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http://dx.doi.org/10.3796/KSFT.2017.53.3.228

Hydrodynamic characteristics of knotless nettings for large purse seine gear  

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)
Publication Information
Journal of the Korean Society of Fisheries and Ocean Technology / v.53, no.3, 2017 , pp. 228-239 More about this Journal
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.
Keywords
Purse seine gear; Knotless net; Drag coefficient; Lift coefficient; Resistance;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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