超声速自由涡气动窗口剪切层光学性能的优化设计研究

The optimization study of optical performance of shear layer in free-vortex ADW

在超声速自由旋涡气动窗口应用中,高能激光束实际上是透过超声速自由旋涡射流的剪切层输出的,激光束会受到剪切层的退化畸变。为了减少这种畸变,优化超声速剪切层光学性能,提出了超声速自由旋涡射流的压力匹配和折射率匹配剪切层的设计方法。提出了两种类型的折射率匹配剪切层的设计方法,讨论了其设计过程。这两种剪切层分别为按照某种比例混合的He/Ar混合气体作为自由旋涡射流的工作气体时的折射率匹配剪切层,以及选用加热到某个温度的干燥空气作为自由旋涡射流工作气体时的折射率匹配剪切层。

In supersonic free-vortex aerodynamic window (ADW), high-energy laser beam is exactly output through a shear layer of supersonic free-vortex jet, and the laser beam is interfered by shear layer. In order to optimize optic performance of supersonic shear layer, the design method of the pressure matched and refractive index matched shear layer is put out in designing supersonic free vortex aerodynamics window. Two types of refractive index matched method are realized, one is to use He/Ar blend gases with given ratio as working gas in free vortex jet, and the other is to use heated dry air to certain temperature as working gas in free vortex jet.