Airfoil Lift and Drag Extrapolation with Viterna and Montgomerie Methods

Mahmuddin, Faisal; Klara, Syerly; Sitepu, Husni; Hariyanto, Surya

doi:10.1016/j.egypro.2017.03.394

Cited by 23 publications

(15 citation statements)

References 1 publication

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“…In this study, the Montogomerie Method is used as it includes advanced features enabling incorporation of the airfoil's camber, skin friction and leading edge radius [54] which the authors will use in future studies. This method has been proven to be as good as others in predicting aerodynamic performance [55].…”

Section: Data Extrapolationmentioning

confidence: 97%

Double-Multiple Streamtube Analysis of a Flexible Vertical Axis Wind Turbine

Roy

Kincaid

Mahmud

et al. 2021

Fluids

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Vertical-axis wind turbines (VAWTs) have drawn increased attention for off-grid and off-shore power generation due to inherent advantages over the more popular horizontal-axis wind turbines (HAWTs). Among these advantages are generator locale, omni-directionality and simplistic design. However, one major disadvantage is lower efficiency, which can be alleviated through blade pitching. Since each blade must transit both up- and down-stream each revolution, VAWT blade pitching techniques are not yet commonplace due to increased complexity and cost. Utilizing passively-morphing flexible blades can offer similar results as active pitching, requiring no sensors or actuators, and has shown promise in increasing VAWT performance in select cases. In this study, wind tunnel tests have been conducted with flexible and rigid-bladed NACA 0012 airfoils, in order to provide necessary input data for a Double-Multiple Stream-Tube (DMST) model. The results from this study indicate that a passively-morphing VAWT can achieve a maximum power coefficient (Cp) far exceeding that for a rigid-bladed VAWT CP (18.9% vs. 10%) with reduced normal force fluctuations as much as 6.9%. Operational range of tip-speed ratio also is observed to increase by a maximum of 40.3%.

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Section: Data Extrapolationmentioning

confidence: 97%

Double-Multiple Streamtube Analysis of a Flexible Vertical Axis Wind Turbine

Roy

Kincaid

Mahmud

et al. 2021

Fluids

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“…Another source of error is from the extrapolation of the initial data obtained from XFOIL as the airfoil characteristics are required for 360 • . Regarding the extrapolation, Montgomerie [37,38] and Viterna [39] are the most widely used methods. The Montgomery method is founded on the assumption as a thin plate, whereas the Viterna method is formulated on the basis of the potential flow theory.…”

Section: Qblade Validationmentioning

confidence: 99%

Aerodynamic Simulations for Floating Darrieus-Type Wind Turbines with Three-Stage Rotors

et al. 2020

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Growing energy demand is causing a significant decrease in the world’s hydrocarbon stock in addition to the pollution of our ecosystem. Based on this observation, the search for alternative sorts of energy to fossil fuels is being increasingly explored and exploited. Wind energy is experiencing a very important development, and it offers a very profitable opportunity for exploitation since the wind is always available and inexhaustible. Several technical solutions exist to exploit wind energy, such as floating vertical axis wind turbines (F-VAWTs), which provide an attractive and cost-effective solution for exploiting higher resources of offshore wind in deep water areas. Recently, the use of the Darrieus vertical axis wind turbine (VAWT) offshore has attracted increased interest because it offers significant advantages over horizontal axis wind turbines (HAWTs). In this context, this article presents a new concept of floating Darrieus-type straight-bladed turbine with three-stage rotors. A double-multiple stream tube (DMST) model is used for aerodynamic simulations to examine several critical parameters, including, solidity turbine, number of blades, rotor radius, aspect ratio, wind velocity, and rotor height. This study also allows to identify a low solidity turbine (σ = 0.3), offering the best aerodynamic performance, while a two-bladed design is recommended. Moreover, the results also indicate the interest of a variable radius rotor, as well as the variation of the height as a function of the wind speed on the aerodynamic efficiency.

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“…A maximum lift to drag ratio of 141.4 was found. To have the overall distribution from –180° to 180°, an extrapolation of the polar coordinates was done using Viterna method (Mahmuddin et al, 2017).…”

Section: Small Wind Turbine Blade Structurementioning

confidence: 99%

Structural design and analysis of a small wind turbine blade using Simple Load Model, FAST-MLife codes, and ANSYS nCode DesignLife

et al. 2019

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This article presents a structural design and analysis of 11-kW small wind blades. The stress and the fatigue on the blades were computed using Simple Load Model from IEC 61400-2 standard, ANSYS nCode DesignLife, and FAST-MLife codes from the National Renewable Energy Laboratory. Simple Load Model gives good results in terms of stress analysis but overestimates fatigue damage on the blade. High safety factors imposed by the IEC 61400-2 standard, when full mechanical characterization of the blade material cannot be achieved, lead to heavy structures that impact the blade cost. For the same design, full computational analysis of the blade fatigue using FAST-MLife codes and the ANSYS nCode DesignLife revealed that the rotor blades will be safe against fatigue for a design lifetime of 20 years. This study shows that simple and reliable aeroelastic models are still needed for fatigue analysis of small wind blades.

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Airfoil Lift and Drag Extrapolation with Viterna and Montgomerie Methods

Cited by 23 publications

References 1 publication

Double-Multiple Streamtube Analysis of a Flexible Vertical Axis Wind Turbine

Double-Multiple Streamtube Analysis of a Flexible Vertical Axis Wind Turbine

Aerodynamic Simulations for Floating Darrieus-Type Wind Turbines with Three-Stage Rotors

Structural design and analysis of a small wind turbine blade using Simple Load Model, FAST-MLife codes, and ANSYS nCode DesignLife

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