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Experimental study of the effect of drift angle on a ship-like foil with varying aspect ratio and bottom edge shape

机译：漂移角对长宽比和底边形状变化的船状箔的影响的实验研究

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A ship-like foil geometry with different aspect ratios and bottom edge shapes are tested experimentally with several drift angles (0-10 degrees), and two Froude numbers (0.1 and 0.2). The geometry is a modified version of the foil Eppler E836 that is extruded in the span direction to make it a 3D geometry. The aspect ratios are 0.1, 0.2 and 03. Two different bottom edge shapes are tested: a perfectly sharp bottom edge and a rounded bottom edge. Lift, drag and yaw moment is measured. The result is presented both as raw data and data fitted polynomial functions. The experimental results are compared to simplified models for lifting surfaces, along with some discussion regarding the physics of a drift-induced forces. The simplified models do not fit the experimental data very well, but the comparison is used to discuss the importance of different physical effects. The result from the experiments show that both the aspect ratio and the shape of the bottom edge is very important. Froude number effects on lift and lift-induced drag are seen to be very small, for the two Froude numbers tested in this experiment, while the yaw moment and center of pressure is affected. (C) 2016 Elsevier Ltd. All rights reserved.
机译：实验测试了具有不同长宽比和底部边缘形状的船形箔几何形状，并通过几个漂移角（0-10度）和两个弗劳德数（0.1和0.2）进行了实验。该几何图形是箔Eppler E836的修改版本，它在跨度方向上进行了拉伸以使其成为3D几何图形。长宽比分别为0.1、0.2和03。测试了两种不同的底部边缘形状：完美锐利的底部边缘和圆形底部边缘。测量升力，阻力和偏航力矩。结果以原始数据和数据拟合多项式函数形式表示。将实验结果与举升表面的简化模型进行了比较，并对漂移引起的力的物理原理进行了一些讨论。简化的模型不能很好地拟合实验数据，但是通过比较可以讨论不同物理效应的重要性。实验结果表明，纵横比和底部边缘的形状都非常重要。对于本实验中测试的两个弗洛德数，弗洛德数对升力和升力引起的阻力的影响很小，而偏航力矩和压力中心受到影响。 （C）2016 Elsevier Ltd.保留所有权利。

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