Accession Number : AD0721375

Title :   An Experimental Study of the Effects of Waves on the Ventilation of Surface-Piercing Struts.

Descriptive Note : Final rept. Nov 69-Oct 70,

Corporate Author : LOCKHEED MISSILES AND SPACE CO SUNNYVALE CALIF

Personal Author(s) : Kramer,Ray L.

Report Date : NOV 1970

Pagination or Media Count : 65

Abstract : An experimental program was conducted to investigate the effects of waves on ventilation inception for two surface-piercing strut models of one-foot chord length. The majority of tests were conducted with a strut model of leading edge radius equal to 1.82 percent of the chord length. Tests were performed in head and following waves and at 8 and 10 degrees yaw. Low ambient pressures were utilized to obtain ventilation inception in the presence of cavitation in the Froude number range 2.5 to 5. Exploratory tests were also conducted with a strut model with a sharp leading edge. The effects on ventilation inception under the various wave conditions were compared on the basis of cavitation number required for ventilation inception. For the blunt-leading-edge strut at a Froude number of 3.2, the cavitation number was increased by a factor of up to two for ventilation in waves. The magnitude of the wave influence decreased as the Froude number was increased until at a Froude number of 5 a factor of up to 1.3 was obtained. For the sharp-leading-edge strut, ventilation inception occurred at greatly increased cavitation numbers of five to ten time those for calm water. (Author)

Descriptors :   (*CAVITATION, SUPPORTS), (*WATER WAVES, VENTILATION), HYDRODYNAMICS, HYDRODYNAMIC CONFIGURATIONS, MODEL TESTS, SURFACES

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE