대형선망어구에 사용되는 무결절 망지의 종류별 유체역학적 특성 연구
Hydrodynamic characteristics of knotless nettings for large purse seine gear
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초록
이 연구에서는 대형선망어구에서 사용되는 13개 종류의 망지의 항력계수와 양력계수를 도출하여 이전의 연구들과 비교하여 선망어구로서의 유체역학적 특성을 연구하였다. 발의길이(l)와 직경(d)이 각각 다른 13개 종류의 망지가 실험에 사용되었다. 항력계수(Cd)는 d/l의 증가에 따라 커졌고, 0.4m/s 유속에서는 Cd=3.71499(d/l)+0.76595, 0.5m/s 유속에서는 Cd=4.30324(d/l)+0.69056 으로 표현할 수 있다. 비슷한 d/l의 무결절망지 실험인 이전의 연구결과와 이 연구결과를 비교하면, 저항계수의 값은 비슷했고, 결절망지의 실험보다는 이 연구의 저항계수 값이 작았다. 그러므로 선망에서 무결절망지를 사용하는 것은 선망어구에 작용하는 저항을 줄이는 측면에서 이점이 있다.
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 (Cd) also increased with increasing d/l. It can be expressed as Cd= 3.71499(d/l)+0.76595 at a current speed 0.4 m/s and Cd 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.
참고문헌 (14)
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