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http://dx.doi.org/10.3744/SNAK.2011.48.3.233

Experimental Study on the Vortical Flow Behind 2-D Blade with the Variation of Trailing Edge Shape  

Paik, Bu-Geun (Maritime & Ocean Engineering Research Institute, KORDI)
Kim, Ki-Sup (Maritime & Ocean Engineering Research Institute, KORDI)
Moon, Il-Sung (Maritime & Ocean Engineering Research Institute, KORDI)
Ahn, Jong-Woo (Maritime & Ocean Engineering Research Institute, KORDI)
Publication Information
Journal of the Society of Naval Architects of Korea / v.48, no.3, 2011 , pp. 233-237 More about this Journal
Abstract
In the present experiments, vortical structures behind the hydrofoil trailing edge are visualized and analyzed as an elementary study for propeller singing phenomena. Two sorts of hydrofoil are selected for the measurement of shedding vortices. One was KH45 hydrofoil section and the other is KH45 with the truncated trailing edge that is positioned at X/C = 0.9523(C=chord length). Assuming the Strouhal number of 0.23, the shedding frequencies of vortices are extracted by analyzing the boundary layer thickness and the flow speed. The frequency distribution of shedding vortices is obtained with the variation of angle-of-attack while the flow speed is fixed to 8m/s. The truncation of the trailing edge makes the frequency of shedding vortices about 120Hz lower than that of original trailing edge and makes the vorticity value higher than the original trailing edge.
Keywords
Hydrofoil; Singing; Shedding frequency; Trailing edge; Angle of attack; PIV(particle image velocimetry);
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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