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http://dx.doi.org/10.3744/SNAK.2009.46.5.460

Numerical Study on the Gap Flow of a Rudder System with Bisymmetric Blocking Bar  

Oh, Jung-Keun (Jungseok Research Institute of International Logistics and Trade, Inha University)
Seo, Dae-Won (Department of Naval Architecture and Ocean Engineering, Inha University)
Kim, Hyo-Chul (Jungseok Research Institute of International Logistics and Trade, Inha University)
Publication Information
Journal of the Society of Naval Architects of Korea / v.46, no.5, 2009 , pp. 460-470 More about this Journal
Abstract
In recent practice a half round prismatic bar has fillet welded or formed through foundry work along the centerline on rear concave surface of the horn to mitigate gap flow between fixed and movable part of the rudder system. When the gap clearance has been blocked with this practice, numerical simulations indicate that the practices are not only effective in reducing the gap flow but also in mitigating the cavitation. The blocking effects are remarkably improved when a pair of blocking bar is bisymmetrically attached with respect to centerline on the opposite convex surface of the movable part. The blocking bar could be placed on the exposed surface under maximum rudder angle. This implies that the blocking bar could be easily adopted not only in a design stage but also in a maintenance stage for mitigating rudder cavitation. In addition, the numerical simulations imply that more improvements could be anticipated through the selection of section shape of prismatic bar for gap flow blocking.
Keywords
Rudder gap cavitation; Blocking bar; Gap flow;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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