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High porosity net drag at a low angle of attack in application to a representative prawn trawl
conference contribution
posted on 2023-05-23, 06:51 authored by Balash, C, Neil Bose, Jonathan BinnsJonathan Binns, Sterling, DThe presented work investigated the extent by which Reynolds number determines the drag coefficient for high porosity nets at a low angle of attack. A simple prawn trawl model that incorporates the main design features of prawn trawls employed in Australia was developed. Four trawl models of various high porosities were tested in a flume tank with respect to drag and shape over a range of flow velocities. The physical trawl model was analysed as a system of independent plane net sheets, each with an orientation to the flow estimated from analysis of stereo-vision data. The main finding was that the drag coefficient was weakly dependent on the Reynolds number in the range typical for prawn trawl operations, 1000<Re<1700. These combined findings imply that trawler operators can approximately estimate prawn net drag from a function containing trawl twine area, towing speed and spread ratio.
History
Publication title
Proceedings of the 31st International Conference on Ocean, Offshore and Arctic EngineeringVolume
7Editors
WL KuehnleinPagination
1-6ISBN
978-0-7918-4494-6Department/School
Australian Maritime CollegePublisher
American Society for Mechanical Engineers (ASME)Place of publication
Rio de Janeiro, Brazil (CD-Rom)Event title
31st International Conference on Ocean, Offshore and Arctic Engineering (OMAE31)Event Venue
Rio de Janeiro, BrazilDate of Event (Start Date)
2012-07-01Date of Event (End Date)
2012-07-06Rights statement
Copyright 2012 ASMERepository Status
- Restricted