Accession Number : ADP005906

Title :   Measurements of the Time Dependent Velocity Field Surrounding a Model Propeller in Uniform Water Flow,

Corporate Author : HAMBURG MODEL BASIN (GERMANY F R)

Personal Author(s) : Blaurock, Joerg ; Lummers, Gerd

Report Date : JUN 1987

Pagination or Media Count : 14

Abstract : The flow field around an operating ship propeller was investigated in a water tunnel, using Laser-Doppler-velocimetry. The three-dimensional velocity field was measured in three planes on the pressure side of the propeller at the design thrust coefficient of K sub T = 0.185. In one of the planes in the propellers's slipstream, the measurements were repeated at thrust coefficients of K sub T = 0.12 and K sub T = 0.25. The velocity profiles measured in the propeller's slipstream are compared with the induced velocities derived from design calculations, and occurring deviations are discussed. Furthermore, the instationary flow field allows one to study the tip vortices at different distances behind the propeller load at the blade tips on geometry and intensity of the tip vortices cna be seen.

Descriptors :   *WATER FLOW, *MARINE PROPELLERS, FLOW FIELDS, SLIPSTREAM, VELOCITY, WATER TUNNELS, MODEL TESTS, THREE DIMENSIONAL, THRUST, BLADE TIPS, VORTICES, PROPELLER BLADES, LASER VELOCIMETERS, DOPPLER SYSTEMS, TIME DEPENDENCE, WEST GERMANY.

Subject Categories : Fluid Mechanics
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE