Cavitation Inception for a Two-Dimensional Half Body in a Uniform Stream with a Free Surface and a Solid Bottom.

摘要

The flow field of two-dimensional half body generated by a single line source located in a uniform flow with a free surface and a solid bottom were calculated by the method of images. The influence of the trajectories and radial dynamics of entrained gas bubbles on cavitation inception for such a half body with free surface and bottom effect were then calculated. It was found that for the distance from the body to the free surface, D, and the distance to the bottom, S, greater than 16 times the ultimate body half width, h, the presence of the free surface and the bottom do not have an appreciable effect on the flow field of interest as compared to the infinite flow case. Results for the incipient cavitation number as a function of body sizes and visible bubble radii for various free stream maximum entrained gas bubble radii are presented for D/h = S/h = 16 and the free stream velocity U - 25 fps. (Author)