Measurements of the rudder inflow affecting the rudder cavitation
- Authors
- Paik, B.-G.; Kim, G.-D.; Kim, K.-S.; Kim, K.-Y.; Suh, S.-B.
- Issue Date
- 2012
- Keywords
- Angle of attack; PIV (particle image velocimetry); Propeller wake; Rudder cavitation; Rudder inflow; Semi-spade rudder
- Citation
- Ocean Engineering, v.48, pp 1 - 9
- Pages
- 9
- Journal Title
- Ocean Engineering
- Volume
- 48
- Start Page
- 1
- End Page
- 9
- URI
- https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/1044
- DOI
- 10.1016/j.oceaneng.2012.03.005
- ISSN
- 0029-8018
- Abstract
- The main objective of present study is to examine the characteristics of the complex rudder inflow(propeller slipstream) against the rudder cavitation using visualization technique. The rotating propeller of 6 blades and the semi-spade rudder are set in a medium-size cavitaion tunnel with a uniform flow condition. The rudder distorts the angle-of-attack (AoA) or incident angle to the leading edge of the rudder blade. Several methods such as uniform stream line, time-averaged velocity field and locally sampled area are proposed to analyze the AoA and show similar AoA values of 5-7° at the region of no rudder and no propeller trailing vorticity effects. However, it increases to 20°by those effects as the inflow comes to the rudder. From the AoA analysis the cavitation durability is found to be about 7°in terms of the rudder angle. Cautious access is additionally necessary to introduce a reasonable safety against those cavitation phenomena that would significantly influence the durability of the movable part. ? 2012 Elsevier Ltd. All rights reserved.
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