Abstract
A stereoscopic PIV (Particle Image Velocimetry) technique has been employed to measure the 3 dimensional flow structure of turbulent wake behind a marine propeller with 5 blades. The out-of-plane velocity component was measured using particle images captured simultaneously by two CCD cameras installed in the angular displacement configuration. 400 instantaneous velocity fields were acquired for each of four different blade phases of 0°, 18°, 36° and 54°. They were ensemble averaged to investigate the spatial evolution of propeller wake in the near wake region up to one propeller diameter (D) downstream. The phase-averaged velocity fields show clearly the viscous wake formed by the boundary layers developed along both surfaces of the blade. Tip vortices were generated periodically and the slipstream contraction occurs in the near-wake region. The out-of-plane velocity component has large values at the locations of tip and trailing vortices. With going downstream, the axial turbulence intensity and the strength of tip vortices were decreased due to the viscous dissipation, turbulence diffusion and blade-to-blade interaction. The difference in the mean velocity fields measured by SPIV and 2-D PIV methods was about 5% ≈ 10%. However, the 2-D PIV results also give sufficient information on propeller wake beyond the region of X/D=0.2.
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Sang Joon Lee: He received his master and Ph.D. in Mechanical Engineering from KAIST (Korea Advanced Institute of Science and Technology) in 1982 and 1986, respectively. In 1986 he worked as a senior researcher at KIMM. He is currently a professor in the Department of Mechanical Engineering at POSTECH after joining as an assistant professor in 1987. His research interests are quantitative flow visualization (PIY, PTY, LIF, Holography), experimental fluid mechanics, bluff body aerodynamics, microfluidics and flow control.
Bu Geun Paik: He received his master degree in Physics in 1995 from POSTECH and worked as a research engineer in Samsung Shipbuilding Company, He is a Ph.D. student at POSTECH and his research interests are ship hydrodynamics and turbulence control.
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Lee, S.J., Paik, B.G. Stereoscopic PIV measurements of flow around a marine propeller. J Vis 7, 25–32 (2004). https://doi.org/10.1007/BF03181482
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DOI: https://doi.org/10.1007/BF03181482