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http://dx.doi.org/10.3744/SNAK.2006.43.1.059

Experimental Study on the Structure of Tip Vortex Generated by an Oscillating Rectangular Hydrofoil  

Hyun, Beom-Soo (Korea Maritime University)
Kim, Moo-Rong (Korea Maritime University)
Publication Information
Journal of the Society of Naval Architects of Korea / v.43, no.1, 2006 , pp. 59-67 More about this Journal
Abstract
Evolution of the unsteady three-dimensional tip vortex in the wake field of a rectangular NACA 0012 hydrofoil in pitching motion is investigated. Measurements were made in CWC using PIV. A hydrofoil has an aspect ratio of 5 with chord length of 1 Oem. Pitching angle and mean angle of attack were set to $\pm$ $5^{\circ}$ and $10^{\circ}$, respectively. Frequency of oscillation was varied from 0.1 Hz to 1 Hz in order to study the effect of unsteadiness imposed by various frequencies, which correspond to the reduced frequency of K=0.1, 0.21, 0.52 and 1.05. Reynolds number based on chord length and free-stream velocity was $30\times$$10^{4}$ Phase-averaging technique was employed. Unsteadiness and variation of the size and characteristics of tip vortex at different reduced frequency were discussed.
Keywords
PIV; Reduced frequency; Oscillating hydrofoil; Tip vortex; Phase-averaging; Unsteadiness;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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