自由旋涡气动窗口设计以及全流场数值模拟

Numerical simulation of the overall flow and design of the free- vortex aerodynamic window

为了解决低腔压大功率气体激光器传统固体输出窗口的热吸收问题,多采用自由旋涡气动窗口替代传统固体输出镜的方法。通常,自由旋涡气动窗口的设计采用无粘特征线方法结合经验修正,扩压段的设计采用理论分析结合经验的方法。基于对气动窗口整个流场的数值模拟来设计气动窗口的研究还不太完善,利用超声速自由旋涡流动结构并结合数值模拟的方法,设计了自由旋涡气动窗口,用数值模拟的方法得到了较理想的扩压段宽度和位置,最后对气动窗口全流场进行了模拟,结果表明自由旋涡气动窗口的设计是可行的。

To solve the problem of the fractional of the laser energy absorption in solid output windows of conventional gas lasers, the free-vortex aerodynamic window is designed based on the aerodynamic theory and numerical simulation, The position and width of the diffuser＇s intake are studied by means of numerical simulation of the overall flow field in this paper. The appropriate width and position are obtained. At last, the overall flow of the free-vortex aerodynamic window is calculated and discussed using the finite element method, the calculation results show that the design is reasonable.