Aerodynamic effects of compressibility for wind turbines at high tip speeds
Aerodynamic effects of compressibility for wind turbines at high tip speeds
复制标题
高叶尖速度下风力涡轮机压缩性的空气动力效应
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Thorsten Lutz
中科院分区：
文献类型：
--
作者：
N. N. Sørensen;F. Bertagnolio;Eva Jost;Thorsten Lutz
在目前的工作中，二维翼型计算被用来研究20兆瓦以上的大型风力涡轮机的尖端区域的可压缩性的影响。在过去，不可压缩CFD求解器的应用已经广泛地应用于风力涡轮机空气动力学，这是由于其在转子中心附近经历的近不可压缩条件下的效率和鲁棒性。随着现代风力涡轮机尺寸的增加以及接近高叶尖速度的期望，在涡轮机的叶尖区域中可能违反不可压缩假设。为了研究可压缩性的影响以及使用显式可压缩性修正来修正不可压缩流解的可能性，对大型风力涡轮机条件下的二维翼型空气动力学进行了CFD研究。目前的研究表明，经典的压缩性修正可以成功地应用于不可压缩的解决方案的后处理步骤，减少在预测的升力和阻力的误差在几个百分点内的附着流条件下，粘性效应是有限的马赫数高达0.3。
In the present work two dimensional airfoil computations are used to investigate the effects of compressibility in the tip region of large scale wind turbines of 20 MW+ size. In the past application of incompressible CFD solvers have been wide spread for wind turbine aerodynamics, due to their efficiency and robustness at the near incompressible conditions experienced near the rotor center. With the increasing size of modern wind turbines and the desire to approach high tip speeds, the incompressible assumption might be violated in the tip region of the turbine. To investigate the effects of compressibility and the possibility of correcting incompressible flow solutions using explicit compressibility corrections, a CFD study of 2D airfoil aerodynamics at conditions of a large scale wind turbine is performed. The present study show that classical compressibility corrections can be successfully applied as a post-processing step to incompressible solutions, reducing the error in the predicted lift and drag to within a few percent for attached flow conditions where viscous effects are limited at Mach numbers upto 0.3.