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

The Society of Naval Architects of Korea (대한조선학회)
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A Captive Model Test on Hydrodynamic Force and Neutral Level Flight of BB2 Submarine in Straight Operation at Near Free Surface with Different Depths

자유수면 근처에서 직진하는 BB2 잠수함의 심도별 유체력과 중립운항에 대한 구속모형시험 연구

  • Kwon, Chang-Seop (Korea Research Institute of Ships & Ocean Engineering) ;
  • Kim, Dong-Jin (Korea Research Institute of Ships & Ocean Engineering) ;
  • Yun, Kunhang (Korea Research Institute of Ships & Ocean Engineering) ;
  • Kim, Yeon-Gyu (Korea Research Institute of Ships & Ocean Engineering)
  • 권창섭 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 김동진 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 윤근항 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 김연규 (한국해양과학기술원 부설 선박해양플랜트연구소)
  • Received : 2022.08.09
  • Accepted : 2022.08.29
  • Published : 2022.10.20
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Abstract

In this study, the force and moment acting on a Joubert BB2 submarine model at depths near the free surface were measured through a captive model test with the scale ratio of 1/15. Based on the experiment, the pitch moment and heave force due to the "Tail suction effect", including the change in surge force with depth near the free surface, were quantitatively analyzed. The change of force and moment according to the relative position of the sail and the free surface was reviewed with the free surface waves generated for each depths. As a result, the angle of attack of the hull to counteract the pitch moment induced by the tail suction effect was derived. The effect of the hydrostatic moment component according to the angle of attack on the equilibrium of pitch moment was also taken into account. The control plane performance tests for the X-type rudder and sail plane were conducted in snorkel and surface depth conditions to figure out the control plane angles for the neutral level flight of the submarine at near free surface. The results of this study are expected to be used as a reference data for the neutral level flight of the submarine at near free surface operation in the free running model test as well as numerical studies.

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Acknowledgement

본 논문은 해양수산부 재원으로 선박해양플랜트연구소의 주요사업인 "수중운동체 운항성능 통합 추정 기술개발(3/5) (PES4250)"에 의해 수행되었습니다(1525012981).