Numerical Investigation of the Tip Vortex of a Straight-Bladed Vertical Axis Wind Turbine with Double-Blades
Wind velocity distribution and the vortex around the wind turbine present a significant challenge in the development of straight-bladed vertical axis wind turbines (VAWTs). This paper is intended to investigate influence of tip vortex on wind turbine wake by Computational Fluid Dynamics (CFD) simula...
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| Format: | Article |
| Language: | English |
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MDPI AG
2017-10-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/10/11/1721 |
| _version_ | 1798006018191392768 |
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| author | Yanzhao Yang Zhiping Guo Yanfeng Zhang Ho Jinyama Qingan Li |
| author_facet | Yanzhao Yang Zhiping Guo Yanfeng Zhang Ho Jinyama Qingan Li |
| author_sort | Yanzhao Yang |
| collection | DOAJ |
| description | Wind velocity distribution and the vortex around the wind turbine present a significant challenge in the development of straight-bladed vertical axis wind turbines (VAWTs). This paper is intended to investigate influence of tip vortex on wind turbine wake by Computational Fluid Dynamics (CFD) simulations. In this study, the number of blades is two and the airfoil is a NACA0021 with chord length of c = 0.265 m. To capture the tip vortex characteristics, the velocity fields are investigated by the Q-criterion iso-surface (Q = 100) with shear-stress transport (SST) k-ω turbulence model at different tip speed ratios (TSRs). Then, mean velocity, velocity deficit and torque coefficient acting on the blade in the different spanwise positions are compared. The wind velocities obtained by CFD simulations are also compared with the experimental data from wind tunnel experiments. As a result, we can state that the wind velocity curves calculated by CFD simulations are consistent with Laser Doppler Velocity (LDV) measurements. The distribution of the vortex structure along the spanwise direction is more complex at a lower TSR and the tip vortex has a longer dissipation distance at a high TSR. In addition, the mean wind velocity shows a large value near the blade tip and a small value near the blade due to the vortex effect. |
| first_indexed | 2024-04-11T12:48:16Z |
| format | Article |
| id | doaj.art-2763e9a2c94843b8881c1e4e39ed7aea |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T12:48:16Z |
| publishDate | 2017-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-2763e9a2c94843b8881c1e4e39ed7aea2022-12-22T04:23:16ZengMDPI AGEnergies1996-10732017-10-011011172110.3390/en10111721en10111721Numerical Investigation of the Tip Vortex of a Straight-Bladed Vertical Axis Wind Turbine with Double-BladesYanzhao Yang0Zhiping Guo1Yanfeng Zhang2Ho Jinyama3Qingan Li4College of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaCollege of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaCollege of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaGraduate School of Bioresources, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, JapanDivision of Mechanical Engineering, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, JapanWind velocity distribution and the vortex around the wind turbine present a significant challenge in the development of straight-bladed vertical axis wind turbines (VAWTs). This paper is intended to investigate influence of tip vortex on wind turbine wake by Computational Fluid Dynamics (CFD) simulations. In this study, the number of blades is two and the airfoil is a NACA0021 with chord length of c = 0.265 m. To capture the tip vortex characteristics, the velocity fields are investigated by the Q-criterion iso-surface (Q = 100) with shear-stress transport (SST) k-ω turbulence model at different tip speed ratios (TSRs). Then, mean velocity, velocity deficit and torque coefficient acting on the blade in the different spanwise positions are compared. The wind velocities obtained by CFD simulations are also compared with the experimental data from wind tunnel experiments. As a result, we can state that the wind velocity curves calculated by CFD simulations are consistent with Laser Doppler Velocity (LDV) measurements. The distribution of the vortex structure along the spanwise direction is more complex at a lower TSR and the tip vortex has a longer dissipation distance at a high TSR. In addition, the mean wind velocity shows a large value near the blade tip and a small value near the blade due to the vortex effect.https://www.mdpi.com/1996-1073/10/11/1721wind energyvertical axis wind turbine (VAWT)flow fieldtip vortexwind velocity deficittorque coefficient |
| spellingShingle | Yanzhao Yang Zhiping Guo Yanfeng Zhang Ho Jinyama Qingan Li Numerical Investigation of the Tip Vortex of a Straight-Bladed Vertical Axis Wind Turbine with Double-Blades Energies wind energy vertical axis wind turbine (VAWT) flow field tip vortex wind velocity deficit torque coefficient |
| title | Numerical Investigation of the Tip Vortex of a Straight-Bladed Vertical Axis Wind Turbine with Double-Blades |
| title_full | Numerical Investigation of the Tip Vortex of a Straight-Bladed Vertical Axis Wind Turbine with Double-Blades |
| title_fullStr | Numerical Investigation of the Tip Vortex of a Straight-Bladed Vertical Axis Wind Turbine with Double-Blades |
| title_full_unstemmed | Numerical Investigation of the Tip Vortex of a Straight-Bladed Vertical Axis Wind Turbine with Double-Blades |
| title_short | Numerical Investigation of the Tip Vortex of a Straight-Bladed Vertical Axis Wind Turbine with Double-Blades |
| title_sort | numerical investigation of the tip vortex of a straight bladed vertical axis wind turbine with double blades |
| topic | wind energy vertical axis wind turbine (VAWT) flow field tip vortex wind velocity deficit torque coefficient |
| url | https://www.mdpi.com/1996-1073/10/11/1721 |
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