Aerodynamic shape optimization and analysis of small wind turbine blades employing the Viterna approach for post-stall region

Hassanzadeh, Arash; Hassanabad, Armin Hassanzadeh; Dadvand, Abdolrahman

doi:10.1016/j.aej.2016.07.008

Cited by 66 publications

(31 citation statements)

References 13 publications

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“…This has been mainly due to the agreement of the theory with experimental data. Several studies on wind turbine rotor design have demonstrated the robustness of BEMT in wind turbine rotor analysis [33,35,[41][42][43]. The BEMT equations used for the rotor development are expressed in Equations (6)-(10) [40].…”

Section: Mathematical Frameworkmentioning

confidence: 99%

Development of High Performance Airfoils for Application in Small Wind Turbine Power Generation

et al. 2020

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Small wind turbine power generation systems have the potential to meet the electricity demand of the residential sector in developing countries. However, due to their exposure to low Reynolds number (Re) flow conditions and associated problems, specific airfoils are required for the design of their blades. In this research, XFOIL was used to develop and test three high performance airfoils (EYO7-8, EYO8-8, and EYO9-8) for small wind turbine application. The airfoils were subsequently used in conjunction with Blade Element Momentum Theory to develop and test 3-bladed 6 m diameter wind turbine rotors. The aerodynamic performance parameters of the airfoils tested were lift, drag, lift-to-drag ratio, and stall angle. At Re = 300,000, EYO7-8, EYO8-8, and EYO9-8 had maximum lift-to-drag ratios of 134, 131, and 127, respectively, and maximum lift coefficients of 1.77, 1.81, and 1.81, respectively. The stall angles were 12°for EYO7-8, 14°for EYO8-8, and 15°for EYO9-8. Together, the new airfoils compared favourably with other existing low Re airfoils and are suitable for the design of small wind turbine blades. Analysis of the results showed that the performance improvement of the EYO-Series airfoils is as a result of the design optimization that employed an optimal thickness-to-camber ratio (t/c) in the range of 0.85-1.50. Preliminary wind turbine rotor analysis also showed that the EYO7-8, EYO8-8, and EYO9-8 rotors had maximum power coefficients of 0.371, 0.366, and 0.358, respectively.

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Section: Mathematical Frameworkmentioning

confidence: 99%

Development of High Performance Airfoils for Application in Small Wind Turbine Power Generation

et al. 2020

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“…The previous equations have been written in terms of the pitch angle β and the tip speed ratio λ, which is defined as rel RV   (6) The mechanical power of HAWT in Watt can be derived by integrating the mechanical torque of the blade multiplied by the rotational speed of the blades and the number of blades N:…”

Section: Subject Theorymentioning

confidence: 99%

“…They found good agreement between measured and computed performance. The Blade Element Momentum theory was employed by Hassanzadeh et al [6] to optimize the horizontal-axis wind turbine (HAWT) blade. They used Viterna equations for deducing airfoil data into the post-stall regime and demonstrated the high capability of this method to predict the performance of wind turbines.…”

Section: Introductionmentioning

confidence: 99%

Small Wind Turbine Blade Design and Optimization

2019

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This work aims at designing and optimizing the performance of a small Horizontal-Axis-Wind-Turbine to obtain a power coefficient (C P ) higher than 40% at a low wind speed of 5 m/s. Two symmetric in shape airfoils were used to get the final optimized airfoil. The main objective is to optimize the blade parameters that influence the design of the blade since the small turbines are prone to show low performance due to the low Reynolds number as a result of the small size of the rotor and the low wind speed. Therefore, the optimization process will select different airfoils and extract their performance at the design conditions to find the best sections which form the optimal design of the blade. The sections of the blade in the final version mainly consist of two different sections belong to S1210 and S1223 airfoils. The optimization process goes further by investigating the performance of the final design, and it employs the blade element momentum theory to enhance the design. Finally, the rotor-design was obtained, which consists of three blades with a diameter of 4 m, a hub of 20 cm radius, a tip-speed ratio of 6.5 and can obtain about 650 W with a Power coefficient of 0.445 at a wind-speed of 5.5 m/s, reaching a power of 1.18 kW and a power coefficient of 0.40 at a wind-speed of 7 m/s.

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“…For instance, Kenway and Martins [12] showed a possible 3-4% increase in the power output using the optimum blade shape determined by a multidisciplinary design feasible (MDF) approach, and Clifton-Smith and Wood [13] employed a differential evolution method focusing on improving the turbine starting performance. Other multi-criteria design methods aim to solve an optimization problem of minimizing blade vibration and maximizing the output power under the constraint of sufficient blade structure stability [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Wind Turbines with Truncated Blades May Be a Possibility for Dense Wind Farms

2020

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We experimentally explored the impact of a wind turbine with truncated blades on the power output and wake recovery, and its effects within 2 × 3 arrays of standard units. The blades of the truncated turbine covered a fraction of the outer region of the rotor span and replaced with a zero-lift structure around the hub, where aerodynamic torque is comparatively low. This way, the incoming flow around the hub may be used as a mixing enhancement mechanism and, consequently, to reduce the flow deficit in the wake. Particle image velocimetry was used to characterize the incoming flow and wake of various truncated turbines with a variety of blade length ratios L / R = 0.6 , 0.7, and 1, where L is the length of the working section of the blade of radius R. Power output was obtained at high frequency in each of the truncated turbines, and also at downwind units within 2 × 3 arrays with streamwise spacing of Δ x / d T = 4 , 5, and 6, with d T being the turbine diameter. Results show that the enhanced flow around the axis of the rotor induced large-scale instability and mixing that led to substantial power enhancement of wind turbines placed 4 d T downwind of the L / R = 0.6 truncated units; this additional power is still relevant at 6 d T . Overall, the competing factors defined by the expected power reduction of truncated turbines due to the decrease in the effective blade length, the need for reduced components of the truncated units, and enhanced power output of downwind standard turbines suggest a techno-economic optimization study for potential implementation.

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Aerodynamic shape optimization and analysis of small wind turbine blades employing the Viterna approach for post-stall region

Cited by 66 publications

References 13 publications

Development of High Performance Airfoils for Application in Small Wind Turbine Power Generation

Development of High Performance Airfoils for Application in Small Wind Turbine Power Generation

Small Wind Turbine Blade Design and Optimization

Wind Turbines with Truncated Blades May Be a Possibility for Dense Wind Farms

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