Application of Optical Flow Analysis to Shadowgraph Images of Impinging Jet  

作　　者：Masato Hijikuro Masayuki Anyoji Masato Hijikuro;Masayuki Anyoji(Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, Japan)

机构地区：[1]Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, Japan

出　　处：《Journal of Flow Control, Measurement & Visualization》2020年第4期173-187,共15页流量控制、测量及可视化（英文）

摘　　要：In this study, we apply the optical flow method to the time-series shadowgraph images of impinging jets using a high-speed video camera with high spatial and temporal resolution. This image analysis provides quantitative velocity vector fields in the object space without tracer particles. The analysis results clearly capture the details of the coherent vortex structure and its advection from the shear layer of the free jet. Although the results still leave challenges for the quantitative validation, the results show that this analysis method is effective for understanding the details of the physical phenomenon based on the quantitative values extracted from the shadowgraph images.In this study, we apply the optical flow method to the time-series shadowgraph images of impinging jets using a high-speed video camera with high spatial and temporal resolution. This image analysis provides quantitative velocity vector fields in the object space without tracer particles. The analysis results clearly capture the details of the coherent vortex structure and its advection from the shear layer of the free jet. Although the results still leave challenges for the quantitative validation, the results show that this analysis method is effective for understanding the details of the physical phenomenon based on the quantitative values extracted from the shadowgraph images.

关 键 词：Impinging Jet Optical Flow SHADOWGRAPH Image Analysis Velocity Vector 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]