Wind turbine rotor-tower interaction using an incompressible overset grid method
Wind turbine rotor-tower interaction using an incompressible overset grid method
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DOI：
10.1002/we.327
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发表时间：
2007-01
期刊：
影响因子：
4.1
通讯作者：
F. Zahle;N. Sørensen;J. Johansen
中科院分区：
文献类型：
--
作者：
F. Zahle;N. Sørensen;J. Johansen
本文对NREL六期水轮机的非定常流动进行了三维Navier-Stokes数值模拟。计算是使用结构化网格、不可压缩的有限体积流动求解器EllipSys3D进行的，该程序已扩展到包括使用溢流网格。首先对孤立转子进行了计算，然后对涡轮机的顺风向布局进行了计算，包括对转子、塔架和隧道底板边界的模拟。该解算器成功地捕捉到了旋翼与塔尾迹之间的非定常干扰，计算结果与实验数据吻合较好。旋翼和塔架之间的相互作用导致叶片上的瞬时载荷显著增加，其特征是叶片的瞬时卸荷和随后的重新加载与尾迹中的速度差相关，以及与脱落涡的相互作用，这导致了强烈的时变响应。结果表明，转子对塔体脱落频率有很大影响，在一定的流动条件下，塔体上部会发生旋涡锁定。版权所有©2009 John Wiley&Sons，Ltd.
In this paper, 3D Navier–Stokes simulations of the unsteady flow over the NREL Phase VI turbine are presented. The computations are carried out using the structured grid, incompressible, finite volume flow solver EllipSys3D, which has been extended to include the use of overset grids. Computations are presented, firstly, on an isolated rotor, and secondly, on the downwind configuration of the turbine, which includes modelling of the rotor, tower and tunnel floor boundary. The solver successfully captures the unsteady interaction between the rotor blades and the tower wake, and the computations are in good agreement with the experimental data available. The interaction between the rotor and the tower induces significant increases in the transient loads on the blades and is characterized by an instant deloading and subsequent reloading of the blade, associated with the velocity deficit in the wake, combined with the interaction with the shed vortices, which causes a strongly time-varying response. Finally, the results show that the rotor has a strong effect on the tower shedding frequency, causing under certain flow conditions vortex lock-in to take place on the upper part of the tower. Copyright © 2009 John Wiley & Sons, Ltd.