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

The Society of Naval Architects of Korea (대한조선학회)
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Propeller Wake Measurement of a Model Ship in Self Propulsion Condition using Towed Underwater PIV

입자영상유속계를 이용한 자항상태 모형선의 프로펠러 후류 계측

  • Seo, Jeonghwa (Dept. of Naval Architectrure and Ocean Engineering, Seoul National University) ;
  • Yoo, Geuk Sang (Dept. of Naval Architectrure and Ocean Engineering, Seoul National University) ;
  • Lim, Tae Gu (Dept. of Naval Architectrure and Ocean Engineering, Seoul National University) ;
  • Seol, Dong Myung (Naval Ship Engineering Division, Naval Force Analysis Test & Evaluation, Republic of Korea Navy) ;
  • Han, Bum Woo (Hyundai Maritime Research Institute) ;
  • Rhee, Shin Hyung (Dept. of Naval Architectrure and Ocean Engineering, Seoul National University)
  • 서정화 (서울대학교 조선해양공학과) ;
  • 유극상 (서울대학교 조선해양공학과) ;
  • 임태구 (서울대학교 조선해양공학과) ;
  • 설동명 (해군 전력분석시험평가단 함정기술처) ;
  • 한범우 (현대중공업 선박연구소) ;
  • 이신형 (서울대학교 조선해양공학과)
  • Received : 2013.10.22
  • Accepted : 2014.03.04
  • Published : 2014.04.20
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Abstract

A two-dimensional particle image velocimetry (2D PIV) system in a towing tank is employed to measure a wake field of a very large crude oil carrier model with rotating propeller in self propulsion condition, to identify characteristics of wake of a propeller working behind a ship. Phase-averaged and time-averaged flow fields are measured for a horizontal plane. Scale ratio of the model ship is 1/100 and Froude number is 0.142. By phase-averaging technique, trajectories of tip vortex and hub vortex are identified and characteristic secondary vortex distribution is observed in the hub vortex region. Propeller wake on the starboard side is more accelerated than that on the port side, due to the difference of inflow of propeller blades. The hub vortex trajectory tends to face the port side. With the fluctuation part of the phase-averaged velocity field, turbulent kinetic energy (TKE) is also derived. In the center of tip vortex and hub vortex region, high TKE concentration is observed. In addition, a time-averaged vector field is also measured and compared with phase-averaged vector field.

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References

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