Reducing fuel usage and CO2 emissions from tug boat fleets: sea trials and theoretical modelling
Reducing fuel usage and CO2 emissions from tug boat fleets: sea trials and theoretical modelling
Sea trials on a harbour tug have been conducted and are explained. The experimental results for fuel consumption per unit transport effort, under free-running (transiting) conditions, are presented and engine speed-propulsor pitch combinations for improved fuel economy are identified. A simplified analytical approach to predict fuel consumption, including the coupled engine-propulsor-hull system, is described. This rationale is combined with experimental observations and, consequently, performance maps present the complete operating envelopes of the harbour tug under both free-running and towing conditions. This combined approach proved to be effective and can be applied to the study of other tug vessels. As a consequence of this research, the engine control system on the harbour tug was modified to permit it to operate fully within the region of best fuel economy during free-running. The results from the bollard-pull predictions provide insight for the design and operation of harbour tugs in the future.
A31-A41
Murphy, A.J.
8e021dad-0c60-446b-a14e-cddd09d44626
Weston, S.J.
3e36e92a-bfbb-4249-aaee-7f13aa0086ec
Young, R.J.
220c9e6b-b310-44f4-bc22-3730eaae1643
January 2012
Murphy, A.J.
8e021dad-0c60-446b-a14e-cddd09d44626
Weston, S.J.
3e36e92a-bfbb-4249-aaee-7f13aa0086ec
Young, R.J.
220c9e6b-b310-44f4-bc22-3730eaae1643
Murphy, A.J., Weston, S.J. and Young, R.J.
(2012)
Reducing fuel usage and CO2 emissions from tug boat fleets: sea trials and theoretical modelling.
Transactions of The Royal Institution of Naval Architects Part A: International Journal of Maritime Engineering, 154 (A1), .
(doi:10.5750/ijme.v154iA1.873).
Abstract
Sea trials on a harbour tug have been conducted and are explained. The experimental results for fuel consumption per unit transport effort, under free-running (transiting) conditions, are presented and engine speed-propulsor pitch combinations for improved fuel economy are identified. A simplified analytical approach to predict fuel consumption, including the coupled engine-propulsor-hull system, is described. This rationale is combined with experimental observations and, consequently, performance maps present the complete operating envelopes of the harbour tug under both free-running and towing conditions. This combined approach proved to be effective and can be applied to the study of other tug vessels. As a consequence of this research, the engine control system on the harbour tug was modified to permit it to operate fully within the region of best fuel economy during free-running. The results from the bollard-pull predictions provide insight for the design and operation of harbour tugs in the future.
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Published date: January 2012
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Funding Information:
The authors would like to thank the tug crews and Svitzer for their support and assistance for this research.
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Local EPrints ID: 484066
URI: http://eprints.soton.ac.uk/id/eprint/484066
ISSN: 1479-8751
PURE UUID: 66178666-6ed8-4ba0-9f9e-309773387936
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Date deposited: 09 Nov 2023 18:06
Last modified: 17 Mar 2024 13:35
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Author:
A.J. Murphy
Author:
S.J. Weston
Author:
R.J. Young
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