Accession Number : AD0634319

Title :   CAVITATION INCEPTION ON THREE-DIMENSIONAL ROUGHNESS ELEMENTS.

Descriptive Note : Research and development rept.,

Corporate Author : DAVID TAYLOR MODEL BASIN WASHINGTON D C HYDROMECHANICS LAB

Personal Author(s) : Benson, Bruce W.

Report Date : MAY 1966

Pagination or Media Count : 36

Abstract : Cavitation inception velocities have been measured for the flow over three-dimensional roughness elements, embedded in a boundary layer on a flat plate, in the 36-inch water tunnel at the David Taylor Model Basin. The roughness elements considered are right circular cylinders, cones, and hemispheres whose heights vary from one-thirty-second to three-forths of an inch. Cavitation inception number, based on tunnel velocity, is plotted as a function of the ratio of roughness height to boundary layer thickness. This resulted in separate curves for each test velocity. When, however, the cavitation number was computed on the basis of the velocity within the boundary layer at the tip of the roughness, the cavitation number was found to be primarily a function of the local Reynolds number, based on roughness height and local velocity. Of the three roughness geometries, the cylinders produced the largest cavitation numbers; the hemispheres, the smallest. (Author)

Descriptors :   (*CAVITATION, *HYDRODYNAMIC CONFIGURATIONS), ROUGHNESS, BOUNDARY LAYER

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE