Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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A Study on the Resistance Performance and Flow Characteristic of Ship with a Fin Attached on Stern Hull

선박 선미부 핀 부착에 의한 저항성능 및 유동 특성에 관한 연구

  • Lee, Jonghyeon (Shipbuilding & Marine Simulation Center, Tongmyong University) ;
  • Kim, Inseob (Smart Safety Research Department, Korea Maritime Transportation Safety Authority) ;
  • Park, Dong-Woo (School of Naval Architecture & Ocean Engineering, Tongmyong University)
  • 이종현 (동명대학교 조선해양시뮬레이션센터) ;
  • 김인섭 (한국해양교통안전공단 스마트안전연구실) ;
  • 박동우 (동명대학교 조선해양공학부)
  • Received : 2021.12.01
  • Accepted : 2021.12.28
  • Published : 2021.12.31
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Abstract

In this study, a fin that controls ship stern flow was attached on stern hull of a 80k bulk carrier to improve resistance performance. The rectangular cross-sectional fin was attached at several locations on the hull, and angle to streamline was changed with constant length, breadth, and thickness. The resistance performance and wake on propeller plane of the hull with and without the fin were analyzed using model-scale computational fluid dynamics simulation. The analysis results were extrapolated to full-scale to compare the performance and wake of the full-scale ship. First, the fin changed path of bilge vortex that flowed into the propeller along the stern hull without the fin to transom stern. This change increased pressure of the stern hull and upper region of the propeller, so pressure resistance and total resistance of the hull were reduced - the nearer the fin location to after perpendicular (AP) and base line of the hull, the larger the reduction of the resistances. Second, nominal wake fraction of the hull with the fin was lower than that without the fin. This dif erence was in proportion to the angle of the fin, but the total resistance reduction was in proportion until a certain angle at which the reduction was maximum. The largest total resistance reduction was approximately 2.1% at 12.5% of length between perpendiculars from the AP, 10% of draft from the base line, and 14° with respect to the streamline.

본 연구에서는 80k Bulk carrier의 저항성능 향상을 목적으로 선미부에 1개의 핀을 부착해 선미 유동을 제어하였고, 저항성능 및 반류의 변화를 분석하였다. 부착된 핀은 직사각형 단면을 가지며, 길이와 폭, 두께는 고정된 채 길이 및 흘수 방향 부착 위치와 유선에 대한 각도만 변화가 있었다. 나선 및 핀이 부착된 선체에 대한 모형 스케일에서의 CFD 해석이 수행되었고, 그 결과를 실선 확장 후 비교하였다. 핀은 프로펠러로 유입되는 빌지 볼텍스의 경로를 선미 트랜섬 쪽으로 변화시켰고, 이는 프로펠러 상부와 선미부의 압력을 증가시켰다. 이로 인해 선체의 압력저항 및 전 저항이 감소되었으며, 감소율은 핀의 부착 위치가 선미 및 선저와 가까울수록 높았다. 또한 핀은 공칭반류를 감소시켰는데 핀의 각도가 커질수록 반류의 변화가 컸고, 전 저항 저감률은 최대가 되는 특정 각도까지만 비례하였다. 대상 선박에 단일 핀을 부착했을 시의 최대 전 저항 저감률은 약 2.1 %였고, 선미로부터 수선간장의 12.5%, 선저로부터 흘수의 10 % 위치에 14°의 각도로 부착됐을 때이다.

Keywords

Acknowledgement

이 연구는 부산광역시의 대학혁신연구단지조성사업 중 '동명대학교 대학혁신연구단지조성사업'의 지원을 받아 수행되었습니다(IURP2101).

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