超声速弹头凹型光学头罩流动显示研究

Flow visualization of supersonic flow around a concave optical bow cap model of warhead

在自行设计的Ma=3.8超声速风洞中,采用基于纳米技术的平面激光散射(NPLS)方法对超声速弹头凹型光学头罩流场进行了流动显示实验。高时空分辨率的NPLS图像再现了激波、膨胀波、边界层及尾迹等流场结构。观察到了边界层的产生、发展及转捩过程。通过对时间相关图像的分析,可以精确测定边界层内大尺度结构的几何特征和时间演化特征。

Supersonic flow around a concave optical bow cap model of warhead was carried out in the Ma = 3.8 supersonic wind tunnel by Nano-based Planar Laser Scattering （NPLS） method. NPLS images at high spatiotemporal resolution reveal shockwave, expansion wave, boundary layer and wake in the flow. Generation, development and transition of boundary layer were also observed. By analyzing the temporal correlation of NPLS images, geometrical character and temporal evolution measured quantificationally. of large-scale structure of boundary layer can be