모형실험과 수치해석을 이용한 저항 저감형 중층 트롤어구의 성능 해석
Performance analysis of a low drag generated idwater trawl using the models experiments and the numerical analysis
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초록
최근 수산업에서 지구온난화를 유발하는 온실가스에 대한 관심이 증대되어 온실가스 감축에 대한 많은 연구가 진행되고 있다. 특히 트롤과 같은 예인 어구의 경우, 예망시 유체 저항으로 유류소모량에 영향을 많이 주고 있어 유체저항을 줄일 필요가 있다. 따라서 본 연구에서는 현용 1400마력급 중층 대형 트롤의 유체 저항을 감소시키고자 어구 설계의 개선을 통하여 저저항형 중층 트롤 어구를 제시하고자 한다. 모형어구와 시뮬레이션 방법을 통하여 현용 어구와 저저항형 어구의 저항, 망고, 망폭을 유속별로 분석하였으며, 본 연구에서 제시한 저저항형 어구의 경우 현용어구 대비 저항이 29% 감소하였으며, 망구 면적 또한 증가하여 어구 성능은 개선됨과 동시에 에너지도 절감할 수 있는 것으로 분석되었다. 따라서 향후 보다 친환경적이며 효율적으로 어업에 도움이 될 수 있을 것으로 판단된다.
Abstract
Fuel consumption in fisheries is a primary concern due to environmental effects and costs to fishermen. Much research has been carried out to reduce the fuel consumption related to fishing operations. The fuel consumption of fishing gear during fishing operation is generally related to hydrodynamic resistance on the gear. This research is to propose a low drag generated midwater trawl in terms of the gear design improvement using simulations. The results from the simulation were verified with results that mirrored the model experiments. From the results, the resistance force of the proposed gear is decreased as 29% compared to that of the current gear. Furthermore, the gear performance is also improved with increased gear mouth compared to the current one. Therefore, the proposed gear will be helpful to reduce the greenhouse gases from the fishing operation. It will also contribute to the fishing industry by saving the fuel.
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