Vortex Generators for Wind Turbine Blades: A Combined Wind Tunnel and Wind Turbine Parametric Study-猫眼课题宝

DOI：

10.1115/gt2012-69197

发表时间：

2012-06

期刊：

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其他

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作者：

Hanns Mueller-Vahl;G. Pechlivanoglou;C. Nayeri;C. Paschereit

涡流发生器 (VG) 是被动流动控制装置，通常用于防止风力涡轮机叶片上的流动分离。它们减轻了失速造成的破坏性疲劳载荷，同时增加了升力，从而导致转子扭矩增加。这项工作总结了一个旨在使用 VG 优化截面以及整个旋翼叶片空气动力学的研究项目。通过 2D 机翼截面的力平衡测量，研究了弦向位置、翼展方向间距和 VG 尺寸的影响。减小相邻 VG 之间的距离会导致静态失速角和最大升力大幅增加，但也会导致阻力显着增加以及超过静态失速角的角度时升力急剧偏移。涡流发生器的最佳弦向位置在 x/c = 15%–20% 范围内，可以获得相对较低的寄生阻力和平滑的失速后升力曲线。在不同弦向位置进行粒子图像测速测量，以深入了解相邻流向涡流之间的相互作用。最佳 VG 配置的实验空气动力学性能曲线用于预测其对风力涡轮机叶片空气动力学的影响。设计了三种不同的转子叶片，并通过 Smart Blade GmbH 开发的叶片元件动量 (BEM) 代码 (QBlade) 模拟了几种失速和变桨距调节风力涡轮机模型。对带有和不带有 VG 的旋翼叶片的性能进行了模拟，以评估它们对空气动力性能和负载的影响。最后，使用先前测量的高粗糙度条件下的稳态性能曲线来模拟表面粗糙度对上述转子叶片性能的不利影响。这样可以估计 VG 用作改造元件以恢复表面受污染叶片性能的潜力。© 2012 ASME

Vortex generators (VGs) are passive flow control devices commonly employed to prevent flow separation on wind turbine blades. They mitigate the damaging fatigue loads resulting from stall while increasing lift and consequently lead to rotor torque increase. This work summarizes a research project aimed at optimizing the sectional as well as the full rotor-blade aerodynamics using VGs.The effects of chordwise position, spanwise spacing and VG size were studied with force balance measurements of a 2D wing section. Reducing the distance between adjacent VGs produced large increases in the static stall angle and maximum lift, but also resulted in a significant increase in drag as well as sharp lift excursions at angles exceeding the static stall angle. The optimal chordwise position of the vortex generators was found to be in the range of x/c = 15%–20%, where a comparatively low parasitic drag and a smooth post-stall lift curve were achieved. Particle Image Velocimetry measurements were conducted at various chordwise positions to provide insight into the interaction between adjacent streamwise vortices.The experimental aerodynamic performance curves of the optimal VG configuration were used to project their effect on wind turbine blade aerodynamics. Three different rotorblades were designed and several stall and pitch regulated wind turbine models were simulated by means of a Blade Element Momentum (BEM) code (QBlade) developed by Smart Blade GmbH. The performance of the rotorblades with and without VGs was simulated in order to assess their effect on the aerodynamic performance and loads. Finally, previously measured steady state performance curves under high-roughness conditions were used to simulate the detrimental effect of surface roughness on the performance of the aforementioned rotorblades. This allows for an estimate of the potential of the VGs to be employed as retrofit elements for performance recovery of blades with a contaminated surface.© 2012 ASME

Vortex Generators for Wind Turbine Blades: A Combined Wind Tunnel and Wind Turbine Parametric Study

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