Extensional study of optical-flow enhanced hybrid PIV method for dual-plane stereoscopic PIV measurement. (1st September 2022)

• Record Type: Journal Article
• Authors: Wang, Sirui; Zheng, Jianyi; Li, Lei; Xia, Xi; Han, Xiao; Zhang, Chi; Qi, Fei; Yang, Zifeng
• Is Part Of: Measurement science & technology. Volume 33:Number 9(2022)
• Publication Date: 2022-09-01
• Subjects: DP-s-PIV -- hybrid PIV -- enhanced spatial resolvability -- vortex identification; Physical measurements -- Periodicals; Scientific apparatus and instruments -- Periodicals; Equipment and Supplies -- Periodicals; Science -- instrumentation -- Periodicals; Technology -- instrumentation -- Periodicals; Mesures physiques -- Périodiques; Physical measurements; Scientific apparatus and instruments; Periodicals; 502.87
• DOI: 10.1088/1361-6501/ac6fb1
• Languages: English
• ISSNs: 0957-0233

Abstract

Abstract: High-speed dual-plane stereoscopic particle image velocimetry (DP-s-PIV) can capture time-resolved three-component velocity and vorticity vectors in the measurement region, but its spatial resolvability of tiny vortices is blocked by the intrinsic limitation of the cross-correlation evaluation. To overcome this limitation, we propose a scheme to extend the original two-component optical-flow enhanced hybrid PIV method to DP-s-PIV through 3D reconstruction, with its feasibility and resolvability validated through comparison with the cross-correlation evaluation used in DaVis 8.4. The comparisons suggest that the optical-flow enhanced hybrid PIV scheme can greatly improve the spatial resolvability of the velocity field for DP-s-PIV. Moreover, the hybrid scheme can also provide better visualization of vortical structures and enhanced precision in evaluating the vorticity distribution, allowing for further identification of vortex types in a stratified swirling jet flow through the combined criteria (vorticity component and Q criterion).