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

The Society of Naval Architects of Korea (대한조선학회)
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A Numerical Study on the Influence of the Horizontal Gap upon the Cavitation Behavior of a Horn Type Rudder

혼-타의 수평틈새가 캐비테이션에 미치는 영향에 관한 수치적 연구

  • Seo, Dae-Won (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Lee, Seung-Hee (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Kim, Hyo-Chul (Jungseok Research Institute of International Logistics and Trade, Inha University) ;
  • Oh, Jung-Keun (Jungseok Research Institute of International Logistics and Trade, Inha University)
  • 서대원 (인하대학교 조선해양공학과) ;
  • 이승희 (인하대학교 조선해양공학과) ;
  • 김효철 (인하대학교 정석물류통상연구원) ;
  • 오정근 (인하대학교 정석물류통상연구원)
  • Published : 2010.04.20
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Abstract

Recently, as container ships become larger and faster, rudder cavitations are more frequently observed near the gap between the horn and rudder plates of the ships to cause serious damages to the rudder surface of the ship. The authors already have suggested through a series of model experiments and numerical computations that employment of an appropriate blocking device for gap flow may retard the gap cavitation. For examples, a cam device installed near the outer edges of the vertical gap or a water-injection device combined with a pair of half-round bars installed inside the gap can considerably reduce the gap cavitation. However, it is also found that effective blocking of the flow through the vertical gap results in growth of the cavitation near the horizontal gap instead. In the present study, effectiveness of the simultaneous blocking of the flow through the horizontal and vertical gaps of a horn type rudder in minimizing the damage by gap cavitation is studied. Additional blocking disks are inserted inside the horizontal gaps on the top and bottom of the pintle block and numerical computations are carried out to confirm the combined effect of the blocking devices.

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References

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