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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/36912

Title: Experimental Investigations on the Flow Structure and Turbulence of the Propeller Tip Vortex at Different Cavitation States
Authors: Y.-C. Chow;W.-C. Tsai;Y.-H. Lee
周一志
Contributors: NTOU:Department of Systems Engineering and Naval Architecture
國立臺灣海洋大學:系統工程暨造船學系
Date: 2009-08
Issue Date: 2015-05-19T06:58:25Z
Publisher: The 7th International Symposium on Cavitation (CAV2009), University of Michigan, Ann Arbor, Michigan, USA
Abstract: Abstract: In a previous series of open water tests for a certain marine propeller, we kept decreasing the advance coefficient and observed the propeller tip vortex going through a process from non-cavitating to cavitating and back to non-cavitating but micro-bubble-filled conditions. This process provides an excellent opportunity for investigating the flow structure and the turbulence associated with the tip vortex under different statuses of cavitation. Particle image velocimetry technique is used to measure the instantaneous velocity distributions at six experimental conditions parameterized with the advance coefficient and the cavitation number. The results show that the mean circulation (or mean kinetic energy) of either the cavitating or the micro-bubble-filled tip vortex is greater than that of the singlephase (liquid) counterpart, whereas the turbulent kinetic energy associated with the tip vortex has an opposite trend. These phenomena imply that extraordinary kinetic energy sources/transfers within the flow exist due to interactions between the vapor and the liquid phases of the tip vortex fluid.
URI: http://ntour.ntou.edu.tw/handle/987654321/36912
Appears in Collections:[系統工程暨造船學系] 演講及研討會

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