Image-preprocessing method for near-wall particle image velocimetry   (PIV) image interrogation with very large in-plane displacement

doi:10.1088/0957-0233/24/12/125302

CORC > 北京大学 > 工学院

	Image-preprocessing method for near-wall particle image velocimetry (PIV) image interrogation with very large in-plane displacement
	Zhu, Yiding ; Yuan, Huijing ; Zhang, Chuanhong ; Lee, Cunbiao
刊名	measurement science technology
	2013
关键词	PIV and PTV image preprocessing very large in-plane displacement hypersonic wall-bounded flow SINGLE-PIXEL RESOLUTION BOUNDARY-LAYER MICRO-PIV IMPROVEMENT FLOW THIN PTV
DOI	10.1088/0957-0233/24/12/125302
英文摘要	Accurate particle image velocimetry (PIV) measurements very near the wall are still a great challenge. The problem is compounded by the very large in-plane displacement on PIV images commonly encountered in measurements in hypersonic boundary layers. An improved image-preprocessing method is presented in this paper which expands the traditional window deformation iterative multigrid scheme to PIV images with very large displacement. Before the interrogation, stationary artificial particles of uniform size are added homogeneously in the wall region. The mean squares of the intensities of signals in the flow and in the wall region are postulated to be equal when half the initial interrogation window overlaps the wall region. The initial estimation near the wall is then smoothed by data from both sides of the shear layer to reduce the large random uncertainties. Interrogations in the following iterative steps then converge to the correct results to provide accurate predictions for particle tracking velocimetries. Significant improvement is seen in Monte Carlo simulations and experimental tests. The algorithm successfully extracted the small flow structures of the second-mode wave in the hypersonic boundary layer from PIV images with low signal-noise-ratios when the traditional method was not successful.; Engineering, Multidisciplinary; Instruments & Instrumentation; SCI(E); EI; 0; ARTICLE; 12; 24
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/315835]
专题	工学院
推荐引用方式 GB/T 7714	Zhu, Yiding,Yuan, Huijing,Zhang, Chuanhong,et al. Image-preprocessing method for near-wall particle image velocimetry (PIV) image interrogation with very large in-plane displacement[J]. measurement science technology,2013.
APA	Zhu, Yiding,Yuan, Huijing,Zhang, Chuanhong,&Lee, Cunbiao.(2013).Image-preprocessing method for near-wall particle image velocimetry (PIV) image interrogation with very large in-plane displacement.measurement science technology.
MLA	Zhu, Yiding,et al."Image-preprocessing method for near-wall particle image velocimetry (PIV) image interrogation with very large in-plane displacement".measurement science technology (2013).