EXPERIMENTAL INVESTIGATION ON VORTEX BREAKDOWN IN SPIN-UP AND SPIN-DOWN PROCESSES VIA PIV

作     者：LiuYing-zheng KoyamaHideS. ChenHan-ping Liu Ying zheng Department of Power Machinery Engineering, Shanghai Jiaotong University, Shanghai 200030, ChinaKoyama Hide S.Department of Mechanical Engineering, Tokyo Denki University, Tokyo 101 8457, JapanChen Han ping Department of Power Machinery Engineering, Shanghai Jiaotong University, Shanghai 200030, China

作者机构：DepartmentofPowerMachineryEngineeringShanghaiJiaotongUniversityShanghai200030China DepartmentofMechanicalEngineeringTokyoDenkiUniversityTokyo101-8457Japan 

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

年 卷 期：2003年第15卷第2期

页      面：58-63页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

主　　题：vortex breakdown PIV swirling flow 

摘      要：The whole field measurements of swirling flow in spin-up and spin-downprocesses via PIV are presented in the paper. Investigation of the flow patterns at H/R = 1. 50 wasexperimentally carried out for the first time in both processes. By means of symmetry analysis, itis found that the overall flow structure in the spin-up process still keep axi-symmetric to a greatextent, but deteriorated very fast in the spin-down process. The time to settle to the state of restin the spin-down process is found to be greatly shorter than the time to achieve the steady statein the spin-up process. Temporarily oscillatory vortex breakdown was discovered during the spin-upprocess, although no breakdown in the steady state at the same Reynolds number is found in preciousresearches.