Study of the Bed Velocity Induced by Twin Propellers
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 143, Issue 5
Abstract
Twin propellers without a rudder were studied using a physical model with a fixed clearance distance and three different rotating velocities. Experimental results were compared with results from theoretical expressions developed over the past 50 years for the efflux velocity, axial velocity, and maximum bed velocity. It was found that the efflux velocity equations overestimated the experimental results, whereas the computed axial velocities matched the experimental data reasonably well. However, when maximum bed velocity expressions were compared with experimental results, only one method was found to behave better; overestimation resulted if a quadratic superposition of single jets was used.
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Acknowledgments
We greatly acknowledge the technical staff of the UPC CIEMLAB for their support throughout the experiments: Joaquim Sospedra, Òscar Galego, Ricardo Torres, and Aleix Jaquet. This work has been supported by the Ministerio de Economía y Competitividad (MINECO) and the Unión Europea-Fondo Europeo de Desarrollo Regional Una Manera de hacer Europa (FEDER) of the Spanish government through project ProFeSion TRA2015-70473-R.
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Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 143 • Issue 5 • September 2017
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This work is made available under the terms of the Creative Commons Attribution 4.0 International license, http://creativecommons.org/licenses/by/4.0/.
History
Received: May 2, 2016
Accepted: Oct 28, 2016
Published online: Apr 11, 2017
Published in print: Sep 1, 2017
Discussion open until: Sep 11, 2017
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