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首页> 外文会议>34th Wind energy symposium 2016 >Implicit Large-Eddy Simulation of 2D Counter-Rotating Vertical-Axis Wind Turbines
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Implicit Large-Eddy Simulation of 2D Counter-Rotating Vertical-Axis Wind Turbines

机译：二维反向旋转垂直轴风力发电机的隐式大涡模拟

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摘要

Recent theoretical and experimental work has suggested that placing a vertical-axis wind turbine near a similar turbine that is rotating in the opposite direction may improve the efficiency of both turbines. A high-order Implicit Large Eddy Simulations (ILES) method is used to confirm these results by modeling a 2D cross-section of the wind turbines. In order to account for the moving domain, an element flipping technique is employed. This approach flips elements and uses an L~2-projection on the interfaces between the rotating turbines and the static outer mesh region. An Arbitrary-Lagrangian-Eulerian method is used to solve for the dynamic pressure and shear stress on the turbine blades using an isentropic formulation of the compressible Navier-Stokes equation. Our preliminary results seem to confirm those of the recently published experiments for straight-bladed, counter-rotating turbines. When the turbines are oriented such that a line connecting their centers of rotation is perpendicular to the incident wind direction, the power coefficient of each turbine can increase by more than 10%. In fact, when the turbines are oriented in a doublet-like configuration, where the blades travel upwind in the interior region between the turbines, our simulations show that the power coefficient of each turbine is increased by 15%. However, unlike the experimental results, when the incident wind is oriented parallel to this line, the power coefficient of the shadowed turbine is reduced significantly. We show snapshots of the fluid velocity and hypothesize why the power of the turbines may be increased due to blockage effects. That is, at certain azimuthal angles the relative wind speed that the blade encounters is larger than in the isolated case.
机译：最近的理论和实验工作表明，将垂直轴风力涡轮机放置在以相反方向旋转的类似涡轮机附近可以提高两个涡轮机的效率。高阶隐式大涡模拟（ILES）方法用于通过对风力涡轮机的2D横截面建模来确认这些结果。为了考虑移动域，采用了元素翻转技术。这种方法翻转元素，并在旋转涡轮机和静态外部网格区域之间的界面上使用L〜2投影。使用可压缩的Navier-Stokes方程的等熵公式，采用任意Lagrangian-Eulerian方法求解涡轮机叶片上的动压力和切应力。我们的初步结果似乎证实了最近发表的直叶片，反向旋转涡轮机的实验结果。当涡轮机被定向为使得连接其旋转中心的线垂直于入射风向时，每个涡轮机的功率系数可以增加超过10％。实际上，当涡轮机以双峰状结构定向时，叶片在涡轮机之间的内部区域中向上风行进，我们的模拟表明，每台涡轮机的功率系数提高了15％。但是，与实验结果不同，当入射风平行于该线定向时，带阴影的涡轮机的功率系数会大大降低。我们显示了流体速度的快照，并假设了为什么由于阻塞效应而涡轮机的功率可能会增加。即，在某些方位角处，叶片遇到的相对风速比在隔离情况下要大。

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  • 来源
    《34th Wind energy symposium 2016》|2016年|558-569|共12页
  • 会议地点 San Diego CA(US)
  • 作者

    Samuel Kanner; Luming Wang; Per-Olof Persson;

  • 作者单位

    University of California, Berkeley, Berkeley, CA 94720-3840, U.S.A.;

    University of California, Berkeley, Berkeley, CA 94720-3840, U.S.A.;

    University of California, Berkeley, Berkeley, CA 94720-3840, U.S.A.;

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  • 正文语种 eng
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