Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Numerical Study on the Gap Flow of a Rudder System with Bisymmetric Blocking Bar

차단 봉이 혼과 타판 사이에 대칭으로 배치된 타의 틈새유동 수치해석

  • 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)
  • 오정근 (인하대학교 정석물류통상연구원) ;
  • 서대원 (인하대학교 선박공학과) ;
  • 김효철 (인하대학교 정석물류통상연구원)
  • Published : 2009.10.20
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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.

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References

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  1. Practically applicable devices for blocking the gap flow of a horn rudder to reduce rudder cavitation and their verification through numerical simulations vol.17, pp.1, 2012, https://doi.org/10.1007/s00773-011-0149-7