Research on Effect of Vortex Generator on Dynamic Stall of Wind Turbine Blade at Different Oscillation Parameters

doi:10.3901/JME.2023.02.251

Abstract

Abstract: Dynamic stall has a great influence on the aerodynamic characteristics of wind turbine blades. Vortex generators (VGs) are the most widely used flow control technology in the field of wind turbine, which has a certain inhibitory effect on dynamic separation. In order to explore the inhibitory effect of wind turbine blades with VGs on dynamic stall, SST k-ω turbulence model is used to analyze the performance of the airfoil segment with VGs on the oscillating motion at different amplitude Δα and reduced frequency k. The results show that with the increase of amplitude, the hysteresis effect of dynamic stall increases, the stall angle is delayed, the maximum lift coefficient increases, the lift coefficient decreases in the pitching-up stage and the average lift coefficient decreases. With the increase of the reduced frequency, the hysteresis effect of the resistance coefficient increases, and the drag coefficient increases in the pitching-up stage and decreases in the pitching-down stage. The average lift and drag coefficients first increase and then decrease with the increase of the reduced frequency. Under the condition of high reduced frequency, the dynamic response of flow field is obvious, and the stall of airfoil segment with VGs is serious. Compared with the smooth airfoil segment, the delayed dynamic stall effect is directly proportional to the amplitude and negatively related to the reduced frequency.

Key words: vortex generator, DU91-W2-250, dynamic stall, oscillation parameters, amplitude, reduced frequency

CLC Number:

TG156

FENG Junxin, ZHAO Zhenzhou, JIANG Ruifang, MENG Lingyu, CHEN Ming, XU Bofeng. Research on Effect of Vortex Generator on Dynamic Stall of Wind Turbine Blade at Different Oscillation Parameters[J]. Journal of Mechanical Engineering, 2023, 59(2): 251-258.

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