Power augmentation of Darrieus wind turbine blades using trapped vortex cavity

Improving performance of H-Type NACA 0021 Darrieus rotor using leading-edge stationary/rotating microcylinders: Numerical studies

“…13 (a)-(d). Arriving azimuth angle of 360 degrees, the flow is seen to be symmetrical and fully attached to the blade walls as previously seen in [12].…”

“…Many studies have been performed in the last years focusing on quantifying the effects of trapped vortex cavity on vertical axis wind turbine (VAWT) performance. Ibrahim et al [12] performed two-dimensional (2D) numerical calculations to investigate the effect of cavity on the straight bladed Darrieus rotor using URANS simulations. The calculation was conducted for a cavity located on the blade suction side, at 20 % blade chord length from leading edge.…”

Small wind turbines and their potential for internet of things applications

“…Finally, Ibrahim et al. 115 discuss active control techniques incorporating dimples and blowers, reporting significant improvements in self-start capability. Gurney flaps 116 are small flat plates mounted vertically on the airfoil’s trailing edge, as depicted in Figure 7 Aiii, to passively regulate flow control.…”

Computational Fluid Dynamics Evaluations on New Designs of the Delta-Shaped Blade Darrieus Hydrokinetic Turbine

“…A lot of research activity was also conducted on the turbine blade modifications and passive flow control techniques, including the slotted airfoil [38,39], a slotted deflective flap at the trailing edge [40,41], the airfoil with different trapped vortex cavities layouts [42,43], dimple designs and configurations [44,45], leading-edge airfoil-slat [46], and the Gurney flaps [47,48] in order to delay flow separation across the turbine blades and enhance their performance. The results showed that blade modifications could delay stall and enhance turbine power coefficient by around 18-28%.…”