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Aero-optical aberration measuring method based on NPLS and its application
  • ISSN号:1001-6538
  • 期刊名称:科学通报(英文版)
  • 时间:0
  • 页码:3545-3549
  • 语言:中文
  • 分类:O354.3[理学—流体力学;理学—力学] TQ171.721[化学工程—玻璃工业;化学工程—硅酸盐工业]
  • 作者机构:[1]College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, China
  • 相关基金:This work was supported by the National Natural Science Foundation of China (10672178, 10772168) and National Basic Research Program of China (2009CB724100).
  • 相关项目:超声速剪切层中失稳结构的理论与实验研究
中文摘要:

为测量飞行器光的错误的存在方法受不了几个问题,例如低空间与时间的分辨率,到环境的敏感,和不可分的效果。为测量超声的流动的飞行器光的错误的一个新方法被建议。基于超声的密度地的自我开发的测量方法,超声的流动地的一张剖面图导致的波前错误能被测量由跟踪光线。与另外的方法相比,现在的有三重要革新:(1 ) 高空间与时间的分辨率。它的时间分辨率是 6 ns,和空间分辨率罐头活动范围直到测微计;(2 ) 它能避免不可分的效果并且学习局部地由兴趣的流动领域导致的波前错误;(3 ) 它能也从测试节墙边界层和环境骚乱避免影响。现在的方法在一顶光鞠躬帽子附近被用于超声的流动。高空间与时间的分辨率的结果揭示好波前结构,并且显示出那个冲击波,扩大波浪和狂暴的边界层在波前错误上有不同影响。

英文摘要:

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.

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