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PIV measurements of hull wake behind a container ship model with varying loading condition SCIE SCOPUS

Title
PIV measurements of hull wake behind a container ship model with varying loading condition
Authors
Lee, JYPaik, BGLee, SJ
Date Issued
2009-04
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
Flow characteristics of the hull wake behind a container ship model were investigated under different loading conditions (design and ballast loadings) by employing the particle image velocimetry (PIV) technique. Measurements were made at four transverse locations and two longitudinal planes for three Reynolds numbers (Re) ( = U(0)Lpp/v, where U-0 is the freestream velocity, Lpp is the length between two perpendiculars of the ship model and v is the kinematic viscosity) of 5.08 x 10(5), 7.60 x 10(5), and 1.01 x 10(6). it was observed that symmetric, large-scale, longitudinal counter-rotating vortices (with respect to centerline) of nearly the same strength were formed in the near wake. For the ballast-loading condition, the vortices appear at propeller plane below the propeller-boss. The vortex center exhibits a significant upward shift near the propeller-boss as the Reynolds number increase, and as the flow moves downstream. Under the design-loading condition, the vortices first appear at a further downstream location than that for the ballast-loading condition above the propeller-boss. This difference in the flow structure can significantly change the inflow conditions to the propeller blades, Such as the streamwise mean velocity profiles and turbulence intensity distributions at the Propeller plane. In particular, under the ballast-loading condition, asymmetric inflow may weaken the propulsion and cavitation performance of the marine propeller. (C) 2009 Elsevier Ltd. All rights reserved.
Keywords
Two-frame PIV; Loading condition; Hull wake; Longitudinal vortex; Inflow; VELOCITY-FIELD MEASUREMENTS; ROTATING PROPELLER; FLOW; TUNNEL
URI
https://oasis.postech.ac.kr/handle/2014.oak/26427
DOI
10.1016/J.OCEANENG.2009.01.006
ISSN
0029-8018
Article Type
Article
Citation
OCEAN ENGINEERING, vol. 36, no. 5, page. 377 - 385, 2009-04
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이상준LEE, SANG JOON
Dept of Mechanical Enginrg
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