高速复杂流动结构的视频测量

doi:10.7527/S1000-6893.2017.120989

流体力学与飞行力学

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高速复杂流动结构的视频测量

张征宇^1,2, 王显圣¹, 黄叙辉¹, 周润¹, 茆骥²

1. 中国空气动力研究与发展中心高速空气动力研究所, 绵阳 621000;
2. 西南科技大学信息工程学院, 绵阳 621000

收稿日期:2016-11-24 修回日期:2017-01-18 出版日期:2017-08-15 发布日期:2017-02-28
通讯作者: 张征宇,E-mail:zzyxjd@163.com E-mail:zzyxjd@163.com
基金资助:
国家自然科学基金（51475453，11472297）

Videogrammetry measurement for high-speed complex flow structures

ZHANG Zhengyu^1,2, WANG Xiansheng¹, HUANG Xuhui¹, ZHOU Run¹, MAO Ji²

1. High Speed Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
2. Information Engineering College, Southwest University of Science and Technology, Mianyang 621000, China

Received:2016-11-24 Revised:2017-01-18 Online:2017-08-15 Published:2017-02-28
Supported by:
National Natural Science Foundation of China (51475453,11472297)

摘要/Abstract

摘要：

为了定量显示空腔高速复杂流动结构，采用均布的小圆点作为背景纹影（BOS）的背景点，利用视频测量（VM）成熟的小圆点图像定位与匹配技术，克服了现有图像互相关技术对BOS的限制；推导非平行光穿过流场的偏折位移/角计算公式，基于VM的共线方程，准确计算从背景点到相机摄影中心的光束穿过流场产生的偏折位移场和光程差场（OPD）。FL-21风洞的某空腔高速（马赫数为0.6~2.0）复杂流动结构的视频测量结果表明：本方法可清楚分辨出亚微米量级的光程差差异与微弧度量级的偏折角差异，定量显示空腔高速流动产生的波/涡/剪切层的位置、强弱及其相互关系，为复杂流动结构与气动光学效应的测量与显示提供新的途径，其光路简单、无需价格昂贵的相干光源，具有应用前景。

关键词: 气动光学, 视频测量, 流动显示, 纹影, 风洞试验, 成像检测

Abstract:

To quantify the structures of high-speed flow over a cavity, small circle points with equal space in the row and column are used as background for background oriented schlieren (BOS), and image processing techniques of mark points in videogrammetry measurement (VM) are also employed to break the limits of cross-correlation in existing BOS. The expressions for computing refraction angle and displacement of nonparallel beams are derived. The fields of optical path difference (OPD) and refraction displacement when the beams from the small circle points to the center of the camera is crossing the flow are accurately calculated based on VM collinear equations. The measuring data on flow over the cavities in FL-21 wind tunnel demonstrates that the OPD differences no more than 1 μm and refraction angle about 1 μrad can be perceived distinctly, and the structures of waves/vortices/shear layer are quantified. The method proposed can provide a new way to measure aero-optic effects and visualize the complex flows. With simple optical system and no expensive coherent sources, the method has great application potential.

Key words: aero-optics, videogrammetry measurement, flow visualization, schlieren, wind tunnel test, imaging measurement

中图分类号:

V211.7

张征宇, 王显圣, 黄叙辉, 周润, 茆骥. 高速复杂流动结构的视频测量[J]. 航空学报, 2017, 38(8): 120989-120989.

ZHANG Zhengyu, WANG Xiansheng, HUANG Xuhui, ZHOU Run, MAO Ji. Videogrammetry measurement for high-speed complex flow structures[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(8): 120989-120989.

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E-mail：hkxb@buaa.edu.cn

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高速复杂流动结构的视频测量

Videogrammetry measurement for high-speed complex flow structures

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