Abstract
In order to estimate a pressure drag force acting on an axisymmetric body of revolution located on the axis of a tube, a slender cone where it is easy to find a separation point is used as a body. Both the case where the blockage ratio (the ratio of maximum cross sectional area of body to cross sectional area of tube) is small and it is large are analyzed with a cavity model of open type by a slender body theory. Drag force coefficients and cavitation numbers are calculated. According to the result, when the blockage ratio is large, the drag force coefficients are hardly influenced by the forms of the cavity, and they become very large as the blockage ratio increases.
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