摘要
利用风洞模型试验研究单缝曲面网板模型，通过改变叶板尺度比例对单缝曲面网板其水动力性能变化进行了考察.试验中采用了3种不同叶板尺度比例的模型网板，在风速28m／s，冲角（α）范围0°～70°时，利用塔式六分量机械一应变天平对网板所受到的阻力、升力和力矩进行了测量，通过换算得到网板的阻力系数Cx、升力系数Cy俯仰力矩系数Cm、压力中心系数Gp和升阻比Cy／Cx，对比各系数的变化分析各模型网板的水动力性能差异.结果显示，2号与3号模型网板的最大升力系数更高，分别为1．919（α=30°）和1．911（α=30°）,导流板尺度比例较小的1号与2号模型网板的最大升阻比较高，分别为5．991（α=10°）和5．994（α=12．5°），且2号模型网板的作业冲角选择范围较大；在稳性对比方面，导流板尺度比例较小的1号模型网板的Gp变异系数最低，为6．02％，说明1号模型网板的稳性更好.研究结果可为拖网网板的结构优化设计提供参考.
The effect of the vane length on hydrodynamic performances of single slotted cambered otter board was investigated by wind tunnel model test, The aspect ratios of three model otter boards are 2.5 and their surface curvature are 12%. Vane angles remain unchanged and projected area of otter boards is 0. 158 m2. By changing different vane lengths, the influence of length proportion between deflector and main panel for single slotted otter board on hydrodynamic performances was discussed. The model test conducted in wind tunnel with the flow velocity at 28 m/s and the angle of attack measured from 0° to 70°. Model experiment was conducted to obtain drag coefficients Cx, lift coefficient Cy, pressure-center coefficient Cp, calculated lift to drag ratio Cy/Cx and give the relations curve of these value and angle of attack. The results showed that the lift coefficient Cy of model otter boards 2 and 3 were higher, which were 1.919 （or =30°） and 1. 911 （α =30°） respectively; the Cy/Cx of otter boards 1 and 2 with shorter deflector were be higher, which were 5. 911 （α = 10°） and 5. 994 （α = 12.5°） , respectively, and the range of working angle of attack of otter boards 2 was wider; for comparison in stability of otter board, the variable coefficient Cp of model otter boards 1 with shorter deflector was 6.02%, which showed that the stability of otter board 1 was better. The results would provide reference for the structural optimization design of trawl otter board,
出处
《渔业现代化》
北大核心
2015年第6期55-60,共6页
Fishery Modernization
基金
国家科技支撑计划项目(2013BAD13B03)
关键词
拖网网板
叶板尺度
单缝曲面网板
风洞试验
水动力性能
trawl door
vane dimension
single slotted cambered otter board
wind tunnel test
hydrodynamicperformances
