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《Ship Engineering》 2006-03
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Experimental study of the drag reduction of ventilated supercavity of underwater bodies

WANG Hai-bin, ZHANG Jia-zhong, WEI Ying-jie, WANG Cong, YU Kai-ping, JIA Li-ping (School of Astronautics, Harbin University of Technology, Harbin 150001, China)  
In order to explore the drag reduction of supercavity and guarantee forming supercavity in lower velocity, experiments of the ventilated supercavity of underwater bodies have been performed in cavitation tunnel. Supercavities have been formed by using the method of ventilation in lower velocity. By changing ventilation volume and Froude number, a series of supercavity lengths have been obtained in different conditions and drag coefficients of model at different cavity lengths are gained. The experimental investigation shows that, at constant velocity, the supercavity length increases with the increase of ventilation volume and the drag coefficient of model increases initially and then begins to reduce with the increase of the cavity length. The cavitator diameter largely influences the drag coefficient which, under the condition of large Froude number, begins to increase with the increase of ventilation rate because of too large cavitator diameter. Numerical simulation of supercavity shape and drag coefficient has been made by using the commercial software, and the results fit well with the experimental results.
【CateGory Index】: U661.7
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