Computational Fluid Dynamics of Flatback Airfoils for Wind Turbine Applications
Computational Fluid Dynamics of Flatback Airfoils for Wind Turbine Applications
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DOI：
10.2514/6.2006-194
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发表时间：
2006-01
期刊：
影响因子：
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通讯作者：
C. Stone;Stephanie M. Tebo;E. Duque
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文献类型：
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作者：
C. Stone;Stephanie M. Tebo;E. Duque
本文介绍了对风力机不同反翼型气动性能的计算研究结果。气动建模采用了多种湍流建模方法：非定常reynolds - averaging Navier-Stokes （URANS）方程、分离涡模拟（DES）和基于k{！RANS模型和k{方程子网格LES模型。所有的模拟都使用了覆盖的结构网格。湍流建模和网格分辨率研究表明，DES和HRLES方法都能捕获预期的定性湍流行为，如在湍流的分离尾迹区域中穿过湍流。定量结果包括使用URANS在一定迎角范围内预测的升力和阻力。结果表明，与传统的薄尾缘翼型相比，背翼型的设计结果大大增加了升力。对DES和HRLES两种先进建模方法的流场结果进行了定性比较和分析。观察到，DES方法不预测过渡和分离沿翼型，而HRLES方法做。说明了这一局限性，并给出了其对气动力的影响。
This paper presents results from a computational study of the aerodynamic performance of various atbac k airfoils designed for wind turbines. Multiple turbulence modelings methods are used for the aerodynamic modeling: Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations, Detached-Eddy Simulations (DES) and a Hybrid RANS/Large-Eddy Simulations (HRLES) method based on the k{! RANS model and k{equation sub-grid LES model. All simulations make use of overset structured grids. Turbulence modeling and grid resolution studies show that both DES and HRLES methods capture the expected qualitative turbulent behavior such as cross o w in the separated wake regions of the o w. Quantitative results include the predicted lift and drag over a range of angles-of-attack using URANS. It is shown that the atbac k airfoil design results in a substantially increased lift compared to traditional thin trailing edge airfoils. Flow-eld results from the two advanced modeling methods, DES and HRLES, are qualitatively compared and analyzed. It is observed that the DES method does not predict the transition and separation along the airfoil while the HRLES method does. This limitation is explained and the eects on the aerodynamic forces is also given.