Measurements of the Time Dependent Velocity Field Surrounding a Model Propeller in Uniform Water Flow,
HAMBURG MODEL BASIN (GERMANY F R)
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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 propellerss 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 propellers 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.
- Fluid Mechanics
- Marine Engineering