Aero-optical aberration measuring method based on NPLS and its application  

作　　者：YI ShiHe TIAN LiFeng ZHAO YuXin HE Lin CHEN Zhi 

机构地区：[1]College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, China

出　　处：《Chinese Science Bulletin》2010年第31期3545-3549,共5页

基　　金：supported by the National Natural Science Foundation of China (10672178, 10772168);National Basic Research Program of China (2009CB724100)

摘　　要：The existing methods for measuring aero-optical aberration suffer from several problems,such as low spatiotemporal resolution,sensitivity to environment,and integral effects.A new method for measuring aero-optical aberration of supersonic flow is proposed.Based on the self-developed measuring method of supersonic density field,the wavefront aberration induced by a cross-section of supersonic flow field could be measured by ray-tracing.Compared with other methods,the present one has three significant innovations:(1) high spatiotemporal resolution.Its time resolution is 6 ns,and the spatial resolution can reach up to micrometers;(2) it can avoid the integral effects and study the wavefront aberration induced by the flow field of interest locally;(3) it can also avoid the influence from the test section wall boundary layers and environmental disturbances.The present method was applied to supersonic flow around an optical bow cap.The results of high spatiotemporal resolution reveal fine wavefront structures,and show that shock waves,expansion waves and turbulent boundary layers have different impacts on the wavefront aberration.The existing methods for measuring aero-optical aberration suffer from several problems, such as low spatiotemporal resolution, sensitivity to environment, and integral effects. A new method for measuring aero-optical aberration of supersonic flow is proposed. Based on the self-developed measuring method of supersonic density field, the wavefront aberration induced by a cross-section of supersonic flow field could be measured by ray-tracing. Compared with other methods, the present one has three significant innovations： （1） high spatiotemporal resolution. Its time resolution is 6 ns, and the spatial resolution can reach up to micrometerS; （2） it can avoid the integral effects and study the wavefront aberration induced by the flow field of interest locally; （3） it can also avoid the influence from the test section wall boundary layers and environmental disturbances. The present method was applied to supersonic flow around an optical bow cap. The results of high spatiotemporal resolution reveal fine wavefront structures, and show that shock waves, expansion waves and turbulent boundary layers have different impacts on the wavefront aberration.

关 键 词：测量方法 光学畸变 不良贷款 气动 应用 时空分辨率 超音速流动 超声速流场 

分 类 号：O354.3[理学—流体力学] TQ171.721[理学—力学]