Effect of aspect ratio on hydrodynamic performance of high lift otter board in trawl fisheries

2018 2nd International Workshop on Renewable Energy and Development

能源学;经济学

Liu, Jian^1,2,3 ; Huang, Hong Liang^1,2,3 ; Chen, Shuai^1,2,3

East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai

200090, China^1

Engineering Technology Research Center of Marine Fishing, Chinese Academy of Fishery Sciences, Shanghai

200090, China^2

Key Laboratory of Oceanic and Polar Fisheries, Ministry of Agriculture, Shanghai

200090, China^3

关键词: Bottom trawls;    Comparative analysis;    Critical angles;    Expansion efficiency;    Hydrodynamic performance;    Lift coefficient;    Lift to drag ratio;    Trawl fisheries;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/153/3/032034/pdf
DOI  :  10.1088/1755-1315/153/3/032034

来源: IOP

【 摘 要 】

Otter board is one of the main component in the production of single boat trawl fisheries. For improving the expansion performance of trawl net in middle-water trawl fisheries, an improved high lift otter board was developed. A flume model experiment was conducted to measure the lift coefficient (CL), drag coefficient (CD) and lift to drag ratio (K) in different angle of attack. The experimental results are as follows: (1) The aspect ratio has significant influence on the max lift coefficient (CLmax), the max lift to drag ratio (Kmax), critical angle of attack (0) and lift to drag ratio at 0 (P2.053 and K>1.578. The mean value of lift coefficient was 2.356 and the mean of lift to drag ratio was 2.329. Through comparative analysis of the hydrodynamic performance of different types of otter boards, the H2 otter board both had good expansion performance and good expansion efficiency, which can provide a reference basis for further optimization of the bottom trawl otter board.