【作者】 刘宏伟； 赵云鹏； 毕春伟；

【Author】 LIU Hong-wei;ZHAO Yun-peng;BI Chun-wei;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology;

【机构】 大连理工大学海岸和近海工程国家重点实验室；

【摘要】 拖网网板是拖网作业中保持网口水平扩张的主要渔具构件,本研究利用CFD软件FLUENT对不同展弦比网板其水动力性能进行了数值模拟。研究中设计了2种不同展弦比λ的网板,在流速1.54m/s,迎流冲角α=0°⁵0°时,建立数值水槽进行数值模拟,得到网板的阻力系数C_d、升力系数C₁、俯仰力矩系数C_m和升阻比K,对比不同网板的水动力性能差异。结果显示,1号网板（λ=2.0）与2号网板（λ=1.5）的最大升力系数分别为0.85（α=15°）和0.92（α=42°）;最大升阻比分别为9.59和8.35,俯仰力矩系数的绝对值分别为0.013和0.001。结果表明展弦比越大,临界冲角和C₁值越小,最大升阻比越高,但稳定性越差。研究结果可为拖网网板的结构优化设计提供参考。更多还原

【Abstract】 The otter board is a vital component for the efficient expansion performance of an otter trawl system.The numerical CFD code ANSYS Fluent was conducted for rectangular otter board model to study the effect of aspect ratio on hydrodynamic performance.2 different kinds of aspect ratio of otter boards were numerical simulated using the FLUENT with the flow velocity at 1.54 m/s and the angle of attack measured from 0° to 50°.The calculated drag coefficient C_d,lift coefficient C_l,pitching moment coefficient C_m. lift to drag ratio K and the relations curve of these value and angle of attack were compared.The results showed that the maximum lift coefficient of otter boards 1 and 2 was 0.85(α =15°) and 0.92(α =42°),the maximum lift to drag ratio was 9.59 and 8.35,and the absolute value of pitching moment coefficient was 0.013 and0.001 respectively.The result indicated that the greater the aspect ratio,the smaller the critical angle of attack and lift coefficient,the higher the maximum lift to drag ratio,but the worse of stability.The results would provide reference for the structural optimization design of trawl otter board.更多还原