Controlling dynamic stall using vortex generators on a wind turbine airfoil

Tavernier, Delphine De; Ferreira, Carlos; Viré, Axelle; LeBlanc, Bruce; Bernardy, S.

doi:10.1016/j.renene.2021.03.019

Cited by 68 publications

(37 citation statements)

References 42 publications

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“…The idea is not new and has been employed not only on aircraft wings, fuselage, and rotor blades, but also on other transport vehicles. [53][54][55][56][57][58][59][60][61][62][63][64] There are even patented solutions. 59 It is interesting that vortex generators are utilized in both sub-and supersonic flows.…”

Section: Passive Flow Controlmentioning

confidence: 99%

“…59 This form (although any other shape and arrangement is also possible) is most often employed on the root sections of large-scale wind turbine blades to mitigate the effects of flow separation. Given the importance of the topic, a truly great number of both experimental [60][61][62][63] and numerical [64][65][66][67][68][69][70][71] research studies is available. Different VGs are experimentally explored by Zhang et al 60 The results show that the maximum lift coefficient increases with VGs installed toward the leading edge of airfoils.…”

Section: Passive Flow Controlmentioning

confidence: 99%

“…Experimental study in Skrzypin´ski et al 62 emphasizes that, although VGs can increase annual energy production, blade surface roughness and wind turbine characteristics should also be considered, and all three influential factors should be adequately matched. The possibility of suppressing dynamic stall on wind turbine blades is experimentally investigated by De Tavernier et al 63 On the other hand, the effects of VGs on blade aerodynamic performance are computationally studied (by RANS) by Zhao et al 64 (Figure 2(b)). Numerical investigation of VGs by scale-resolving methods performed by Mereu et al 65 The authors conclude that scale-resolving approach provides better results than RANS modeling and that it is possible to capture the stalling angle with 64 (c) wavy leading edge, 77 and (d) sawtooth trailing edge.…”

Section: Passive Flow Controlmentioning

confidence: 99%

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Current state and future trends in boundary layer control on lifting surfaces

Svorcan

Wang

Griffin

2022

Advances in Mechanical Engineering

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Successful flow control may bring numerous benefits, such as flow stabilization, flow reattachment, separation delay, drag reduction, lift increase, aerodynamic performance improvement, energy efficiency increase, shock delay or weakening, noise reduction, etc. For these purposes, many different flow control devices, which can be classified as passive, semi-active and active, have been designed and tested. This review paper aims to highlight the most promising and commonly employed boundary layer control methods as well as outline their potential in specific applications in aerospace and energy engineering. Referenced studies, performed on various geometries (flat plates, channels, airfoils, wings, blades, cylinders), are primarily numerical or experimental. Although enhanced aerodynamic performance is achieved in many cases, further research is required to draw general conclusions. This paper aims to demonstrate that, in the future, we may expect further developments of flow control actuators, as well as their increased application.

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Section: Passive Flow Controlmentioning

confidence: 99%

Section: Passive Flow Controlmentioning

confidence: 99%

Section: Passive Flow Controlmentioning

confidence: 99%

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Current state and future trends in boundary layer control on lifting surfaces

Svorcan

Wang

Griffin

2022

Advances in Mechanical Engineering

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“…When these vortices shed, they convect downstream and interact with the blade for an extended period of time throughout the downwind half of the blade's rotation (π ≤ θ < 2π) [17,21,22]. Bladevortex interaction and post-stall vortex shedding cause highly transient and heavy load fluctuations that jeopardise the turbine's structural integrity and often lead to premature fatigue failure [23,24,25]. Optimal operating tip-speed ratios for power production were found to be as low as λ = 1 by Miller et al [26], who studied a wind turbine operating at full dynamic similarity.…”

Section: Introductionmentioning

confidence: 99%

The dynamic stall dilemma for vertical-axis wind turbines

Fouest,

Mulleners

2022

Preprint

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Vertical-axis wind turbines (VAWT) are excellent candidates to complement traditional wind turbines and increase the total wind energy capacity. Development of VAWT has been hampered by their low efficiency and structural unreliability, which are related to the occurrence of dynamic stall. Dynamic stall consists of the formation, growth, and shedding of large-scale dynamic stall vortices, followed by massive flow separation. The vortex shedding is detrimental to the turbine's efficiency and causes significant load fluctuations that jeopardise the turbine's structural integrity. We present a comprehensive experimental characterisation of dynamic stall on a VAWT blade including time-resolved load and velocity field measurements. Particular attention is dedicated to the dilemma faced by VAWT to either operate at lower tip-speed ratios to maximise aerodynamic performance but experience dynamic stall, or to avoid dynamic stall at the cost of loosing performance. Based on the results, we map turbine operating conditions to one of three regimes: deep stall, light stall, and no stall. The light stall regime offers VAWT the best compromise in the dynamic stall dilemma as it yields positive tangential forces during the upwind and downwind rotation and reduces load transients by 75 % compared to the deep stall regime.

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“…re-energising the boundary layer (see Taylor et al (1947); Godard and Stanislas (2006); Cathalifaud et al (2009);De Tavernier et al (2021); Gao et al (2014); Lin (2002); Skrzypiński et al (2014); Perivolaris and Voutsinas (2001)). The vortices, aligned with the inflow leaving the device, increase the mixing between high speed flow (free stream) and low speed flow (boundary layer) thus delaying the flow separation (see Schubauer and Spangenberg (1960)).…”

mentioning

confidence: 99%

High Reynolds number wind turbine blade equipped with root spoilers. Part I: Unsteady aerodynamic analysis using URANS simulations

Potentier

Guilmineau

Finez³

et al. 2021

Preprint

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Abstract. A wind turbine blade equipped with root spoilers is analysed using 2D Computational Fluid Dynamics (CFD) to assess the unsteady impact of passive devices. Several metrics such as lift and drag coefficients, pressure and instantaneous velocity field around the aerofoil, Power Spectral Density and Strouhal number are used in the 2D unsteady analysis. The spoiler is found to efficiently rearrange the flow, adding lift throughout the positive angles of attack. However, the drawback is a high drag penalty coupled with high unsteadiness of the aerodynamic forces.

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Controlling dynamic stall using vortex generators on a wind turbine airfoil

Cited by 68 publications

References 42 publications

Current state and future trends in boundary layer control on lifting surfaces

Current state and future trends in boundary layer control on lifting surfaces

The dynamic stall dilemma for vertical-axis wind turbines

High Reynolds number wind turbine blade equipped with root spoilers. Part I: Unsteady aerodynamic analysis using URANS simulations

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