Applications of Low-Speed Dynamic-Stall Model to the NREL Airfoils
Applications of Low-Speed Dynamic-Stall Model to the NREL Airfoils
复制标题
低速动态失速模型在NREL翼型中的应用
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
F. Coton
中科院分区：
文献类型：
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作者：
W. Sheng;R. Galbraith;F. Coton
美国国家可再生能源实验室（NREL）翼型件已经专门针对风力涡轮机应用而开发，并且预计在不增加最大功率水平的情况下产生更多的年能量。这些翼型被设计成具有有限的最大升力和对前缘粗糙度相对较低的敏感性。结果，这些翼型具有与应用于直升机桨叶的翼型完全不同的前缘轮廓，并且因此具有完全不同的动态失速特性。不幸的是，对于风力涡轮机空气动力学，使用的动态失速模型仍然是专门为直升机应用开发和改进的模型。一个很好的例子是Leishman-Beddoes动态失速模型，它是风力涡轮机应用中最流行的模型之一。其结果是，这种动态失速模型的应用，低速的情况下，可能是有问题的。近年来，针对低马赫数情况提出或调整了一些特定的动态失速模型，但其普适性有待进一步验证。本文考虑了Sheng等人（“A Modified Dynamic Stall Model for Low Mach Numbers，“2008，ASME J. Sol.能源工程，130（3），pp. 031013）到NREL翼型。预测值与俄亥俄州州立大学NREL翼型试验数据进行了比较。本研究有两个目的：验证低速动态失速模型的适用性，并为NREL翼型提供相关参数。
National Renewable Energy Laboratory, USA (NREL) airfoils have been specially developed for wind turbine applications, and projected to yield more annual energy without increasing the maximum power level. These airfoils are designed to have a limited maximum lift and relatively low sensitivity to leading-edge roughness. As a result, these airfoils have quite different leading-edge profiles from airfoils applied to helicopter blades, and thus, quite different dynamic-stall characteristics. Unfortunately for wind turbine aerodynamics, the dynamic-stall models in use are still those specially developed and refined for helicopter applications. A good example is the Leishman―Beddoes dynamic-stall model, which is one of the most popular models in wind turbine applications. The consequence is that the application of such dynamic-stall model to low-speed cases can be problematic. Recently, some specific dynamic-stall models have been proposed or tuned for the cases of low Mach numbers, but their universality needs further validation. This paper considers the application of the modified dynamic low-speed stall model of Sheng et al. ( "A Modified Dynamic Stall Model for Low Mach Numbers, " 2008, ASME J. Sol. Energy Eng., 130(3), pp. 031013) to the NREL airfoils. The predictions are compared with the data of the NREL airfoils tested at the Ohio State University. The current research has two objectives: to justify the suitability of the low-speed dynamic-stall model, and to provide the relevant parameters for the NREL airfoils.