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

The Society of Naval Architects of Korea (대한조선학회)
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Prediction of the Effective Wake of an Axisymmetric Body

축대칭 몰수체의 유효반류 추정

  • Kim, Ki-Sup (Korea Research Institute of Ships & Ocean Engineering/KIOST) ;
  • Moon, Il-Sung (Korea Research Institute of Ships & Ocean Engineering/KIOST) ;
  • Ahn, Jong-Woo (Korea Research Institute of Ships & Ocean Engineering/KIOST) ;
  • Kim, Gun-Do (Korea Research Institute of Ships & Ocean Engineering/KIOST) ;
  • Park, Young-Ha (Korea Research Institute of Ships & Ocean Engineering/KIOST) ;
  • Lee, Chang-Sup (Chungnam National University)
  • 김기섭 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 문일성 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 안종우 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 김건도 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 박영하 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 이창섭 (충남대학교 선박해양공학과)
  • Received : 2018.11.21
  • Accepted : 2019.07.10
  • Published : 2019.10.20
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Abstract

An axisymmetric submerged body(L=5.6m, Diam=0.53m) is installed in Large Cavitation Tunnel (LCT) of KRISO and the nominal and total velocities without and with the propeller in operation, respectively, are measured using Laser Doppler Velocimeter (LDV). The flow field is nearly axisymmetric except the wake of the supporting strut, and is considered ideal to study the hydrodynamic interaction between the propeller and the oncoming axisymmetric sheared flow. The measured velocity data are then provided to compute the propeller-induced velocity to get the effective velocity, which is defined by subtracting the propeller-induced velocity from the total velocity. We adopted, in computing the induced velocity, two different methods including the vortex lattice method and the vortex tube actuator model to evaluate the resultant effective velocity distribution. To secure a fundamental base of experimental data necessary for the research on the effective wake, we measured the drag of the submerged body, the nominal and total velocity distributions at various axial locations for three different tunnel water speeds.

Keywords

References

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