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Development of LDV(Laser Doppler Velocimetry) for Measuring Three Dimensional Hull Wake of Ship Model in Large Cavitation Tunnel

대형 캐비테이션 터널 내 선박 모형의 3차원 선체 반류 계측을 위한 레이저 유속계 개발

  • Paik, Bu-Geun (Korea Research Institute of Ships & Ocean Engineering) ;
  • Ahn, Jong-Woo (Korea Research Institute of Ships & Ocean Engineering) ;
  • Seol, Han-Shin (Korea Research Institute of Ships & Ocean Engineering) ;
  • Park, Young-Ha (Korea Research Institute of Ships & Ocean Engineering) ;
  • Kim, Ki-Sup (Korea Research Institute of Ships & Ocean Engineering) ;
  • Cheon, Ho-Geun (FMS(Fluid & Solid Mechanics Solution)(Dantec Dynamics))
  • 백부근 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 안종우 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 설한신 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 박영하 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 김기섭 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 전호근 (단텍 다이너믹스)
  • Received : 2017.04.13
  • Accepted : 2017.11.15
  • Published : 2017.12.20

Abstract

Large Cavitation Tunnel (LCT) of KRISO enables us to conduct cavitation tests of the propeller attached to a ship model. As the ship model tests are done at rather high Reynolds number of 107~108, flow measurement system such as pitot tube cannot be employed because of structural safety problems in its system and difficulties in installing it within the test section. Thus, KRISO has developed new 3-D LDV system used in large test section of LCT. There are several difficulties in using 3-D LDV, which did not allow efficient operation of it. The first trouble was the calibration using the conventional pin hole. To make the focus with same laser-beam waists at the wanted position, the high spatial resolution CCD is utilized in the calibration procedure for 3-D LDV. The off-axis configuration provides two velocity components in the horizontal plane and on-axis configuration gives third velocity component in the vertical plane. The horizontal velocity components are also obtained in the coincidence mode, which prevents any misleading results in the off-axis configuration. The nominal wake of Aframax tanker model is measured by the developed 3-D LDV system. The measured hull wake showed good agreement with that obtained by CFD calculation.

Keywords

References

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