Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Hydrodynamic characteristics of knotless nettings for large purse seine gear

대형선망어구에 사용되는 무결절 망지의 종류별 유체역학적 특성 연구

  • KANG, Da-Young (Fisheries Engineering Division, National Institute of Fisheries Science) ;
  • KIM, Hyun-Young (Fisheries Engineering Division, National Institute of Fisheries Science) ;
  • KOO, Myeong-Seong (Fisheries Engineering Division, National Institute of Fisheries Science) ;
  • LEE, Chun-Woo (Division of Marine Production System Management, Pukyong National University) ;
  • CHA, Bong-Jin (Fisheries Engineering Division, National Institute of Fisheries Science)
  • 강다영 (국립수산과학원 수산공학과) ;
  • 김현영 (국립수산과학원 수산공학과) ;
  • 구명성 (국립수산과학원 수산공학과) ;
  • 이춘우 (부경대학교 해양생산시스템관리학부) ;
  • 차봉진 (국립수산과학원 수산공학과)
  • Received : 2017.06.27
  • Accepted : 2017.08.21
  • Published : 2017.08.31
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Abstract

This study investigated the drag coefficient and lift coefficient of thirteen kinds of knotless nettings used for large purse seine gear. By comparing the hydrodynamic characteristics with nets of the previous study, the characteristics of this study were derived as a purse seine gear. Thirteen kinds of nettings with different length of bar (l) and diameter (d) were used in the experiment, out of which six kinds used the 30 mm in mesh size and three kinds with 40 mm. The drag coefficient ($C_d$) also increased with increasing d/l. It can be expressed as $C_d=3.71499(d/l)+0.76595$ at a current speed 0.4 m/s and $C_d=4.30324(d/l)+0.69056$ at a current speed 0.5 m/s. Compared with previous studies, drag coefficient values were similar to knotless net of similar d/l and smaller than drag coefficient of knot net. Therefore, using knotless net in a purse seine has the advantage of reducing the resistance acting on the purse seine gear.

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References

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