한국가시화정보학회:학술대회논문집
- 한국가시화정보학회 2005년도 추계학술대회 논문집
- /
- Pages.54-57
- /
- 2005
선박 모형의 하중 (loading)조건 및 Reynolds 수의 변화에 따른 선미 반류의 PIV 속도장 측정
PIV Measurements of Hull Wake behind a Container Ship Model with Varying Loading Condition and Reynolds number
- 발행 : 2005.12.01
초록
Flow characteristics of hull wake behind a container ship model were investigated experimentally with varying loading condition and Reynolds number. Large-scale bilge vortices of nearly the same strength are formed in the near-wake region. They are symmetric and counter-rotating with respect to the wake centerline for all loading conditions tested. With going downstream for both design and ballast loading conditions, the strength of the bilge vortices decreases and the wake region expands due to diffusion and viscous dissipation. Under the design loading condition, the bilge vortices start to appear at St=0.363 transverse plane above the propeller-boss. For the ballast loading condition, however, the bilge vortices start to appear at St=0.591 below the propeller-boss. They move upward as the hull wake goes downstream and Reynolds number increases. These wake characteristics, under the ballast loading condition, may weaken the propulsion and cavitation performances of the propeller, which are usually optimized for the design loading condition.