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

作　　者：田立丰[1] 易仕和[1] 赵玉新[1] 何霖[1] 程忠宇[1] 

机构地区：[1]国防科学技术大学航天与材料工程学院,长沙410073

出　　处：《实验流体力学》2009年第1期15-17,共3页Journal of Experiments in Fluid Mechanics

基　　金：自然科学基金(100672178)

摘　　要：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

关 键 词：NPLS 高时空分辨率 湍流边界层 弹头模型 

分 类 号：V211.753[航空宇航科学与技术—航空宇航推进理论与工程]