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Analysis of unstable vortical structure in a propeller wake affected by a simulated hull wake SCIE SCOPUS

Title
Analysis of unstable vortical structure in a propeller wake affected by a simulated hull wake
Authors
Paik, BGKim, KYLee, JYLee, SJ
Date Issued
2010-06
Publisher
SPRINGER
Abstract
A two-frame PIV (particle image velocimetry) technique was used to investigate the flow characteristics of a complicated propeller wake influenced by a hull wake. As the propeller is significantly affected by the hull wake of a marine vessel, measurements of the propeller wake under the hull wake are certainly needed for more reliable validation of numerical predictions. Velocity field measurements were conducted in a cavitation tunnel with a simulated hull wake. Generally, the hull wake generated by the hull of a marine ship may cause different loading distributions on the propeller blade in both the upper and the lower propeller planes. The unstable propeller wake caused by the ship's hull was interpreted in terms of turbulent kinetic energy (T (KE)) to obtain useful information for flow modeling. The unstable or unsteady phenomenon in the upper propeller wake was identified by using the proper orthogonal decomposition (POD) method to characterize the coherent flow structure with turbulent kinetic energy. Strong unsteadiness appeared in the second and higher modes, largely affecting the downstream flow characteristics. The first eigenmode can be used to appropriately identify the tip vortex positions even in the unstable downstream region, which are helpful for establishing reliable wake modeling.
Keywords
PARTICLE IMAGE VELOCIMETRY; ROTATING PROPELLER; PIV TECHNIQUE; FLOW
URI
https://oasis.postech.ac.kr/handle/2014.oak/25455
DOI
10.1007/S00348-009-0798-Z
ISSN
0723-4864
Article Type
Article
Citation
EXPERIMENTS IN FLUIDS, vol. 48, no. 6, page. 1121 - 1133, 2010-06
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이상준LEE, SANG JOON
Dept of Mechanical Enginrg
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