Modeling Vertical-Axis Wind-Turbine Performance: Blade-Element Method Versus Finite Volume Approach

Kozak, Peter; Vallverdú, David; Rempfer, Dietmar

doi:10.2514/1.b35550

Cited by 12 publications

(8 citation statements)

References 10 publications

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“…Wake interaction is the effect of the turbulent wakes generated by the front half blades on the rear half blades. By studying graphic visualizations of the vorticity generated by the blades, Kozal et al 21 proposed a formula to calculate the number of wakes, N ω = 0.85N b T SR. Each blade almost intersect with wake twice. By neglecting the wake diffusion, the wake length can be calculated, L wake = 2cN ω .…”

Section: Wake Interactionmentioning

confidence: 99%

“…In the Figure 6, the average power coefficient calculated by DMST with and without dynamic stall and wake correction is plotted with CFD result conducted by Kozak 21 . Kozak investigated the performance of the VAWT by using finite volume method simulation.…”

Section: Design Optimization Validationmentioning

confidence: 99%

“…Constraints on design variables, 0 ≤ A u0 − A u4 ≤ 0.35, −0.35 ≤ A l0 − A l4 ≤ 0 is used to assure success of design optimization. The symmetric baseline airfoil NACA0021 is a pre-optimal result conducted by a number of studies 6,21,22 . Therefore, the simple gradient-based method is employed to find optimal results quickly.…”

Section: Design Optimizationmentioning

confidence: 99%

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Double multiple stream tube theory coupled with dynamic stall and wake correction for aerodynamic investigation of vertical axis wind turbine

Pham²

2020

Sci. Tech. Dev. J.

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This study describes an effectively analytic methodology to investigate the aerodynamic performance of H vertical axis wind turbine (H-VAWT). An in-house code based on double multiple stream tube theory (DMST) coupled with dynamic stall and wake correction is implemented to estimate the power coefficient. Design optimization of airfoil shape is conducted to study the influences of the dynamic stall and turbulent wakes. Airfoil shape is universally investigated by using the Class/Shape function transformation method. The airfoil study shows that the upper curve tends to be less convex than the lower curve in order to extract more energy of the wind upstream and generate less drag of the blade downstream. The optimal results show that the power coefficient increases by 6.5% with the new airfoil shape.

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Section: Wake Interactionmentioning

confidence: 99%

Section: Design Optimization Validationmentioning

confidence: 99%

Section: Design Optimizationmentioning

confidence: 99%

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Double multiple stream tube theory coupled with dynamic stall and wake correction for aerodynamic investigation of vertical axis wind turbine

Pham²

2020

Sci. Tech. Dev. J.

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“…This leads to the highly unsteady and nonlinear flow phenomenon known as dynamic stall (Simão Ferreira et al, 2009;Buchner et al, 2015Buchner et al, , 2018, which causes significant hysteresis in drag and lift forces. Lastly, depending on the tip speed ratio and rotor solidity, a blade located on the downwind rotor section may interact with its own or another blade's wake generated upwind (Kozak et al, 2016;Posa and Balaras, 2018), complicating further the VAWT response.…”

Section: Introductionmentioning

confidence: 99%

A double-multiple streamtube model for vertical axis wind turbines of arbitrary rotor loading

et al. 2019

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Abstract. We introduce an improved formulation of the double-multiple streamtube (DMST) model for the prediction of the flow quantities of vertical axis wind turbines (VAWT). The improvement of the new formulation lies in that it renders the DMST valid for any induction factor, i.e., for any combination of rotor solidity and tip speed ratio. This is done by replacing the Rankine–Froude momentum theory of the DMST, which is invalid for moderate and high induction factors, with a new momentum theory recently proposed, which provides sensible results for any induction factor. The predictions of the two DMST formulations are compared with VAWT power measurements obtained at Princeton's High Reynolds number Test Facility, over a range of tip speed ratios, rotor solidities, and Reynolds numbers, including those experienced by full-scale turbines. The results show that the new DMST formulation demonstrates a better overall performance, compared to the conventional one, when the rotor loading is moderate or high.

show abstract

“…This leads to the highly unsteady and non-linear flow phenomenon known as dynamic stall (Simão Ferreira et al, 2009;Buchner et al, 2015Buchner et al, , 2018, which causes significant hysteresis in drag and lift forces. Lastly, depending on the tip speed ratio and rotor solidity, a blade located on the downwind rotor section may interact with its own or another blade's wake generated upwind (Kozak et al, 2016;Posa and Balaras, 2018), complicating further the VAWT response.…”

Section: Introductionmentioning

confidence: 99%

A Double Multiple Streamtube model for Vertical Axis Wind Turbines of arbitrary rotor loading

Ayati¹,

Steiros²,

Miller³

et al. 2019

Preprint

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Abstract. We introduce an improved formulation of the Double Multiple Streamtube (DMST) model for the prediction of the flow quantities of Vertical Axis Wind Turbines (VAWT). The improvement of the new formulation lies in that it renders the DMST valid for any induction factor, i.e. for any combination of rotor solidity and tip speed ratio. This is done by replacing the Rankine-Froude momentum theory of the DMST, which is invalid for moderate and high induction factors, with a new momentum theory recently proposed, which provides sensible results for any induction factor. The predictions of the two DMST formulations are compared with VAWT power measurements obtained at Princeton's High Reynolds number Test Facility, over a range of tip speed ratios, rotor solidities and Reyonlds numbers, including those experienced by full scale turbines. The results show that the new DMST formulation demonstrates a better overall performance, compared to the conventional one, when the rotor loading is moderate or high.

show abstract

Modeling Vertical-Axis Wind-Turbine Performance: Blade-Element Method Versus Finite Volume Approach

Cited by 12 publications

References 10 publications

Double multiple stream tube theory coupled with dynamic stall and wake correction for aerodynamic investigation of vertical axis wind turbine

Double multiple stream tube theory coupled with dynamic stall and wake correction for aerodynamic investigation of vertical axis wind turbine

A double-multiple streamtube model for vertical axis wind turbines of arbitrary rotor loading

A Double Multiple Streamtube model for Vertical Axis Wind Turbines of arbitrary rotor loading

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