In the high pressure wind tunnel (HochDruckkanal Goettingen [HDG]) of Deutsch–Niederländische Windkanäle—German–Dutch Wind Tunnels (DNW) a 47% thick airfoil‐like symmetrical profile was investigated at a high (3 to 12 million) Reynolds number. As an unusual feature, a negative lift slope dc_L/dα < 0 close to zero lift has been re‐observed under specific circumstances. We describe the findings and offer some explanations using two‐dimensional (2D) unsteady, transitional computational fluid dynamics. Possible implications for very thick aerodynamic profiles for use on wind turbine blades are discussed.

中文翻译：

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具有负升力斜率区域的厚空气动力学轮廓，可能会对风力涡轮机叶片的轮廓产生影响

在Deutsch–NiederländischeWindkanäle–German –Dutch风洞（DNW）的高压风洞（HochDruckkanal Goettingen [HDG]）中，以高（3至1200万）雷诺数研究了47％厚的翼型对称轮廓。作为一个不寻常的特点，一个负升力斜率d Ç_大号/ d α  <0接近零升程已根据具体情况再观察到。我们描述了发现，并使用二维（2D）非稳态，过渡计算流体动力学提供了一些解释。讨论了用于风力涡轮机叶片的非常厚的空气动力学轮廓的可能含义。