Research Papers: Flows in Complex Systems

Performance Improvement of Weis-Fogh Type Ship’s Propulsion Mechanism Using a Wing Restrained by an Elastic Spring

[+] Author and Article Information
Kideok Ro

Department of Mechanical System Engineering, Institute of Marine Industry, Gyeongsang National University, 445 Inpyeong-dong, Tongyeong, Gyeongnam 650-160, Republic of Korearokid@gaechuk.gsnu.ac.kr

J. Fluids Eng 132(4), 041101 (Mar 29, 2010) (6 pages) doi:10.1115/1.4001155 History: Received November 22, 2008; Revised January 30, 2010; Published March 29, 2010; Online March 29, 2010

This study was conducted in an attempt to improve the hydrodynamic performance of a Weis-Fogh type ship propulsion mechanism by installing a spring to the wing so that the opening angle of the wing can be changed automatically. With the prototype design, the average thrust coefficient was almost fixed with all velocity ratios; but with the spring type, the thrust coefficient was increased sharply as the velocity ratio increased. The average propulsive efficiency was higher with a bigger opening angle in the prototype but in the spring type design, the one with a smaller spring coefficient had higher efficiency. In the case of velocity ratios over 1.5 where big thrust can be generated, the spring type had more than twice the increase in propulsion efficiency compared with the prototype.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 7

Time variations for thrust and drag coefficients (V/U=1.0)

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Figure 8

Average thrust and drag coefficients with velocity ratio

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Figure 9

Average thrust and drag coefficients with velocity ratio

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Figure 10

Average thrust and drag coefficients with velocity ratio

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Figure 11

Average propulsive efficiency with velocity ratio for wings of various types

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Figure 1

A model of propulsion mechanism

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Figure 2

Driving unit of the wing (unit: mm)

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Figure 3

Structure of the wing and shaft (unit: mm)

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Figure 4

Definition of thrust and drag

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Figure 5

Variations for opening angle with the position of wing in a stroke for elastic wings of spring type

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Figure 6

Calibrations of thrust and drag




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