文章摘要
立式双曲面网板水动力性能及流场可视化研究
The hydrodynamic performance and flow field visualization of biplane-type otter board
投稿时间:2019-08-11  修订日期:2019-12-28
DOI:
中文关键词: 立式双曲面网板 水动力性能 水槽试验 数值模拟 流场可视化
英文关键词: the biplane-type otter board  the hydrodynamic performance  tank model test  numerical simulation  flow field visualization
基金项目:国家自然科学基金项目(41806110);农业农村部南极海洋生物资源开发利用项目(D8002-17-0109);上海市青年科技英才杨帆计划资助(19YF1419800)
作者单位E-mail
刘志强 上海海洋大学 lzhiqiang716@126.com 
许柳雄 上海海洋大学  
唐浩 上海海洋大学 htang@shou.edu.cn 
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中文摘要:
      网板是拖网作业系统中重要的属具之一,其水动力性能的优劣直接关系到拖网网口的扩张,并影响其生产效果和经济效益。立式双曲面网板因高升力的优点,被广泛用于日本沿岸中层拖网渔业中。作者采用单因素试验法,利用水槽模型试验和数值模拟(Computational Fluid Dynamics,CFD)研究立式双曲面模型网板在不同展弦比 λ(2.5、3、3.5、4)、弯曲度f(10%、15%、20%)、后退角Λ(0°、10°、15°)下的水动力性能,分析不同结构参数的网板水动力性能,对比两种方法的结果,并实现网板周围流场可视化。结果显示:(1)2号网板(λ=3、f=15%、Λ=10°)升力系数最大,冲角25°时,模型试验值为1.7,数值模拟值为1.88,阻力系数随冲角增大一直增大,且后部流速的模拟值和测定值平均偏差为4.4%,两种方法获得的结果吻合度高(P<0.01)。(2)2号网板在流场分布中边界层分离点随冲角增大逐渐向翼端前沿移动,中心面后部涡旋随冲角增大一直增大,左翼板侧低压区随冲角增大呈先增大后减小趋势,网板尾部随冲角增大形成明显的翼端涡,产生涡升力对网板提供附加升力,使得立式双曲面网板比其他类型网板有较高升力。本研究结果对开发网板或优化网板性能均有参考价值。
英文摘要:
      The otter board is one of the important attachments in the trawl operation system, the hydrodynamic performance is directly related to the expansion of the trawl mouth and affects its production effect and economic benefits. The biplane-type otter board are widely used in the mid-layer trawl fishery in the Japan coast due to the high lift. The author used the single factor test method to study the hydrodynamic performance of the biplane-type model otter boards using the tank model test and numerical simulation (Computational Fluid Dynamics, CFD) with different aspect ratios λ (2.5、3、3.5、4)、camber ratio f (10%、15%、20%) and sweepback angle Λ (0°、10°、15°), analyze the hydrodynamic performance of the otter boards with different structural parameters, compare the results of the two methods, and visualize the flow field around the otter board. The results show: (1) The No.2 otter board (λ=3、f=15%、Λ=10°) has the highest lift coefficient when the angle of attack is 25°, the model experiment value is 1.7, the simulation value is 1.88, and the drag coefficient increases with the increase of the angle of attack, the average deviation of the simulated and measured values of the flow velocity at the back is 4.4%, and the results obtained by the two methods are highly consistent (P<0.01). (2) In the flow field distribution, the separation point of the boundary layer of the No.2 otter board moved with the increase of the angle of attack and gradually moved to the leading edge of the fore wing, the rear vortex of the central plane increase with the increase of the angle of attack, the left side low pressure zone increases first and then decreases with the increase of the angle of attack, the tail of the otter board increases with the angle to form a distinct wing tip vortex, which produces vortex lift to provide additional lift to the otter board, making the biplane type have higher lift than other types otter board. The results of this study have reference value for the development of the otter board or optimized otter board performance.
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