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Investigation on the vortex structure of propeller wake influenced by loading on the blade

Authors
Paik, Bu-GeunKim, JinPark, Young-HaKim, Ki-Sup
Issue Date
6월-2007
Publisher
SPRINGER JAPAN KK
Keywords
two-frame PIV; propeller wake; tip vortex; swirling strength; vortex strength
Citation
JOURNAL OF MARINE SCIENCE AND TECHNOLOGY, v.12, no.2, pp 72 - 82
Pages
11
Journal Title
JOURNAL OF MARINE SCIENCE AND TECHNOLOGY
Volume
12
Number
2
Start Page
72
End Page
82
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/1402
DOI
10.1007/s00773-006-0237-2
ISSN
0948-4280
1437-8213
Abstract
The vortex structure of the wake behind a marine propeller was investigated in terms of loading variation by using particle image velocimetry. One hundred and fifty instantaneous velocity fields were ensemble averaged to study the spatial evolution of the wake and the behavior of the tip vortices in the region ranging from the trailing edge to one propeller diameter downstream. The trailing vorticity was found to be related to the radial velocity jump, and the viscous wake was affected by the boundary layers developed on the blade surfaces. A vortex identification method using the swirling strength was employed to extract the location of the tip vortex. The loading on the blade made a clear difference to the contraction angles. Slipstream contraction occurred in the very near wake region, and unstable oscillation occurred because of reduced interaction between the tip vortex and the wake sheet behind the maximum contraction point for each loading condition. The maximum tangential velocity around the tip vortex center revealed the average radius of its core, which was used for calculating the vortex strength. Additionally, variation of the average radius of tip vortices with the change of blade loading was related to vortex tube stretching in the wake region. The nearly constant vortex strength continued up to one diameter downstream for light loading and design loading conditions.
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Paik, Bu Geun
지능형선박연구본부 (함정공학연구센터)
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