High-resolution numerical simulation of the performance of vertical axis wind turbines in urban area: Part I, wind turbines on the side of single building

Xu, Wenhao; Li, Gaohua; Zheng, Xing; Li, Ye; Li, Shoutu; Zhang, Chen; Wang, Fuxin

doi:10.1016/j.renene.2021.04.071

Cited by 47 publications

(9 citation statements)

References 54 publications

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“…8 shows the fluctuation in instantaneous torque coefficient with azimuthal angle on a single blade. The torque coefficient is larger in the upstream region, and lower in the downstream region (similar to results presented by [67][68][69], etc.). Negative torque is generated in the downstream region for 200 °≤ 𝜃𝜃 ≤ 330 °.…”

Section: Three-bladed Vertical-axis Turbine With Pitch Controlsupporting

confidence: 88%

Numerical analysis of the performance of a three-bladed vertical-axis turbine with active pitch control using a coupled unsteady Reynolds-averaged Navier-Stokes and actuator line model

Zhao¹,

Creech²,

Li³

et al. 2023

J Hydrodyn

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In this paper, we present a numerical model of a vertical-axis turbine (VAT) with active-pitch torque control.The model is based upon Wind and Tidal Turbine Embedded Simulator (WATTES) and WATTES-V turbine realisations in conjunction with the actuator line method (ALM), and uses OpenFOAM to solve the unsteady Reynolds-averaged Navier-Stokes (URANS) equations with two-equation 𝑘𝑘 − 𝜀𝜀 turbulence closure. Our novel pitch-controlled system is based on an even pressure drop across the entire rotor to mitigate against dynamic stall at low tip speed ratio. The numerical model is validated against experimental measurements and alternative numerical predictions of the hydrodynamic performance of a 1:6 scale UNH-RM2 hydrokinetic turbine.Simulations deploying the variable pitch mechanism exhibit improved turbine performance compared to measured data and fixed zero-pitch model predictions. Near-wake characteristics are investigated by examining the vorticity distribution near the turbine. The pitch-controlled system is demonstrated to theoretically decrease turbulence generated by turbine rotations, mitigate the intensity of vortex shedding and size of detached vortices, and significantly enhance the performance of a vertical-axis hydrokinetic turbine for rated tip-speed ratios.

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Section: Three-bladed Vertical-axis Turbine With Pitch Controlsupporting

confidence: 88%

Numerical analysis of the performance of a three-bladed vertical-axis turbine with active pitch control using a coupled unsteady Reynolds-averaged Navier-Stokes and actuator line model

Zhao¹,

Creech²,

Li³

et al. 2023

J Hydrodyn

Self Cite

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“…The wind turbine is known as the wind energy harvester when enough wind power is available to rotate the blade. The horizontal axis wind turbine (HAWT) type is the most wind turbine construction as they provide the highest performance among others 3,4) in terms of power. But they are more complex and less practical use.…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement of H-Darrieus Wind Turbine with High Efficiency Vortex Structure Attachment

Anggara¹,

Budiana²,

Harsito³

et al. 2023

Evergreen

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The H-Darrieus wind turbine could be applied as an alternative electricity generation source. However, their performance is still low, affecting less attention to being used as electricity generation sources. Considering the current condition, the present study provides a numerical simulation of a potential performance enhancement of the H-Darrieus wind turbine by adding a highefficiency vortex (HEV). HEV owns the ability to control the flow around the blade. HEV causes turbulent flow around the turbine while increasing turbulent kinetic energy. Three different HEV structures in rectangular, trapezoidal, and triangular shapes were attached to the blade to investigate the wind turbine performance. Two-tab angles (β) of 30° and 45° were applied to each structure to investigate the best position of HEV. The blade without HEV was considered as the baseline for the performance evaluation. It is revealed that triangular HEV performed the best with β of 30°, improving the power coefficient by 34% compared to the baseline when the tip speed ratio (TSR) is more than 1.5.

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“…The ability of VAWTs to capture turbulent wind flows makes them suitable for urban zones, 9,10 which grows the study rate of VAWTs in these areas. A wind tunnel study of dual counter-rotating VAWTs in urban environments was investigated by Li et al 46 The flow characteristics of VAWTs in buildings were examined widely by Xu et al 47,48 They studied the performance of VAWTs on the side of a building 47 ; then, the performance of VAWTs located in a space between two buildings while the average output power of the turbines increased by more than 30%. 48 Recently, some urban buildings and structures have become famous for using wind turbines inside their structures.…”

Section: Introductionmentioning

confidence: 99%

Optimized configuration with economic evaluation for shrouded vertical axis wind turbines applicable for urban structures

Rafiei,

Gharali,

Soltani

2023

Energy Science & Engineering

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In recent urban buildings, there is an interest in using wind turbines inside the buildings. Thus, the rotors of wind turbines are shrouded by the walls of the buildings. A design for using wind turbines in urban areas is to use shrouded turbines on the roof of a building. Since vertical axis wind turbines (VAWTs) with low environmental impacts are recommended for energy supply in urban areas, here, the interaction of two shrouded VAWTs has been studied numerically. Based on the effects of different shroud parts, the diffuser‐shrouded turbines are selected. The arrangement of diffuser‐shrouded VAWTs has been optimized using the response surface method optimization with the Kriging model. The optimization samples are chosen by the design of experiment method to reduce the number of simulations and increase optimization accuracy. The total power coefficient of the optimized cluster is 46.2% higher than the sum of the same individual diffuser‐shrouded turbines and 149.6% higher than the sum of individual bare VAWTs. The economic assessment shows that the levelized cost of energy of the optimized cluster of two diffuser‐shrouded VAWTs is reduced by about 40% compared to two bare VAWTs.

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High-resolution numerical simulation of the performance of vertical axis wind turbines in urban area: Part I, wind turbines on the side of single building

Cited by 47 publications

References 54 publications

Numerical analysis of the performance of a three-bladed vertical-axis turbine with active pitch control using a coupled unsteady Reynolds-averaged Navier-Stokes and actuator line model

Numerical analysis of the performance of a three-bladed vertical-axis turbine with active pitch control using a coupled unsteady Reynolds-averaged Navier-Stokes and actuator line model

Performance Improvement of H-Darrieus Wind Turbine with High Efficiency Vortex Structure Attachment

Optimized configuration with economic evaluation for shrouded vertical axis wind turbines applicable for urban structures

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