The effect of the main-panel angle of a single-slotted cambered otter-board was investigated using engineering models in a wind tunnel. Three different angles (0°, 6°, and 12°) were evaluated at a wind speed of 28?m/s. Parameters measured included: drag coefficient C x, lift coefficient C y, pitch moment coefficient C m, center of pressure coefficient C p, and the lift–drag ratio C y/ C x, over a range of angle of attack (0°–70°). These coefficients were used in analyzing the differences in the performance among the three otter-board models. Results showed that the maximum lift coefficient C y of the otter-board model with a main-panel angle of 0° was highest (1.875?at α?=?25°). However, when the angle of attack was smaller (0?y/ C x of the otter-board with a main-panel angle of 12° was highest (7.417?at α?=?2.5°), and the lift–drag ratio increased when the angle of the main-panel increased within the angle of attack at small angles (0?m and C p showed that the stability of the otter-board with a main-panel angle of 0° is better than those of the other models. Therefore, the comparative analysis of C m and C p, shows that a larger angle of the main-panel can reduce the stability of single-slotted otter-board. The findings of this study offer useful reference data for the structural optimization of otter-boards for trawling.
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机译：在风洞中使用工程模型研究了单槽弧面水獭板的主面板角度的影响。以28？m / s的风速评估了三个不同的角度（0°，6°和12°）。测得的参数包括：阻力系数C x ，升力系数C y ，俯仰力矩系数C m ，压力中心C p ，以及在一定迎角范围（0°–70°）内的升阻比C y / C x 。这些系数用于分析三种水獭板模型之间的性能差异。结果表明，主面板角度为0°的水獭板模型的最大升力系数C y 最高（α？=？25°，1.875？）。但是，当迎角较小时，主面板角为12°的水獭板的迎角为0？y / C x 最高（α？= 7.417°）。 ？2.5°），并且当主面板的角度在小角度（0？m 和C p ）的迎角之内增加时，升阻比增加。主面板角度为0°的水獭板的稳定性优于其他模型，因此，对C m 和C p 进行了比较分析，结果表明，较大角度的主面板会降低单槽水獭板的稳定性，该研究结果为拖网水獭板的结构优化提供了有用的参考数据。
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