相近,但速度变化不大.

The absorption coefficient of mix area for laser had been analyzed under middling strength laser; the space-time distribution of laser strength had been given in the area of steam and ion mix;distribution of brief density and brief pressure and speed approximate had been given through the space-time distribution of laser strength and hydromechanics equation have used, then the results are： （1）brief density and brief pressure is periodically with time in any place, it＇s index law with coordinate to increase in any time; the index law changes periodically across at not identical time; it＇s changes periodically increase with laser wavelength in any place of the area of steam and ion mix; （2） speed of ＂ion＂ spurt is linear distribution relation with location ; and （3）speed of any place of the area of steam and ion mix is reduced with the index law according to the wavelength; if it＇s index law is close at not identical location, the speed change is not large.