Investigation of aerodynamic performance characteristics of a wind-turbine-blade profile using the finite-volume method

Erkan, Onur; Özkan, Musa; Karakoç, T. Hikmet; Garrett, S. D.; Thomas, Peter J.

doi:10.1016/j.renene.2020.07.138

Cited by 22 publications

(14 citation statements)

References 36 publications

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“…The flow around the anomalous geometries in this study and in the vortex street is inherently turbulent and occasionally laminar in the freestream, thus, the SST k − ω turbulence model was used to close the RANS equations and to ensure the closure problem. The SST model was preferred as it was previously proven to be able to switch effectively between laminar and turbulent regions of the flow (Özkan et al 2017, Erkan et al 2020).…”

Section: Numerical Modelmentioning

confidence: 99%

Numerical and experimental investigation of the aerodynamic performance of anomalous energy harvester geometries

Özkan¹,

Erkan²,

Başaran³

et al. 2022

J. Phys. D: Appl. Phys.

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In this study, anomalous geometries were examined computationally and experimentally in terms of their aerodynamic performance as energy harvesters. The main motivation of this study is that most of these geometries, discussed in the present study, have not been previously considered as energy harvesters in literature. Some well-known geometries alongside these anomalous models were also investigated for comparison in this current study. The examination was conducted by means of the computational and experimental fluid dynamics approaches where the flow around these different models was analyzed in detail to shed light on the crucial aspects encountered during the flow separation over these various geometries. By this means, the lift coefficients of the investigated harvester geometries were considered as the essential parameter for time-dependent analyses in the numerical simulations since this parameter is the main reason for the flow-induced vibrations. Moreover, experimentally obtained voltages and power curves were compared for different geometries. Based on the root mean square values of the numerical lift coefficients, it was found that the best aerodynamically beneficial model is Model-7 (equal-length 3-tines fork shape) and the worst model is Model-5 (perpendicular plane). Velocity vectors and pressure distributions around these best and worst models were also provided to reveal the main differences in flow structures that may lead to a better design of energy harvester geometry for further studies.

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Section: Numerical Modelmentioning

confidence: 99%

Numerical and experimental investigation of the aerodynamic performance of anomalous energy harvester geometries

Özkan¹,

Erkan²,

Başaran³

et al. 2022

J. Phys. D: Appl. Phys.

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“…All flow simulations were performed by ANSYS FLUENT that enables the solution of equations governing the planar, incompressible, viscous, both steady and transient (at higher AoAs) flow by finite volume method. Quite conservative approach to flow modelling was adopted, similar to the one described by Erkan et al (2020) and Saffarian et al (2020).…”

Section: Airfoil Performancementioning

confidence: 99%

“…In certain geometric aspects, it Because the previously described optimization was based on the estimation of airfoil aerodynamic performances by XFOIL, it is recommended to validate these airfoil properties by a more complex model that takes more flow physicality into account. Because the airfoil is meant to operate at low-Re of 300,000 where laminar separation bubble is expected to appear at medium and high angles-of-attack (AoA) (as investigated by Erkan et al (2020) and Somashekar and Immanuel Selwyn Raj, 2020), transition SST turbulence model was used.…”

Section: Airfoil Performancementioning

confidence: 99%

Optimal propeller blade design, computation, manufacturing and experimental testing

Kovačević

Svorcan

Hasan

et al. 2021

AEAT

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Purpose Modern unmanned air vehicles (UAVs) are usually equipped with rotors connected to electric motors that enable them to hover and fly in all directions. The purpose of the paper is to design optimal composite rotor blades for such small UAVs and investigate their aerodynamic performances both computationally and experimentally. Design/methodology/approach Artificial intelligence method (genetic algorithm) is used to optimize the blade airfoil described by six input parameters. Furthermore, different computational methods, e.g. vortex methods and computational fluid dynamics, blade element momentum theory and finite element method, are used to predict the aerodynamic performances of the optimized airfoil and complete rotor as well the structural behaviour of the blade, respectively. Finally, composite blade is manufactured and the rotor performance is also determined experimentally by thrust and torque measurements. Findings Complete process of blade design (including geometry definition and optimization, estimation of aerodynamic performances, structural analysis and blade manufacturing) is conducted and explained in detail. The correspondence between computed and measured thrust and torque curves of the optimal rotor is satisfactory (differences mostly remain below 15%), which validates and justifies the used design approach formulated specifically for low-cost, small-scale propeller blades. Furthermore, the proposed techniques can easily be applied to any kind of rotating lifting surfaces including helicopter or wind turbine blades. Originality/value Blade design methodology is simplified, shortened and made more flexible thus enabling the fast and economic production of propeller blades optimized for specific working conditions.

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“…The effect of the angle of attack and Reynolds number has been intensively studied for many different profiles of turbine blades [18]. The lift coefficient and the drag coefficient, which characterize the lift force and the drag force acting on the airfoil, are examined in [19] for various angles of attack at different Reynolds numbers. The aerodynamic performance of both permeable wing and airfoil is presented in [20] in terms of lift, drag, lift to drag ratio, and moment coefficients by varying permeability values and permeable sections.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Characteristics of a Single Airfoil for Vertical Axis Wind Turbine Blades and Performance Prediction of Wind Turbines

Mitchell

Ogbonna

Волков

2021

Fluids

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The design of wind turbines requires a deep insight into their complex aerodynamics, such as dynamic stall of a single airfoil and flow vortices. The calculation of the aerodynamic forces on the wind turbine blade at different angles of attack (AOAs) is a fundamental task in the design of the blades. The accurate and efficient calculation of aerodynamic forces (lift and drag) and the prediction of stall of an airfoil are challenging tasks. Computational fluid dynamics (CFD) is able to provide a better understanding of complex flows induced by the rotation of wind turbine blades. A numerical simulation is carried out to determine the aerodynamic characteristics of a single airfoil in a wide range of conditions. Reynolds-averaged Navier–Stokes (RANS) equations and large-eddy simulation (LES) results of flow over a single NACA0012 airfoil are presented in a wide range of AOAs from low lift through stall. Due to the symmetrical nature of airfoils, and also to reduce computational cost, the RANS simulation is performed in the 2D domain. However, the 3D domain is used for the LES calculations with periodical boundary conditions in the spanwise direction. The results obtained are verified and validated against experimental and computational data from previous works. The comparisons of LES and RANS results demonstrate that the RANS model considerably overpredicts the lift and drag of the airfoil at post-stall AOAs because the RANS model is not able to reproduce vorticity diffusion and the formation of the vortex. LES calculations offer good agreement with the experimental measurements.

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Investigation of aerodynamic performance characteristics of a wind-turbine-blade profile using the finite-volume method

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 22 publications

References 36 publications

Numerical and experimental investigation of the aerodynamic performance of anomalous energy harvester geometries

Numerical and experimental investigation of the aerodynamic performance of anomalous energy harvester geometries

Optimal propeller blade design, computation, manufacturing and experimental testing

Aerodynamic Characteristics of a Single Airfoil for Vertical Axis Wind Turbine Blades and Performance Prediction of Wind Turbines

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