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TECHNICAL PAPERS

Experimental Analysis of the Near Wake from a Ducted Thruster at True and Near Bollard Pull Conditions Using Stereo Particle Image Velocimetry (SPIV)

[+] Author and Article Information
S. El Lababidy, N. Bose

 Memorial University of Newfoundland (MUN), Canada

P. Liu

 Institute for Ocean Technology (IOT), Canada

D. Walker

 Oceanic Consulting Cooperation, Canada

F. Di Felice

 Italian Ship Model Basin (INSEAN), Italy

J. Offshore Mech. Arct. Eng 127(3), 191-196 (Mar 03, 2005) (6 pages) doi:10.1115/1.1951770 History: Received August 26, 2004; Revised March 03, 2005

Thrusters working at low advance coefficients are employed in a wide range of offshore and marine applications on Floating, Production, Storage, and Offloading (FPSO) systems; shuttle tankers; tug boats; and mobile offshore units. Therefore, an understanding of the flow around the thrusters is of great practical interest. Despite this interest, there is lack of knowledge in the description of the hydrodynamic characteristics of a ducted thruster’s wake at bollard pull and low advance coefficient values. This work was aimed at providing detailed data about the hydrodynamic characteristics of a Dynamic Positioning (DP) thruster near wake flow at different low advance coefficient values. Wake measurements were made during cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments, the DP thruster near wake velocity components at different downstream axial planes, up to 1.5 diameters downstream, were obtained using a Stereoscopic Particle Image Velocimetry (SPIV) system. These experiments were carried out at different advance coefficient (J) values [bollard pull (J=0), J=0.4 and J=0.45].

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 5

Ducted DP thruster near wake total turbulence distribution at different J

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Figure 6

Ducted DP thruster near wake vorticity distribution at different J

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Figure 1

DP thruster model and SPIV in the INSEAN large cavitation tunnel

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Figure 2

Coordinate system. The mesh of the propeller and the nozzle were generated using PROPELLA (19)

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Figure 3

Circumferential variation of velocity components around the ducted DP thruster at different J at X∕D=0.4

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Figure 4

Ducted DP thruster near wake velocity components evolution at different J

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