两种立式曲面V型网板水动力性能的实验研究

Model test of the hydrodynamic characteristics of two vertical cambered V type otter boards

为比较两种立式曲面V型网板的水动力性能,该文通过水槽模型实验测量网板阻力xF、升力yF,计算了网板的阻力系数DC、升力系数LC和升阻比K。结果表明:LC和K随冲角?的增大呈先升后降趋势,DC随冲角的增大呈上升趋势;当冲角??30o时,1号网板升力系数最大值LmaxC?1.509,此时DC?0.686,K?2.198;冲角??20o时,升阻比最大值maxK?2.892,此时LC?1.158,DC?0.400;当冲角??30o时,2号网板升力系数最大值LmaxC?1.603,此时DC?0.765,K?2.095;冲角??15o时,升阻比最大值maxK?2.555,此时LC?1.013,DC?0.397。根据实验结果,建议网板的最佳工作冲角范围为15o–30o,此时1号网板升力系数LC?0.8且升阻比K?2.0,2号网板升力系数LC?1.0且升阻比K?2.0。此外,不同冲角下,1号网板升阻比大于2号网板,具有较高的扩张效率,冲角为10o–30o时,2号网板的升力系数大于1号网板,表明其具有较高的扩张性能。

To compare the hydrodynamic performance of two low aspect ratio vertical cambered V type otter boards, a flume model experiment was conducted to measure the resistance Fx and lift force Fy of model otter board, then calculated the dragcoefficient CD, lift coefficient CL and lift to drag ratio K. The experimental results are as follows： Parameters CL and K show a trend of first increasing and then decreasing with the increase of angle of attack α, CD reflects an upward trend with the increase of angle of attack; For No. 1 otter board, when α= 30°, the maximum lift coefficient CLmax of No. 1 otter board is 1.509, in this case CD=0.686, K=2.198. When α=20°, the maximum lift to drag ratio Kin,x is 2.892, in this case CL = 1.158, CD = 0.400; For No.2 otter board, when α= 30°, CLmax= 1.603, in this case CD= 0.765, K = 2.095. When α= 15°, Kmax = 2.555, in this case CL = 1.013, CD = 0.397. According to above-mentioned results, the best suggesting work scope of angle of attack is between 15°-30°, in which case, for No.1 otter board CL 〉 0.8 and K 〉 2.0; for No.2 otter board CL 〉 1.0 and K 〉 2.0. The K value and expansion efficiency of No.1 otter board are higher than No.2 otter board under each angle of attack. The CL value and expansion efficiency of No.2 otter board are higher than No. 1 otter board in the range of 10°-30°.