Photogrammetry for accurate model deformation measurement in a supersonic wind tunnel
Photogrammetry for accurate model deformation measurement in a supersonic wind tunnel
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DOI：
10.1007/s00348-018-2652-7
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发表时间：
2019-01-01
影响因子：
2.4
通讯作者：
Santer, Matthew
中科院分区：
文献类型：
--
作者：
Gramola, Michela;Bruce, Paul J. K.;Santer, Matthew
在高速应用的自适应设备的兴趣导致需要一个准确和可靠的技术，以获得在实验过程中的模型变形测量。点跟踪摄影测量已被应用于超音速风洞试验，使用四个Phantom高速相机放置在工作部分的两侧，编码目标被应用到感兴趣的表面。在正激波和斜激波下对固体板进行的校准实验可以量化光学畸变的来源，即风洞玻璃窗和空气动力效应（工作段中的低压和激波与边界层之间的相互作用）。应用校正矩阵来解释由于玻璃引起的光学失真，并且对于具有显著位移（1mm量级）的应用，由于空气动力学效应引起的均方根误差被认为是可以忽略的。应用摄影测量学对柔性冲击控制凸块进行了研究，结果表明可以准确地检测凸块形状，同时揭示了一些复杂的三维效果，这些效果不能通过展向平均技术（如纹影摄影）来揭示。
The interest in adaptive devices for high-speed applications leads to the need for an accurate and reliable technique to obtain model deformation measurements during experiments. Point-tracking photogrammetry has been applied to supersonic wind tunnel testing, using four Phantom high-speed cameras placed on either side of the working section, where coded targets were applied to the surface of interest. Calibration experiments on a solid plate beneath a normal shock and a oblique shock allowed the quantification of the sources of optical distortion, namely the wind tunnel glass windows and aerodynamic effects (the lower pressure in the working section and the interaction between shock waves and the boundary layer). A correction matrix was applied to account for the optical distortion due to the glass, and the root-mean-square error due to aerodynamic effects is believed to be negligible for applications with significant displacements (of the order of 1mm). The application of photogrammetry to a flexible shock control bump has shown that the bump shape can be detected accurately, while disclosing some complex 3D effects that could not have been revealed by spanwise-averaged techniques such as schlieren photography.Graphical abstract3D reconstruction of an adaptive shock control bump from photogrammetry with the corresponding shadowgraph picture showing the -shock structure (dimensions in mm)[GRAPHICS].