Experimental Investigation Of The Vortex Shedding In The Wake Of Oblique And Blunt Trailing Edge Hydrofoils Using Piv-Pod

This paper presents an experimental investigation of the vortex shedding in the wake of blunt and oblique trailing edge hydrofoils at high Reynolds number, Re=5 10(5) - 2.9 10(6). The velocity field in the wake is surveyed with the help of Particle-Image-Velocimetry, PI V, using Proper-Orthogonal-Decomposition, POD. Besides, flow induced vibration measurements and high-speed visualization are performed. The high-speed visualization clearly shows that the oblique trailing edge leads to a spatial phase shift of the upper and lower vortices at their generation stage, resulting their partial cancellation. For the oblique trailing edge geometry and in comparison with the blunt one, the vortex-induced vibrations are significantly reduced. Moreover, PIV data reveals a lower vorticity for the oblique trailing edge. The phase shift between upper and lower vortices, introduced by the oblique truncation of the trailing edge, is found to vanish in the far wake, where alternate shedding is recovered as observed with the blunt trailing edge. The phase shift generated by the oblique trailing edge and the resulting partial cancellation of the vortices is believed to be the main reason of the vibration reduction.

Published in:
Proceedings Of The Asme Fluids Engineering Division Summer Meeting - 2010 - Vol 3, Pts A And B, 149-154
Presented at:
7th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, and Flow-Induced Vibration and Noise, Montreal, CANADA, Aug 01-05, 2010
American Soc Mechanical Engineers, Three Park Avenue, New York, Ny 10016-5990 Usa

 Record created 2012-06-25, last modified 2018-09-13

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