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Tomasz Neumann
 

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TransNav, Faculty of Navigation
Gdynia Maritime University
3, John Paul II Avenue
81-345 Gdynia, POLAND
www http://www.transnav.eu
e-mail transnav@am.gdynia.pl
Cavitation of a Propeller and Influence of an Wake Equalizing Duct
1 Constanta Maritime University, Constanța, Romania
ABSTRACT: The wake equalizing duct (WED) is one of the most commonly used energy saving devices for improving the propulsion performance of a ship; and reducing the propeller-excited vibrations and viscous resistance forces. During the last three decades considerable research and development activities have taken into place within this context. Most of these devices are used to improve propulsive efficiency, but some of them aims to improve other performance characteristics, such as cavitations, vibration, noise, maneuverability, etc. Marine propellers are the most common propulsion systems; nevertheless, it is possible to improve its propulsive performance using additional auxiliary propulsor devices (unconventional propulsors). Two versions of an existing ship in normal version and fitted with WED device were analyzed in order to demonstrate the influence on the WED device on the propeller cavitations . It was determined that the values for the pressure coefficient is 1.98 for without WED situation and 2.029 for WED situation. The difference is not so significant that, the conclusion is that WED device did not have influence over the cavitations of the propeller. Either optimization of dimension and form of WED did not help in reducing negative effects of cavitations. Not being a study in this paperwork, to decrease the cavitations we have other choices including a sound design of the propeller biased to improve the propeller behavior in cavitations. WED is clearly not a choice.
REFERENCES
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Friesch J., C. Johannsen, Propulsion optimization tests at high Reynolds numbers, SNAME Transactions 102, 1994, pp. 1–21.
Heinke H.J., K. Hellwig-Rieck, Investigation of Scale Effects on Ships with a Wake Equilizing Duct or with Vortex Generator Fins, Second International Symposium on Marine Propulsors, Hamburg, Germany, 2011.
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ITTC 1999, Final report of the specialist committee on unconventional propulsors, 22nd International Towing Tank Conference, Seoul, Korea and Sanghai, China, 1999.
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Citation note:
Martinas G.: Cavitation of a Propeller and Influence of an Wake Equalizing Duct. TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation, Vol. 9, No. 2, doi:10.12716/1001.09.02.11, pp. 235-241, 2015

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