CONDITIONAL AVERAGING OF TR-PIV MEASUREMENTS OF WAKE BEHIND SQUARE CYLINDER USING AN IMPROVED CROSS-CORRELATION APPROACH

作     者：YU Jun SHI Liu-liu WANG Wei-zhe LIU Ying-zheng YU Jun,SHI Liu-liu,WANG Wei-zhe,LIU Ying-zheng Key Laboratory for Power Machinery and Engineering of Ministry of Education,Shanghai Jiao Tong University,Shanghai,200240,China

作者机构：Key Laboratory for Power Machinery and Engineering of Ministry of Education Shanghai Jiao Tong University Shanghai 200240 China 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2010年第22卷第1期

页      面：29-34页

核心收录：

学科分类：07[理学] 08[工学] 0824[工学-船舶与海洋工程] 0701[理学-数学] 082401[工学-船舶与海洋结构物设计制造] 070101[理学-基础数学] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.50606024 50711140398) 

主　　题：PIV cross-correlation coherent structure phase averaging 

摘      要：An improved phase averaging method based on cross-correlation of the instantaneous velocity field determined by TR-PIV measurements is proposed in this article. A Time-Resolved Particle Image Velocimetry （TR-PIV） is used to measure the two-dimensional wake behind the square cylinder. The phase signals associated with the deterministic appearance of the Karman vortex street are obtained by calculating the correlation matrix of the low-pass filtered velocity field, and can provide the complete information of the phase-averaged wake flow. The results show the advantages of the enhanced methodology in extracting the quasi-periodic flow patterns related to the shedding coherent structures without using additional reference signals.