To provide experimental data on the hydrodynamic characteristics and features of dynamic positioning (DP) thrusters under variable operating conditions, wake measurements were performed on a DP thruster model using 2D laser Doppler velocimetry (LDV) and stereoscopic particle image velocimetry (SPIV). These tests were performed with and without a nozzle and over a range of advance coefficient values including the bollard pull condition. In this paper, a detailed analysis of the hydrodynamic characteristics of the wake at a plane equal to a distance of 0.5 diameters downstream from the thruster, at advance coefficient values of 0, 0.4, and 0.45 are presented for both the LDV and SPIV measurements showing a comparison between the results of each technique. The effect of the duct and of changes in the advance coefficient values is presented in this paper.

Issue Section:
Technical Papers
Keywords:
wakes, propulsion, laser velocimetry, nozzles, hydrodynamics, pipe flow
Topics:
Flow (Dynamics), Nozzles, Propellers, Wakes, Blades, Tunnels, Turbulence, Cavitation
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Copyright © 2006
 by American Society of Mechanical Engineers
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