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

  • 제36권3호
  • /
  • Pages.15-21
  • /
  • 1999
  • /
  • 1225-1143(pISSN)
  • /
  • 2287-7355(eISSN)
대한조선학회 (The Society of Naval Architects of Korea)
권호 표지

KRISO 300K VLCC 이중모형선의 유동특성에 대한 풍동실험 연구

Wind Tunnel Study on Flow Characteristics around KRISO 300K VLCC Double-body Model

  • 김학록 (포항공과대학교 첨단유체공학연구센터) ;
  • 이상준 (포항공과대학교 기계공학과)
  • 발행 : 1999.08.01
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초록

KRISO 300K VLCC 이중모형선 주위의 유동특성을 풍동실험을 통해 연구하였다. 선체 선미 주위유동과 후류유동의 평균속도 성분, 난류강도, 레이놀즈 전단응력 및 난류 운동에너지 분포를 열선풍속계를 이용하여 측정하였다. 실험은 선미와 후류의 횡단면에서 수행하였으며, 선체 표면에서의 유동 패턴을 정성적으로 조사하기 위하여 유막법을 이용한 유동가시화도 수행하였다. 선미와 근접 후류영역은 매우 복잡한 3차원의 유동특성을 가지고 있으며, 특히 종방향 와류영역에서 고리 모양의 후류 구조를 볼 수 있었다. 그리고 중앙평행부에서의 얇은 경계층은 선미 영역을 지나며 점차 두꺼워지고 복잡한 3차원 난류후류로 발전하였다.

The flow characteristics around KRISO 300K VLCC double-body model have been experimentally investigated in a closed-type subsonic wind tunnel. The local mean velocity and turbulence statistics including turbulent intensity. Reynolds shear stress and turbulent kinetic energy were measured using a x-type hot-wire probe. The measurements were carried out at several transverse stations of the stern and near wake regions. The surface flow was visualized using on oil-film technique to see the flow pattern qualitatively. The flow in the stern and near wake region revealed complicated three-dimensional flow characteristics. The VLCC model shows a hook-shaped wake structure behind the propeller boss in the main longitudinal vortex region. The thin boundary layer at midship was increased gradually in thickness over the stern and evolved into a full three-dimensional turbulent wake.

키워드

참고문헌

  1. Hot-Wire Anemometry Bruun, H. H.
  2. Proc. 18th ITTC v.1 Report of the Resistance and Flow Committee ITTC
  3. Journal of Ship Research v.14 Wind Tunnel Test of Two Lucy Ashton Reflex Geosims Joubert, P. N.;Matheson, N.
  4. Proc. Osaka Int. Colloq. Ship Viscous Flow On the Structure of the Flow Field on Ship Hulls Knaack, T.;Kux, J.;Wieghardt, K.
  5. SSPA. Gothenburg, Sweden, Report No. 46 Boundary Layers of Ships, Part III : An Experimental Investigation of the Turbulent Boundary Layer on a Ship Model Larsson, L.
  6. Experiments in Fluids v.8 Mean-flow and Turbulence measurements in the Boundary Layer and Wake of a Ship Double Model Patel, V. C.;Sarda, O. P.
  7. Iowa Institute of Hydraulic Research, University of Iowa, IIHR Report No. 326 Measurements in the Stern and Wake flow of a Series 60 Ship With and Without a Propeller Toda, Y. (et al.)