Numerical Investigation of Effects of Turbulence Intensity on Aerodynamic Performance for Straight-Bladed Vertical-Axis Wind Turbines

Kuang, Limin; Lei, Hang; Zhou, Dai; Han, Zhaolong; Bao, Yan; Zhao, Yongsheng

doi:10.1061/(asce)ey.1943-7897.0000740

Cited by 10 publications

(3 citation statements)

References 51 publications

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“…For turbulence modeling, the k À v SST model is used. The k À v SST turbulence model is chosen because of the capability of this model for capturing the flow structures in oscillating domains (Ahmadi et al, 2009;Ol et al, 2010;Castelli et al, 2011;Rival et al, 2011;Kuang et al, 2021). Besides residuals that show the convergence criteria in CFD problems, the velocity and pressure values are other parameters that are confirmed the convergence of the steady simulation (Balduzzi et al, 2016;Tahani et al, 2016).…”

Section: Methodsmentioning

confidence: 99%

Power performance enhancement of vertical axis wind turbines by a novel gurney flap design

Mousavi

Masdari

Tahani

2021

AEAT

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Purpose Nowadays flaps and winglets are one of the main mechanisms to increase airfoil efficiency. This study aims to investigate the power performance of vertical axis wind turbines (VAWT) that are equipped with diverse gurney flaps. This study could play a crucial role in the design of the VAWT in the future. Design/methodology/approach In this paper, the two-dimensional computational fluid dynamics simulation is used. The second-order finite volume method is used for the discretization of the governing equations. Findings The results show that the gurney flap enhances the power coefficient at the low range of tip speed ratio (TSR). When an angled and standard gurney flap case has the same aerodynamic performance, an angled gurney flap case has a lower hinge moment on the junction of airfoil and gurney flap which shows the structural excellence of this case. In all gurney flap cases, the power coefficient increases by an average of 20% at the TSR range of 0.6 to 1.8. The gurney flap cases do not perform well at the high TSR range and the results show a lower amount of power coefficient compare to the clean airfoil. Originality/value The angled gurney flap which has the structural advantage and is deployed to the pressure side of the airfoil improves the efficiency of VAWT at the low and medium range of TSR. This study recommends using a controllable gurney flap which could be deployed at a certain amount of TSR.

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Section: Methodsmentioning

confidence: 99%

Power performance enhancement of vertical axis wind turbines by a novel gurney flap design

Mousavi

Masdari

Tahani

2021

AEAT

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“…However, further downstream (x = 4D, Figure 17), the effect of turbulent flow on dual VAWTs is more apparent in the velocity distribution. The lower velocity deficit under turbulent flow compared to smooth flow can be explained by the dissipation of the wake caused by the higher mixing with the surrounding wind stream which can lead to faster wake recovery [23]. Figure 18 and Figure 19 show the turbulence intensity measured in the wake at 1D downstream of the paired VAWTs taken at the optimal tip-speed ratio for smooth (I u = 0.35%) and turbulent flow (I u = 5.63%) respectively.…”

Section: Wake Of Paired Vawtsmentioning

confidence: 99%

“…As far as we know, previous works have only focused on the effect of turbulence on an isolated VAWT, but no previous research has investigated the effect of turbulence on a pair of H-type Darrieus VAWTs experimentally. However, the improvement of the total power output of dual VAWTs in a tandem arrangement under high degree of turbulence was proved numerically [23].…”

Section: Introductionmentioning

confidence: 99%

Effect of turbulence on the performance of a pair of vertical-axis wind turbines

Talamalek

Runacres

Troyer

2022

J. Phys.: Conf. Ser.

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The focus of this study is to investigate under high turbulence intensity the performance and wake characteristics of a pair of closely spaced counter-rotating vertical axis wind turbines (VAWTs) in wind tunnel-controlled conditions. To achieve this, wind tunnel experiments for an isolated VAWT and dual VAWTs are conducted. A squared-mesh wooden grid is placed upstream of the wind turbines to increase the level of free stream turbulence. The wind tunnel tests confirm the increase in power coefficient of paired VAWTs in turbulent flows compared to smooth flows. Additionally, this study analyses the near-wake downstream of the paired turbines in both smooth and turbulent flows to better understand the flow physics.

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Strategy for mitigating wake interference between offshore vertical-axis wind turbines: Evaluation of vertically staggered arrangement

Kuang,

Katsuchi,

Zhou

et al. 2023

Applied Energy

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Numerical Investigation of Effects of Turbulence Intensity on Aerodynamic Performance for Straight-Bladed Vertical-Axis Wind Turbines

Cited by 10 publications

References 51 publications

Power performance enhancement of vertical axis wind turbines by a novel gurney flap design

Power performance enhancement of vertical axis wind turbines by a novel gurney flap design

Effect of turbulence on the performance of a pair of vertical-axis wind turbines

Strategy for mitigating wake interference between offshore vertical-axis wind turbines: Evaluation of vertically staggered arrangement

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