Experimental investigation of a pitch-oscillating wind turbine airfoil with vortex generators
Experimental investigation of a pitch-oscillating wind turbine airfoil with vortex generators
复制标题
带涡流发生器的俯仰振荡风力机翼型的实验研究
DOI：
10.1063/5.0013300
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发表时间：
2020-11
影响因子：
2.5
通讯作者：
Guo Guangxing
中科院分区：
文献类型：
--
作者：
Li Shuang;Zhang Lei;Xu Jin;Yang Ke;Song Juanjuan;Guo Guangxing
来流剪切和湍流、倾斜或偏航不对准以及塔通道导致涡轮机叶片上的动态失速。在风力机节能改造逐渐普及的背景下，测量了涡流发生器（Vortex Generator，VG）对典型风力涡轮机翼型DU 91-W2-250气动性能的影响。实验是在雷诺数为3 × 105的风洞中进行的。试验模型的振动由伺服电机驱动，气动性能的测量使用ESP-64扫描仪。流动分离是可视化的簇。结果表明，安装涡流发生器可以有效地控制翼型的静态失速和动态失速，这是因为涡流发生器在翼型前缘吸力面附近形成了一个低压区，且压力平台出现的时间比光滑翼型要晚。同时，涡流发生器可以有效地增大逆压梯度，使失速前的流动提前发生转变，延迟失速前的流动分离，迫使流场处于湍流状态。研究还发现，在动态失速过程中，涡流发生器可以减小由边界层湍流引起的压力波动。此外，涡流发生器也被发现在抑制涡的展向运动是有用的。然而，在静、动态条件均不允许的情况下，涡流发生器并不能改善深失速区的气动性能。
The inflow shear and turbulence, tilt or yaw misalignment, and tower passage lead to dynamic stall on turbine blades. The effects of vortex generators (VGs) on the aerodynamic performance of a typical wind turbine airfoil, namely, DU91-W2-250, are measured under the background that VGs are gradually and widely installed for energy improvement. The experiment is carried out in a wind tunnel at the Reynolds number of 3 × 10 5. The oscillation of the testing model is driven by a servo motor, and the aerodynamic performance is measured using an ESP-64 scanner. The flow separation is visualized with tufts. The obtained results show that the installation of the VGs could effectively control both static stall and dynamic stall of the airfoil because VGs cause a lower pressure region on the airfoil suction surface near the leading edge and a pressure plateau that appears later than in the smooth airfoil. Meanwhile, the VGs could effectively increase the adverse pressure gradient and lead to an early transition to delay the flow separation before stall and force the flow field in the turbulence state. It is also found that the VGs could reduce the pressure fluctuations caused by the turbulence of the boundary layer during dynamic stall. Furthermore, the VGs are also found to be useful in suppressing the span-wise movement of vortices. However, the VGs could not improve the aerodynamic performance in the deep stall region under none of the static and dynamic conditions.
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影响因子：
4.6
作者：
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影响因子：
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通讯作者：
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