Aerodynamic design methodology for wind tunnel tests of wind turbine rotors

Bayati, Ilmas; Belloli, Marco; Bernini, Luca; Zasso, Alberto

doi:10.1016/j.jweia.2017.05.004

Cited by 82 publications

(47 citation statements)

References 12 publications

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“…The model wind turbine is a dynamically scaled model of the DTU 10MW reference wind turbine ( [11], [12]) and has a radius of R = 1.19 m. The turbine is considered working at rated operating conditions, corresponding to an inflow velocity of u = 4 m s −1 , a tip speed ratio of λ = 7 and a rotational velocity of 241 rpm. No real-time controller is used neither in the experiments nor in the simulations.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Cormier

Caboni

Lutz

et al. 2018

J. Phys.: Conf. Ser.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Cormier

Caboni

Lutz

et al. 2018

J. Phys.: Conf. Ser.

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“…The Re for the airflow over the airfoil is expressed mathematically in Equation (1) [39]. For a typical airfoil in a wind turbine blade section, the relationship between the free stream airflow speed and the relative airflow speed at the airfoil is expressed in Equation (2) [29].…”

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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“…The measurable result needs to be reanalyzed again by adding correction factors of the obstacle, which is known as blockage correction factor (Ѱ) [15], [21]- [26], therefore, in this study the calculation of blockage factor on wind tunnel which is used to calculate the value of l/h = 10/30 = 0.3 because l/h ,0.5 [26]. The equation can be written as below…”

Section: Experimental Setup On Wind Tunnelmentioning

confidence: 99%

“…The method of theory simulation was done by using blade element momentum (BEM), which served as the experiment result in comparison from the method of blade enumeration into a number of segments hence the optimum pitch angle value can be determined based on the lift and drag coefficient values gained from a number of segments the blade. Therefore, it figured out that the data used for finding out the characteristics of the performance of variations were determined on the system [15].…”

Section: Introductionmentioning

confidence: 99%

The Experimental investigation and Numerical Analysis on Horizontal Axis Wind Turbine with Winglet and Pitch Variations

Satwika¹,

Hantoro²,

Sarwono³

et al. 2019

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HAWT with three blades often used because it has the highest coefficient of performance among other turbines. The airfoil used is Clark-Y type because it has a high glide ratio (coefficient lift/coefficient drag) in the application of subsonic flow. The main purpose of this study is to increase the power coefficient value obtained by the increase of lift force on each airfoil of blade compiler and to fix the wind turbine performance. One of the variations added is the addition of winglets on the tip of the blade. The method employed is a laboratory scaled experiment by using wind tunnel. Theoretically, this study also applied blade element momentum (BEM) as the calculation of each segment on the airfoil, and the simulation was carried out with computational fluid dynamics (CFD), in order to find out the characteristics of flow passing by the rotor. The advantage of using winglets is, fostering the condition of starting wind turbine rotor on low tip speed ratio (TSR) condition by varying the pitch angle on the blade. The addition of pitch variation gives an advantage that it can maximize the wind speed towards the angle of attack to the airfoil; hence, it increases the aerodynamic effect on the rotor.

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Aerodynamic design methodology for wind tunnel tests of wind turbine rotors

Cited by 82 publications

References 12 publications

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

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

The Experimental investigation and Numerical Analysis on Horizontal Axis Wind Turbine with Winglet and Pitch Variations

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