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Research Papers: Ocean Engineering

Model Test of Influence of Propeller Arrangements Aboard a Four Propeller Boat

[+] Author and Article Information
J. Y. Bi

e-mail bijunying@gmail.com

Z. Zong

School of Naval Architecture Engineering,
Faculty of Vehicle Engineering and Mechanics,
State Key Laboratory of Structural Analysis for Industrial Equipment,
Dalian University of Technology,
Dalian 116024, PRC

1Corresponding author.

Contributed by the Ocean Offshore and Arctic Engineering Division of ASME for publication in the Journal of Offshore Mechanics and Arctic Engineering. Manuscript received March 21, 2011; final manuscript received August 31, 2012; published online February 25, 2013. Assoc. Editor: Thomas Fu.

J. Offshore Mech. Arct. Eng 135(2), 021101 (Feb 25, 2013) (9 pages) Paper No: OMAE-11-1029; doi: 10.1115/1.4023201 History: Received March 21, 2011; Revised August 31, 2012

Although it is not uncommon to employ four propellers on a high speed displacement vessel, there is a lack of literature on this subject. This paper presents the propulsive performance of a four-propeller craft and gives the influence of propeller arrangements on the propulsive performance. According to the rotation direction, the transverse and longitudinal positions of four propellers, five factors are designed as the possible influential factors and 18 propeller arrangements are selected depending on the Taguchi orthogonal array. In fact, there are only 15 self-propulsion tests because the outer and inner propellers are overlapped in the same longitudinal position. The results of the model tests indicate that the influence of the hull form is negligible for high-speed craft because the frictional wake is small. In order to solve the problem of three missing self-propulsion tests, an unbalanced analysis of variance (ANOVA) is adopted. The propulsive efficiency, propeller thrust, and torque are considered as response variables in order to explore the importance of each factor. The order of importance is also obtained to provide designers with valuable guidance information.

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Copyright © 2013 by ASME
Topics: Propellers , Thrust , Torque
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References

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Figures

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Fig. 1

The possible transverse arrangements of four propellers

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Fig. 2

The possible longitudinal arrangements of four propellers

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Fig. 4

Thrust and torque coefficients of the outer and inner propellers

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Fig. 5

Total thrust and torque coefficients of 15 propeller arrangements

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Fig. 6

Mean wake fractions of 15 propeller arrangements

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Fig. 7

Effective wake fractions of the outer and inner propellers

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Fig. 8

Mean relative rotative efficiencies of 15 propeller arrangements

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Fig. 9

Relative rotative efficiencies of the outer and inner propellers

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Fig. 10

Mean thrust-deduction coefficients of 15 propeller arrangements

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Fig. 11

Mean propulsive efficiencies of 15 propeller arrangements

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