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Effect of wingtip flow on hydrodynamic characteristics of cambered otter board
Ocean Engineering ( IF 5 ) Pub Date : 2021-01-23 , DOI: 10.1016/j.oceaneng.2021.108611
Xinxing You , Fuxiang Hu , Xin Zhuang , Shuchuang Dong , Daisuke Shiode

The hydrodynamic characteristics of cambered otter boards with a camber ratio of 15% and aspect ratios of 0.5, 1.0, 1.5, and 2.0 were investigated through flume tank experiments and CFD analysis for the cases in which the wingtips were blocked or unblocked. In the blocked wingtip case, the maximum lift coefficient, stall angle, and lift slope (α: 0° to 15°) were approximately 1.75, 15°, and 0.115 (deg−1), respectively, regardless of the aspect ratio. Comparatively, in the unblocked wingtip case, maximum lift coefficients were 1.74 (stall angle: 40°), 1.65 (35°), 1.54 (25°), and 1.50 (20°), and the lift slope increased from 0.063 to 0.097 (deg−1) as the aspect ratio increased from 0.5 to 2.0. The drag coefficients for all unblocked wingtip models were larger for all considered angles of attack. The effect of the wingtip flow formed around the otter board on the hydrodynamic characteristics was visualized using CFD analysis. A small-scale wingtip plate with a width of 0.1c was designed. Particularly, for boards with aspect ratios of 1.0–1.5 and a 0.1c wingtip plate, lift slopes and maximum lift coefficients approached those for the blocked wingtip cases, and stall angles were close to those for the unblocked wingtip cases.



中文翻译:

翼尖流量对水獭弯板水动力特性的影响

通过水槽实验和CFD分析,研究了翼弯比为15%,纵横比为0.5、1.0、1.5和2.0的弧形水獭板的水动力特性。在翼尖堵塞的情况下,无论长宽比如何,最大升力系数,失速角和升力斜率(α:0°至15°)分别约为1.75、15°和0.115(deg -1)。相比之下,在无阻碍的翼尖情况下,最大升力系数为1.74(失速角:40°),1.65(35°),1.54(25°)和1.50(20°),升力斜率从0.063增加到0.097(度-1)随着纵横比从0.5增加到2.0。对于所有考虑的迎角,所有无阻塞翼尖模型的阻力系数都较大。使用CFD分析可以看到水獭板周围形成的翼尖流动对水动力特性的影响。设计了一个宽度为0.1 c的小型翼尖板。尤其是,对于长宽比为1.0–1.5且翼尖板为0.1 c的板,升力斜率和最大升力系数接近封闭翼尖情况下的升力斜率和最大升力系数,失速角接近于非封闭翼尖情况下的失速角。

更新日期:2021-01-24
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