Accession Number : ADA195879

Title :   Propeller Wake Flow Visualization Near a Free Surface.

Descriptive Note : Technical rept.,

Corporate Author : DAVID TAYLOR RESEARCH CENTER BETHESDA MD SHIP HYDROMECHANICS DEPT

Personal Author(s) : Fish, Scott ; Blanton, James N

PDF Url : ADA195879

Report Date : Jun 1988

Pagination or Media Count : 26

Abstract : Propeller wake flow visualization was carried out for several depths of submergence below a free surface. The wake was visualized by laser light sheet illumination of the blade tip vortex helix seeded with fluorescein dye. Instability in the helix was apparent at much shorter distances downstream than has previously been observed in cavitation experiments. Effects of the free surface on the propeller wake were seen at the shallower submergence depths. Select video frames are presented with preliminary comments. A more complete analysis will follow ina later report. Keywords: Marine propeller wake; Vortex helices; Propeller blades; Flow visualization. (edc)

Descriptors :   *FLOW VISUALIZATION, *MARINE PROPELLERS, *WAKE, CAVITATION, DEPTH, ILLUMINATION, LASER BEAMS, PROPELLER BLADES, PROPELLERS, SHEETS, UNDERWATER, VIDEO FRAMES

Subject Categories : Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE