Effect of Blade Pitch Angle on the Aerodynamic Characteristics of a Straight-bladed Vertical Axis Wind Turbine Based on Experiments and Simulations

Yang, Yanzhao; Guo, Zhiwei; Song, Qingyang; Zhang, Yanfeng; Li, Qingan

doi:10.3390/en11061514

Cited by 33 publications

(21 citation statements)

References 27 publications

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“…The degree of freedom between the groups (DoFB) is the value of that group number minus 1. Fvalue is determined as follows: (11) The standard F value is determined from an F-table for a given statistical level of the significance. In this paper, the standard F value at the 5% significance level is 2.8661 when the DoFW and DoFB are 20 and 4, respectively [59].…”

Section: Resultsmentioning

confidence: 99%

“…Experimental studies on VAWTs are direct and effective. Li et al [7][8][9][10][11][12] implemented numerous experiments in a wind tunnel and obtained many valuable results. They concluded that the power coefficient decreases with an increase in the number of blades and that two blades have a higher annual generating capacity in high wind velocity regions [7].…”

Section: Current Study On Vawtsmentioning

confidence: 99%

“…They concluded that the power coefficient decreases with an increase in the number of blades and that two blades have a higher annual generating capacity in high wind velocity regions [7]. Through change in the pitch angle of the blade, they found that an optimum pitch angle (6°) can effectively improve the power efficiency of their turbine design [11]. In addition, the Reynolds number and solidity of the rotor also affects the performance of the VAWTs [8,9].…”

Section: Current Study On Vawtsmentioning

confidence: 99%

“…In this paper, an optimal pitch angle = 6° [11] is adopted so that the VAWT operates in the optimal condition. In this case, the real attack angle of the blade is giving by…”

Section: Physical Model Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Winglet design for vertical axis wind turbines based on a design of experiment and CFD approach

Zhang

Elsakka

Huang

et al. 2019

Energy Conversion and Management

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Vertical axis wind turbines (VAWTs) have been attracting an increasing attention in recent years because of their potential for effectively using wind energy. The tip vortices from the VAWT blades have a negative impact on the power efficiency. Since a winglet has been proved to be effective in decreasing the tip vortex in the aerospace field, this paper numerically studies the aerodynamic effect of appending a winglet on the blade of a VAWT. Based on the theoretical motion pattern of the VAWT blade, this paper simplifies the three-dimensional fullscale rotor simulation to a one-blade oscillating problem in order to reduce the computational cost. The full rotor model simulation is also used in validating the result. The numerical approach has been validated by the experimental data that is available in the open literature. Six parameters are applied in defining the configuration of the winglet. The orthogonal experimental design (OED) approach is adopted in this paper to determine the significance of the design parameters that affect the rotor's power coefficient. The OED results show that the twist angle of the winglet is the most significant factor that affects the winglet's performance. A range analysis of the OED results produces an optimal variable arrangement in the current scope, and the winglet's performance in this variable arrangement is compared with the blade without a winglet. For the single blade study, the comparison result shows that the optimal 2 winglet can decrease the tip vortices and improve the blade's power performance by up to 31% at a tip speed ratio of 2.29. However, for the full VAWT case, the relative enhancement in the power coefficient is about 10.5, 6.7, and 10.0% for TSRs of 1.85, 2.29, and 2.52, respectively. The winglet assists in maintain the pressure difference between the two sides of the blade, thus weakening the tip vortex and improving the aerodynamic efficiency of the surface near the blade tip.

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Section: Resultsmentioning

confidence: 99%

Section: Current Study On Vawtsmentioning

confidence: 99%

Section: Current Study On Vawtsmentioning

confidence: 99%

“…In this paper, an optimal pitch angle = 6° [11] is adopted so that the VAWT operates in the optimal condition. In this case, the real attack angle of the blade is giving by…”

Section: Physical Model Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Winglet design for vertical axis wind turbines based on a design of experiment and CFD approach

Zhang

Elsakka

Huang

et al. 2019

Energy Conversion and Management

View full text Add to dashboard Cite

show abstract

“…Coming to the scientific literature, it is clear that there is a general challenge for optimizing wind energy performance and applies to all type of turbines, including vertical rotors [24]. Again, it is important to highlight that the general approach for dealing with pitch misalignment involves a combined study in conjunction with other parameters related to wind turbine general misalignments and balance.…”

Section: State Of the Artmentioning

confidence: 99%

Pitch Angle Misalignment Correction Based on Benchmarking and Laser Scanner Measurement in Wind Farms

Elosegui¹,

Egana²,

Ulazia

et al. 2018

Energies

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In addition to human error, manufacturing tolerances for blades and hubs cause pitch angle misalignment in wind turbines. As a consequence, a significant number of turbines used by existing wind farms experience power production loss and a reduced turbine lifetime. Existing techniques, such as photometric technology and laser-based methods, have been used in the wind industry for on-field pitch measurements. However, in some cases, regular techniques have difficulty achieving good and accurate measurements of pitch angle settings, resulting in pitch angle errors that require cost-effective correction on wind farms. Here, the authors present a novel patented method based on laser scanner measurements. The authors applied this new method and achieved successful improvements in the Annual Energy Production of various wind farms. This technique is a benchmarking-based approach for pitch angle calibration. Two case studies are introduced to demonstrate the effectiveness of the pitch angle calibration method to yield Annual Energy Production increase.

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Numerical Investigations of Variable Pitch Straight-Bladed H-Darrieus VAWT

Miliket

Ageze

Tigabu

2022

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

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Effect of Blade Pitch Angle on the Aerodynamic Characteristics of a Straight-bladed Vertical Axis Wind Turbine Based on Experiments and Simulations

Cited by 33 publications

References 27 publications

Winglet design for vertical axis wind turbines based on a design of experiment and CFD approach

Winglet design for vertical axis wind turbines based on a design of experiment and CFD approach

Pitch Angle Misalignment Correction Based on Benchmarking and Laser Scanner Measurement in Wind Farms

Numerical Investigations of Variable Pitch Straight-Bladed H-Darrieus VAWT

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