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Resistance reduction through air layer formation beneath a vessel

Air bubble lubrication system is one of the techniques for ship energy saving in lowering ship frictional resistance. Air lubrication technique can reduce the skin friction using air layer or artificial air cavity generated beneath a vessel by air injection. This research presents the study on resis...

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Main Author: Jaafar, Fatimah Amirah
Format: Thesis
Language:English
Published: 2015
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utm.my/id/eprint/53516/1/FatimahAmirahJaafarMFKM2015.pdf
http://eprints.utm.my/id/eprint/53516/
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spelling my.utm.535162020-07-16T07:51:13Z http://eprints.utm.my/id/eprint/53516/ Resistance reduction through air layer formation beneath a vessel Jaafar, Fatimah Amirah TJ Mechanical engineering and machinery Air bubble lubrication system is one of the techniques for ship energy saving in lowering ship frictional resistance. Air lubrication technique can reduce the skin friction using air layer or artificial air cavity generated beneath a vessel by air injection. This research presents the study on resistance reduction on a displacement hull model with microbubble generated beneath the vessel. Microbubble barriers were made in order to trap the generated microbubble more effectively beneath the vessel model. The subject of the study was a tanker model (MTL 036) with main dimension: L = 2.956 m, B = 0.436 m and T = 0.174 m. Resistance test was carried out at Marine Technology Centre, Universiti Teknologi Malaysia. The experiment conducted in two different conditions: resistance test without microbubble and resistance test with microbubble. The model was towed using the towing carriage and the resistance force (x-axis) and side force (y-axis) were recorded from 0.704 m/s to 1.14 m/s (equivalent to 10 knots to 16 knots in full scale). The model test results show that the total resistance with microbubble is lowered by 6 % to 13.9 % at the speed of 0.704 m/s and 0.849 m/s. The rate of resistance reduction decreases when the speed of the model increases. The highest resistance reduction was obtained at the speed of 0.849 m/s where 13.9 % reduction in resistance is achieved. The micro-bubble barriers are found to be able to effectively trapped the air beneath the model and reduce the total resistance effectively. 2015-06 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/53516/1/FatimahAmirahJaafarMFKM2015.pdf Jaafar, Fatimah Amirah (2015) Resistance reduction through air layer formation beneath a vessel. Masters thesis, Universiti Teknologi Malaysia, Faculty of Mechanical Engineering. http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:84592
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Jaafar, Fatimah Amirah
Resistance reduction through air layer formation beneath a vessel
description Air bubble lubrication system is one of the techniques for ship energy saving in lowering ship frictional resistance. Air lubrication technique can reduce the skin friction using air layer or artificial air cavity generated beneath a vessel by air injection. This research presents the study on resistance reduction on a displacement hull model with microbubble generated beneath the vessel. Microbubble barriers were made in order to trap the generated microbubble more effectively beneath the vessel model. The subject of the study was a tanker model (MTL 036) with main dimension: L = 2.956 m, B = 0.436 m and T = 0.174 m. Resistance test was carried out at Marine Technology Centre, Universiti Teknologi Malaysia. The experiment conducted in two different conditions: resistance test without microbubble and resistance test with microbubble. The model was towed using the towing carriage and the resistance force (x-axis) and side force (y-axis) were recorded from 0.704 m/s to 1.14 m/s (equivalent to 10 knots to 16 knots in full scale). The model test results show that the total resistance with microbubble is lowered by 6 % to 13.9 % at the speed of 0.704 m/s and 0.849 m/s. The rate of resistance reduction decreases when the speed of the model increases. The highest resistance reduction was obtained at the speed of 0.849 m/s where 13.9 % reduction in resistance is achieved. The micro-bubble barriers are found to be able to effectively trapped the air beneath the model and reduce the total resistance effectively.
format Thesis
author Jaafar, Fatimah Amirah
author_facet Jaafar, Fatimah Amirah
author_sort Jaafar, Fatimah Amirah
title Resistance reduction through air layer formation beneath a vessel
title_short Resistance reduction through air layer formation beneath a vessel
title_full Resistance reduction through air layer formation beneath a vessel
title_fullStr Resistance reduction through air layer formation beneath a vessel
title_full_unstemmed Resistance reduction through air layer formation beneath a vessel
title_sort resistance reduction through air layer formation beneath a vessel
publishDate 2015
url http://eprints.utm.my/id/eprint/53516/1/FatimahAmirahJaafarMFKM2015.pdf
http://eprints.utm.my/id/eprint/53516/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:84592
_version_ 1674066174225154048
score 13.211869

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