Design and fabrication of fluid flow characteristic controllable trawl door using a trailing edge flap

A novel trawl door with a trailing edge flap and a trawl door with a hydrophobic surface are proposed to improve the hydrodynamic characteristics of trawl doors. In the former, the flap angle was designed to accommodate rapid changes in water flow velocity, increase the lift force under low-speed co...

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Published inJournal of mechanical science and technology Vol. 33; no. 12; pp. 5623 - 5630
Main Authors Lee, Jiwon, Yoon, Hongkeun, Park, Yeonju, Choi, Kyusuk, Lee, Chunwoo, Shim, Dosik, Park, Sanghu
Format Journal Article
LanguageEnglish
Published Seoul Korean Society of Mechanical Engineers 01.12.2019
Springer Nature B.V
대한기계학회
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ISSN1738-494X
1976-3824
DOI10.1007/s12206-019-1103-6

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Summary:A novel trawl door with a trailing edge flap and a trawl door with a hydrophobic surface are proposed to improve the hydrodynamic characteristics of trawl doors. In the former, the flap angle was designed to accommodate rapid changes in water flow velocity, increase the lift force under low-speed conditions, and decrease drag force under high-speed conditions. An evaluation of the hydrodynamic characteristics at different flap angles was conducted through numerical analyses and experimentation. The design of the trawl door with coated hydrophobic surface aims to reduce flow resistance. Both trawl door designs were validated in a circulating water channel ex-periment. At these angles of the trailing edge flap, a 31 % decrement in drag force was observed in the circulating water channel experi-ment, and a 21.3 % decrement in flow resistance was observed when the surface of the trawl door was coated with hydrophobic surface materials.
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ISSN:1738-494X
1976-3824
DOI:10.1007/s12206-019-1103-6