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Effect of amplitude and mean angle-of-attack on the boundary layer of an oscillating aerofoil

机译:振幅和平均攻角对振荡翼型边界层的影响

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Extensive experiments were conducted to study the effect of various parameters on the surface pressure distribution and transition point of an aerofoil section used in a wind turbine blade. In this paper details of the variation of transition point on the aforementioned aerofoil are presented. The aerofoil spanned the wind-tunnel test section and was oscillated sinusoidally in pitch about the quarter chord. The imposed variables of the experiments were free stream velocity, amplitude of motion, mean angle-of-attack, and oscillation frequency.rnThe spatial-temporal progressions of the leading-edge transition point and the state of the unsteady boundary-layer were measured using eight closely-spaced, hot-film sensors (HFS). The measurements show that:rn(ⅰ) Reduced frequency has a pronounced effect on the variations of the transition point.rn(ⅱ) There exists a hysteresis loop in the dynamic transition location and its shape varies with the reduced frequency and mean angle-of-attack.
机译:进行了广泛的实验,以研究各种参数对风力涡轮机叶片中翼型截面的表面压力分布和转变点的影响。在本文中,详细介绍了上述机翼上转变点的变化。机翼跨过风洞测试段,并在四分之一弦附近以正弦波形式振荡。实验施加的变量是自由流速度,运动幅度,平均攻角和振荡频率。rn使用扫描仪测量了前沿转变点的时空进程和不稳定边界层的状态。八个紧密排列的热膜传感器(HFS)。测量结果表明:rn(ⅰ)降低频率对过渡点的变化有显着影响.rn(ⅱ)在动态过渡位置存在磁滞回线,其形状随降低的频率和平均角度的变化而变化。 -攻击。

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