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학제간연구 과학기술학 뇌인지과학 기술정책 기타 복합학

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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국수산해양기술학회(구한국어업기술학회) 수산해양기술연구 수산해양기술연구 제47권 제4호
발행연도
2011.1
수록면
281 - 289 (9page)

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초록· 키워드

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The purpose of this study is to identify the flow resistance of the bottom trawl net. The bottom trawl net being used in the training ship of Chonnam National University was selected as a full-scale net, and model nets such as 1/10, 1/25 and 1/50 of the actual net were made. Total resistance of the net part, the height of the net mouth and the flow resistance of components of the net such as wing, bag and cod-end part was measured, converted into full-scale and compared. Additionally, the model rule of Tauti (1934), which has been most frequently used in fishing net modeling experiments, was applied to interpret flow resistance and scale effect of model experiment was investigated. Presumed that the flow resistance R is R〓kSu 2 against the flow velocity of each net u , resistance coefficient k was calculated by substituting R, u and S of the net. From the result, it was found that k decreases exponentially when u increases which makes k=cu －m. Whereas m of each net is ranged between 0.13－0.16 and there was not significant difference between nets. c does not show big difference in 1/10 and 1/25 model and the value itself was relatively bigger than in 1/50model. The height of the net mouth of 1/25 and 1/50 model net h decreases exponentially according as u increases to make h=du －n. Whereas d and n values were almost same in two nets. Additionally, when resistance of cod-end, wing and bag part in 1/25 and 1/50 model nets, both nets showed big resistance in bag part when flow is 1m/s as more than 60%. Wing and cod-end part showed almost same value or wing part had little bit larger value. On the other hand, when reviewing the reasons why both models showed difference in 1/50 model while c value against the resistance coefficient k did not show big difference in 1/10 and 1/25 model, it is inferred that the difference occurred not from material difference but from the difference in net size according to scale. It was judged that they are the scale effects concomitant to the model experiments.
#Flow resistance #Model net #Model rule #Resistance coefficient #Scale effect

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참고문헌 (13)

참고문헌 신청
Cho, B.K / 2000 / A study on the bottom trawl gear by the trial of a stern trawler (Ⅰ) On the resistance of bottom trawl gear / J. Kor. Soc. Fish. Tech 36 (4) : 274 ~ 280 google schola Dickson, W. / 1959 / 1959. The use of model nets as a method of developing trawling gear, Modern fishing gear of world 1 / Fishing News : 166 ~ 174 google schola Fridman,A.L. / 1973 / Theory and design of commercial fishing gear (Translated from Russian) / Israel programs for scientific translations : 122 ~ 191 google schola Kim, D.A / 1999 / Fishing gear design / Pyeonghwa painting co. Ltd : 140 ~ 182 google schola Kim, D.A. / 1995 / Flow resistance and modeling rule of fishing nets (Ⅱ), Flow resistance of bag nets / J. Kor. Fish. Soc 28 (2) : 194 ~ 201 google schola

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