This paper explores passive flow control via leading-edge (LE) slats to reduce the dynamic stall (DS) phenomenon and related blade-wake interaction in an H-Darrieus type vertical axis wind turbine (VAWT) operating under low wind speed conditions. A comprehensive 2D unsteady computational fluid dynamics (CFD) assessment has been carried out for the non-slatted baseline rotor and the advance slatted rotor (ASR) configurations. The unsteady Reynolds-averaged Navier-Stokes (URANS) approach with k-ω shear stress transport (SST) turbulence model and sliding mesh technique have been applied in Ansys Fluent. Optimum slat deflection angle δ has been evaluated using the single-blade oscillatory case with and without the LE slats. Results indicate a reduction in optimum δ from 16° at rated wind speed of 10 ms⁻¹ to 12° for low wind speed operation at 5 ms⁻¹. A significant increase in the maximum coefficient of lift C_L,max by approximately 32% and a delay in stall angle of attack α_max by 3° is obtained with ASR configuration compared to the baseline. Further assessment of the ASR configuration on the three-blade rotatory case demonstrates an increase in the power coefficient C_P by approximately 15% at the rated tip-speed ratio λ compared to the baseline.

本文探讨了通过前缘（LE）板条进行的无源流量控制，以减少在低风速条件下运行的H-Darrieus型垂直轴风力涡轮机（VAWT）中的动态失速（DS）现象和相关的叶片唤醒相互作用。对于非板条基线转子和高级板条转子（ASR）配置，已经进行了全面的二维非稳态计算流体动力学（CFD）评估。在Ansys Fluent中采用了具有k-ω剪切应力传递（SST）湍流模型和滑动网格技术的非稳态雷诺平均Navier-Stokes（URANS）方法。最佳的板条偏转角δ已在有和没有LE板条的单叶片振动情况下进行了评估。结果表明，额定风速为10 ms ^-1时，最佳δ从16°减小在低风速下以5 ms ^-1运行时，最大为12° 。在提升量C的最大系数A显著增加_{L，最大值}由约32％和在迎角α的失速角的延迟_最大3°是相对于基线具有ASR配置获得。对三叶片旋转情况下的ASR构型的进一步评估表明，在额定叶尖速比λ下，功率系数C _P与基线相比增加了约15％。