Hybrid Optical-Flow-Cross-Correlation Method for Particle Image Velocimetry
Hybrid Optical-Flow-Cross-Correlation Method for Particle Image Velocimetry
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DOI：
10.1115/1.4045572
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发表时间：
2020-05
影响因子：
2
通讯作者：
Tianshu Liu;D. Salazar;Hassan Fagehi;H. Ghazwani;J. Montefort;P. Merati
中科院分区：
文献类型：
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作者：
Tianshu Liu;D. Salazar;Hassan Fagehi;H. Ghazwani;J. Montefort;P. Merati
针对光流法用于大位移粒子图像测速的局限性，提出了一种混合粒子图像测速方法。该混合方法的主要组成部分包括用于初始估计的互相关格式、用于生成移位图像的移位格式和光流格式，用于获得精细的高分辨率速度场。此外，采用预处理方案对光照强度变化进行校正。通过在参数空间进行仿真，并与典型的相关法和光流法进行了比较，评价了混合方法的精度。进一步的定量比较，在圆形空气射流的PIV测量。
A hybrid method for particle image velocimetry (PIV) is developed to overcome the limitations of the optical flow method applied to PIV images with large displacements. The main elements of the hybrid method include a cross-correlation scheme for initial estimation, a shifting scheme for generating a shifted image, and an optical flow scheme for obtaining a refined high-resolution velocity field. In addition, a preprocessing scheme is used for correcting the illumination intensity change. The accuracy of the hybrid method is evaluated through simulations in a parametric space in comparison with the typical correlation methods and optical flow method. Further quantitative comparisons are made in PIV measurements in a circular air jet.