矩形曲面网板水动力性能的数值模拟  

Numerical Simulation on Hydrodynamic Performance of Rectangular Otter Boards with Different Aspect Ratios

作　　者：刘圣聪 刘佳茗 Liu Shengcong et al(Dalian Tianzheng Industrial Co. Ltd, Dalian 116001, China)

机构地区：[1]大连天正实业有限公司,辽宁大连116001 [2]庄河市步云山乡人民政府,辽宁庄河116001

出　　处：《安徽农学通报》2017年第18期92-94,108,共4页Anhui Agricultural Science Bulletin

基　　金：现代农业产业技术体系专项资金资助(CARS-50)

摘　　要：拖网网板为网衣提供水平张力,是拖网作业系统非常重要的渔具构件之一。该文利用CFD软件FLUENT研究了展弦比对矩形曲面网板其水动力性能的影响。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Cd、升力系数Cl、俯仰力矩系数Cm和升阻比K,对比不同网板的水动力性能差异。结果表明,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。可见,展弦比越大,临界冲角和Cl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。The otter hoard 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 1.54m/s and the angle of attack measured from 0° to 50°. The cal-culated drag co- efficient Cd, lift coefficient Cm, pitching moment coefficient Cm, 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 and 0.001 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.

关 键 词：拖网网板 展弦比 水动力学性能 数值模拟 

分 类 号：S141[农业科学—肥料学]