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TECHNICAL PAPERS

Detailed Analysis of the Wake of a DP Thruster Emphasizing Comparison Between LDV and SPIV Techniques

[+] Author and Article Information
S. El Lababidy

 InCoreTec InCorporated, Canada

N. Bose

 Memorial University of Newfoundland, Canada

P. Liu

 Institute for Ocean Technology National Research Council Canada, Canada

F. Di Felice

 Italian Ship Model Basin (INSEAN), Italy

J. Offshore Mech. Arct. Eng 128(2), 81-88 (Nov 04, 2005) (8 pages) doi:10.1115/1.2185680 History: Received March 07, 2005; Revised November 04, 2005

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.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 10

SPIV DP thruster wake total turbulence distribution at J=0.4 and at X∕D=0.5

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Figure 11

SPIV vorticity (s−1) distribution with and without the nozzle at J=0.4 and at X∕D=0.5

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Figure 4

DP thruster model and SPV in the INSEAN large cavitation tunnel

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Figure 5

The INSEAN cavitation tunnel cross-sectional view

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Figure 6

Coordinate system. The mesh of the propeller and the nozzle were generated using PROPELLA (see Ref. 16).

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Figure 7

Circumferential variation of velocity components around the DP thruster: at J=0.4 and J=0.45 and at X∕D=0.5 using LDV

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Figure 8

Circumferential variation of velocity components around the DP thruster: at J=0.4 and J=0.45 and at X∕D=0.5 using SPIV

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Figure 9

Comparison between the LDV and SPIV circumferential variation of the axial velocity component around the DP thruster; at J=0.4 and J=0.45 and at X∕D=0.5

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Figure 1

The IOT cavitation tunnel cross-sectional view

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Figure 2

The arrangement of the LDV probe positions

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Figure 3

Radial measurements planes

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