Power performance assessment of H-rotor vertical axis wind turbines with different aspect ratios in turbulent flows via experiments

Peng, H.Y.; Lam, Heung-Fai; Liu, H.J.

doi:10.1016/j.energy.2019.01.140

Cited by 37 publications

(5 citation statements)

References 28 publications

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“…Mast parameters of the SDOF model of the H-type and hybrid VAWTs are listed in Table 3. For different mast parameters with the mast height varying from 1 to 4 m and the mast diameter varying from 66.7 to 200 mm, natural frequencies of the SDOF model of the H-type and hybrid VAWTs are obtained from Equation (17), as shown in Table 4, where cross-section dimensions, lengths, and densities of each element of the mast of the two VAWTs are specified. The natural frequency decreases with the mast height for both the H-type and hybrid VAWTs.…”

Section: Sdof Resultsmentioning

confidence: 99%

Free and Forced Vibration Analysis of H-type and Hybrid Vertical-Axis Wind Turbines

et al. 2020

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Vertical-axis wind turbines (VAWTs) are compact and efficient and have become increasingly popular for wind energy harvesting. This paper mainly focuses on free and forced vibration analysis of two different types of VAWTs, i.e., an H-type VAWT and a new hybrid VAWT. The H-type VAWT has a lower cost, while the hybrid VAWT has a better self-starting capability at a low wind velocity. Both of them can be used for wind energy harvesting. By using the assumed modes method, the two VAWTs are simplified by a single degree-of-freedom (SDOF) model. By utilizing the method of structural mechanics, a multi-degree-of-freedom (MDOF) model is developed for the two VAWTs and the turbines in them are reasonably simplified. Natural frequency analyses for the SDOF and MDOF models of the two VAWTs are conducted. A beam element model (BEM) of the two VAWTs is created to calculate their natural frequencies and mode shapes and to verify natural frequency results from the SDOF and MDOF models. By using the BEM of the two VAWTs, their amplitude-frequency responses are obtained from harmonic response analysis. To analyze forced vibrations of the two VAWTs, aerodynamic loads on the two VAWTs are obtained from computational fluid dynamics (CFD) simulation. By using solid element models of the two VAWTs, forced transient responses of the two VAWTs are calculated by using the aerodynamic loads from CFD simulation. Steady-state forced response amplitudes of the 1 m-mast hybrid VAWT are 23.8% and 20.5% smaller in X- and Y-directions than those of the 1 m-mast H-type VAWT, respectively. Frequency contents of the aerodynamic loads from CFD simulation are calculated, which confirm that they are periodic, and the power efficiency of the H-type VAWT is about 2.6% higher that of the hybrid VAWT.

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Section: Sdof Resultsmentioning

confidence: 99%

Free and Forced Vibration Analysis of H-type and Hybrid Vertical-Axis Wind Turbines

et al. 2020

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“…Where is P is a mechanical power in watt ρ is a wind density in kg/m 3 A is the cross section area of each blade (swept area) in m 2 V is the wind speed in m/s The electrical power can also extracted by the equation above through the wind turbine efficiency, where this efficiency can be expressed by a collection of variables that are determined by taking the design, wind resistance and turbulence as a factors and explained with limit called Betz limit [17,18]. The (2) below can be used to represent the electrical power in terms of object efficiency.…”

Section: Wind Turbine Modelingmentioning

confidence: 99%

Highway wind power energy assessment of Al-Durra highway street in Baghdad, Iraq

Raheem

Ibraheem²

2020

IJPEDS

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In certain spots on the planet which have less attainable of utilizing enormous breeze power plants, the expressway wind vitality can be utilized to help little loads in the main grids. Interstates road lighting for instance of that heaps that is expending a great deal of vitality and cost every year. When the vitality that originates from vehicles development along the highway avenues can be taken in thought, this paper has examined the outcomes if moment vehicles wind speed during 24 hours per day. 24 hours, brief interim of vehicles wind speeds have been estimated by utilizing anemometer put in the road. A vertical pivot wind turbine (VAWT) has been proposed to be utilized in this task. All venture regulation has been simulated by utilizing Opendss program; it can support time series simulation. The outcomes demonstrated that the undertaking is possible to be utilized in Al-Durra Highway Street. The normal breeze speed of moving vehicles is 4.7 m/s which can deliver 67.3 watt by the proposed turbine. The got energy saw that it as contributed to be utilized by the maingrid during the day time. All the demonstrated bends of the outcomes speak to the Iraq grid support by diminishing the main demand and operational expenses too.

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“…A high-solidity VAWT is selected for this study. Compared with the low-solidity VAWT, the high-solidity VAWT has a larger blade chord that can reduce the degradation of blade performance caused by turbulence [20] , but when the TSR deviates from the optimal value in a decreasing manner, the fluctuation range of the AoA increases at a faster rate and the flow separation becomes very rapid [21] . Consequently, the flow separation of the high-solidity VAWT deserves more attention.…”

Section: Introductionmentioning

confidence: 99%

Flow control for high-solidity vertical axis wind turbine based on adaptive flap

Hao

Bashir

et al. 2021

Energy Conversion and Management

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Power performance assessment of H-rotor vertical axis wind turbines with different aspect ratios in turbulent flows via experiments

Cited by 37 publications

References 28 publications

Free and Forced Vibration Analysis of H-type and Hybrid Vertical-Axis Wind Turbines

Free and Forced Vibration Analysis of H-type and Hybrid Vertical-Axis Wind Turbines

Highway wind power energy assessment of Al-Durra highway street in Baghdad, Iraq

Flow control for high-solidity vertical axis wind turbine based on adaptive flap

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