A numerical investigation into the influence of unsteady wind on the performance and aerodynamics of a vertical axis wind turbine

Danao, Louis Angelo M.; Edwards, Jonathan; Eboibi, Okeoghene; Howell, Robert J.

doi:10.1016/j.apenergy.2013.11.045

Cited by 124 publications

(63 citation statements)

References 21 publications

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“…This prediction accuracy is much higher than previous vertical axis turbine CFD predictions, which exhibit maximum Cp errors of more than 45% [12,14,[29][30][31], possibly due to the inclusion of the full turbine geometry in the present study. The use of 3D models also allows for the direct simulation of Cp without the need for empirical correction for 2D models as previous used [8,10,16].…”

Section: Validation Of Numerical Simulations With Experimental Fluid contrasting

confidence: 42%

Three-dimensional numerical simulations of straight-bladed vertical axis tidal turbines investigating power output, torque ripple and mounting forces

et al. 2015

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Three straight-bladed vertical axis turbine designs were simulated using ThreeDimensional (3D) transient Computational Fluid Dynamics (CFD) models, using a commercial Unsteady Reynolds Averaged Navier-Stokes (URANS). The turbine designs differed in support strut section, blade-strut joint design and strut location to evaluate their effect on power output, torque fluctuation levels and mounting forces. Simulations of power output were performed and validated against Experimental Fluid Dynamics (EFD), with results capturing the impacts of geometrical changes on turbine power output. Strut section and blade-strut joint design were determined to significantly influence total power output between the three turbine designs, with strut location having a smaller but still significant effect. Maximum torque fluctuations were found to occur around the rotation speed corresponding to maximum power output and fluctuation levels increased with overall turbine efficiency. Turbine mounting forces were also simulated and successfully validated against EFD results. Mounting forces aligned with the inflow increased with rotational rates, but plateaued due to reductions in shaft drag caused by rotation and blockage effects. Mounting forces perpendicular to the inflow were found to be 75% less than forces aligned with the inflow. High loading force fluctuations were found, with maximum values 40% greater than average forces.

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Section: Validation Of Numerical Simulations With Experimental Fluid contrasting

confidence: 42%

Three-dimensional numerical simulations of straight-bladed vertical axis tidal turbines investigating power output, torque ripple and mounting forces

et al. 2015

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“…The results of this study show that the torque and power coefficient could increase by up to 30% to 35%. In another study, the effect of an unsteady incoming wind on the performance of VAWTs has been investigated by Danao et al [14]. Almohammadi et al [15] validated the CFD simulation by using the Grid Convergence Index method, fitting method and mesh independent solution by means of the Richardson Extrapolation method.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Optimal Omni-Direction-Guide-Vane Design for Vertical Axis Wind Turbines Based on Unsteady Flow CFD Simulation

et al. 2016

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With soaring energy demands, the desire to explore alternate and renewable energy resources has become the focal point of various active research fronts. Therefore, the scientific community is revisiting the notion to tap wind resources in more rigorous and novel ways. In this study, a two-dimensional computational investigation of the vertical axis wind turbine (VAWT) with omni-direction-guide-vane (ODGV) is proposed to determine the effects of this guide vane. In addition, the mesh and time step (dt) size dependency test, as well as the effect of the different turbulence models on results accuracy are investigated. Eight different shape ratios (R) of the omni-direction-guide-vane were also examined in this study. Further, the CFD model is validated by comparing the numerical results with the experimental data. Validation results show a good agreement in terms of shape and trend in CFD simulation. Based on these results, all the shape ratios, except two ratios including 0.3 and 0.4 at TSR of 1.3 to 3, have a positive effect on the power and torque coefficient improvement. Moreover, results show that the best case has a shape ratio of 0.55, which improves the power coefficient by 48% and the torque coefficient up to 58%.

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“…Taher G et al [10] the effect of barrier placed in front of rotor on the Darrieus performance is analyzed numerically; this barrier has been designed to increase the performance of the Darrieus wind rotor. Danao et al [11] realized nu-, 475…”

Section: Introductionmentioning

confidence: 99%

Experimental performance analysis of biplane VAWT configurations

Oulhaci¹,

Imine²,

Ladjedel³

et al. 2017

Istrazivanja I Projektovanja Za Privredu

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A numerical investigation into the influence of unsteady wind on the performance and aerodynamics of a vertical axis wind turbine

Cited by 124 publications

References 21 publications

Three-dimensional numerical simulations of straight-bladed vertical axis tidal turbines investigating power output, torque ripple and mounting forces

Three-dimensional numerical simulations of straight-bladed vertical axis tidal turbines investigating power output, torque ripple and mounting forces

Investigation of the Optimal Omni-Direction-Guide-Vane Design for Vertical Axis Wind Turbines Based on Unsteady Flow CFD Simulation

Experimental performance analysis of biplane VAWT configurations

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