Influences of some parameters on the performance of a small vertical axis wind turbine

Dumiţrache, Alexandru; Frunzulică, Florin; Dumitrescu, Horia; Suatean, Bogdan

doi:10.1051/rees/2016024

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…As noticed, for all cases, an increase in TSR leads to an increase in the obtained C p , which is expected. This trend matches well with existing literature, which shows that using the Vortex model, the C p for 3 bladed VAWTs is expected to rise until the TSR reaches the value of 5 [23]. The increase in C p was most experienced by VAWTs with a 0-degree blade pitch or with a negative 2-degree blade pitch and least with the 6-degree blade pitch.…”

Section: Resultssupporting

confidence: 89%

Performance Analysis of H-Darrieus Wind Turbine with NACA0018 and S1046 Aerofoils: Impact of Blade Angle and TSR

Tahzib

Hannan

Ahmed

et al. 2022

CFDL

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Despite the widespread research and development of HAWTs in recent times, VAWTs are gaining in popularity due to certain critical advantages they provide, for example, wind direction independency. While most existing studies focused on analysing the performance of VAWT using NACA aerofoils, this study compares the performance of NACA0018 and S1046 aerofoil profiles for a range of Speed Ratios (TSRs) and blade pitch angles. It has been found that the S1046 is less sensitive to changes in wind speed, and is thus, a superior choice for urban applications where the wind speed is comparatively low and varies a lot. Three bladed VAWTs of solidity 0.1 was modelled using Solidworks for this study. The CFD simulations were then performed in ANSYS Fluent, utilising the k-ω SST turbulence model. The model was validated at first before analysing the VAWT performance with the intended aerofoils. Key results indicate that increasing the TSR leads to increases in aerodynamic performances for nearly all cases, and especially so, for lower blade pitch angles. However, this study concludes that VAWT consisting of S1046 aerofoils at -2 degrees of blade pitch and operating at TSR 4 will provide the optimum performance.

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Section: Resultssupporting

confidence: 89%

Performance Analysis of H-Darrieus Wind Turbine with NACA0018 and S1046 Aerofoils: Impact of Blade Angle and TSR

Tahzib

Hannan

Ahmed

et al. 2022

CFDL

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“…It was reported that the VAT has the lowest self-starting capability with NACA 0012 [8] and a highest capability with NACA 0021, among the various symmetric airfoils investigated [9]. Different blade geometries have been proposed and tested to improve the self-starting capability of the VAT [10][11][12][13][14][15][16]. The blade pitch control was also found to be an effective method for the VAT to have a better self-starting capability [17,18].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Self-Starting Performance of Darrieus Vertical Axis Turbine for Tidal Stream Energy Conversion

Liu

Shi

2016

Energies

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Self-starting performance is a key factor in the evaluation of a Darrieus straight-bladed vertical axis turbine. Most traditional studies have analyzed the turbine's self-starting capability using the experimental and numerical data of the forced rotation. A 2D numerical model based on the computational fluid dynamics (CFD) software ANSYS-Fluent was developed to simulate the self-starting process of the rotor at constant incident water-flow velocities. The vertical-axis turbine (VAT) rotor is driven directly by the resultant torque generated by the water flow and system loads, including the friction and reverse loads of the generator. It is found that the incident flow velocity and the moment of inertia of the rotor have little effect on the averaged values of tip-speed ratios in the equilibrium stage under no-load conditions. In the system load calculations, four modes of the self-starting were found: stable equilibrium mode, unstable equilibrium mode, switch mode and halt mode. The dimensionless power coefficient in the simulations of passive rotation conditions is found to be, on average, 38% higher than those achieved in the simulations of forced rotation conditions.

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“…Vertical Axis Wind Turbines (VAWTs) have drawn much attention of research and industry due to their potential to be installed in urban and offshore regions, and in particular where the wind resource λ Tip speed ratio, ωR/V ∞ ω Rotational speed, rad/s presents highly variable wind speed and direction [1]. In order to understand its aerodynamics, many authors have used URANS Computational Fluid Dynamics (CFD) simulations to explore qualitatively the influence of the aerofoil profile [2,3,4,5], the pitch angle [6,7,8], Reynolds number [9,10,11,12] and the number of blades [1,13,7,14] on the power coefficient.…”

Section: Introductionmentioning

confidence: 99%

A critical analysis of the stall onset in vertical axis wind turbines

Hau

Ingham

et al. 2020

Journal of Wind Engineering and Industrial Aerodynamics

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The dynamic stall phenomenon in Vertical Axis Wind Turbines (VAWTs) appears, under some operating conditions, to be not very well defined, such as at a low tip speed ratio. Some studies have focused on describing the topology of the dynamic stall but little attention has been paid to understand how all the operating VAWT parameters influence the moment of stall inception. This paper focuses on analysing the influence of the tip speed ratio, pitch angle, reduced frequency, relative velocity and Reynolds number on the stall-onset angle of VAWTs. CFD simulations with an oscillating NACA0015 describing the angle of attack and relative velocity in VAWTs were employed. The results have revealed that an increase in the stall-onset occurs anytime the operating parameters increase the value of the non-dimensional pitch rate and the Reynolds number at the moment the angle of attack approaches to the static stall angle. The stall-onset angle showed a linear increase with the non-dimensional pitch rate in the range of Reynolds number tested, namely 0.8 − 3.3 × 10 5 . This paper has elucidated how the several parameters governing VAWTs operation effect the stall-onset angle and therefore has contributed to a much better understanding of the causes that induce the stall in these devices.

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Influences of some parameters on the performance of a small vertical axis wind turbine

Cited by 5 publications

References 4 publications

Performance Analysis of H-Darrieus Wind Turbine with NACA0018 and S1046 Aerofoils: Impact of Blade Angle and TSR

Performance Analysis of H-Darrieus Wind Turbine with NACA0018 and S1046 Aerofoils: Impact of Blade Angle and TSR

Numerical Study on Self-Starting Performance of Darrieus Vertical Axis Turbine for Tidal Stream Energy Conversion

A critical analysis of the stall onset in vertical axis wind turbines

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