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《Ship Engineering》 2006-04
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Problems in drag measuring test of non-streamlined underwater body

LIU Yu-qiu, ZHANG Jia-zhong, YU Kai-ping (College of Astronautics, Harbin University of Technology, Harbin 150001, China)  
In high-speed water tunnel, drag tests of the underwater body model under natural and artificial ventilated conditions are carried out separately, and the numerical simulation is used to analyze the effect of tail support, drag components and scale effect. The result shows that the drag of the non-streamlined body under natural condition is greatly increased compared with that of the streamlined body. The pressure drag is the main component. When the artificial ventilated supercavity is formed, the drag is greatly decreased. The measuring drag is larger because of the tail support. Under natural condition, the drag coefficient of the original body is smaller than that of the model, and under artificial ventilated condition they are almost equal.
【CateGory Index】: U661.7
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