Hydrodynamic characteristics of the double-winged otter board in the deep waters of the Mauritanian Sea -- Journal of Oceanology and Limnology,2018,36(4):1417-1424

	Cite this paper:
	SU Xin, LU Huosheng, FENG Bo, CHEN Qiujie, YAN Yunrong. Hydrodynamic characteristics of the double-winged otter board in the deep waters of the Mauritanian Sea[J]. Journal of Oceanology and Limnology, 2018, 36(4): 1417-1424

Hydrodynamic characteristics of the double-winged otter board in the deep waters of the Mauritanian Sea

SU Xin¹, LU Huosheng^1,2,3, FENG Bo^1,2,3, CHEN Qiujie¹, YAN Yunrong^1,2,3

1 College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, China;
2 Center of South China Sea Fisheries Resources Monitoring and Assessment, Guangdong Ocean University, Zhanjiang 524088, China;
3 Guangdong Provincial Engineering and Technology Research Center of Far Sea Fisheries Management and Fishing of South China Sea, Guangdong Ocean University, Zhanjiang 524088, China

Abstract:

In this paper, we tested the hydrodynamic characteristics of a new, double-winged otter board that consists of a forewing, a leading edge slat and a trailing edge flap. Flume experiments were conducted in a circulating flume tank by using a model with an aspect ratio (AR) of 0.85 and a horizontal planform area (S) of 0.09 m². The results indicated that the critical angle (α_cr) of the model was 44°, whereas the maximum lift coefficient (C_Lmax) was up to 1.715, and the door efficiency (K) was 1.122. The attack angle (α) ranged from 30° to 48° and from 10° to 46° when the lift coefficient (C_L) and door efficiency (K) were greater than 1.2 and 1.0, respectively. To compare the difference between double-winged otter board and traditional Morgere Polyvalent Ovale, same model of Morgere Polyvalent Ovale was also tested under the same experimental conditions. The critical angle (α_cr) and maximum of lift coefficient (C_Lmax) of the doublewinged otter board were 37.5% and 14.6% larger than those of the Morgere Polyvalent Ovale. Therefore, we concluded that the novel, double-winged otter board was more suitable for bottom trawling fisheries in the deep water of the Mauretania Sea due to its better hydrodynamic characteristics and stability.

Key words: Mauretania|deep waters|bottom trawl|double-winged otter board|flume experiment

Received: 2017-02-21 Revised:

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