Investigation of blade performance of horizontal axis wind turbine based on blade element momentum theory (BEMT) using NACA airfoils

Tenguria, Nitin; Mittal, N. D.; Ahmed, Siraj

doi:10.4314/ijest.v2i12.64565

Cited by 16 publications

(16 citation statements)

References 14 publications

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“…To calculate the relative incoming wind speed, W at each position r along the length of the blade and for each total wind speed U tot , the axial flow induction factor a and tangential flow induction factor a' need to be calculated first. Typically, this is done via an iterative numerical procedure, with the basic steps as follows [2,57,58]: a.…”

Section: Appendix A2 the Calculation Of Relative Inflow Wind Velocitymentioning

confidence: 99%

Analyses of the Extensible Blade in Improving Wind Energy Production at Sites with Low-Class Wind Resource

2017

Energies

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This paper describes the feasibility analysis of an innovative, extensible blade technology. The blade aims to significantly improve the energy production of a wind turbine, particularly at locations with unfavorable wind conditions. The innovative 'smart' blade will be extended at low wind speed to harvest more wind energy; on the other hand, it will be retracted to its original shape when the wind speed is above the rated wind speed to protect the blade from damages by high wind loads. An established aerodynamic model is implemented in this paper to evaluate and compare the power output of extensible blades versus a baseline conventional blade. The model was first validated with a monitored power production curve based on the wind energy production data of a conventional turbine blade, which is subsequently used to estimate the power production curve of extended blades. The load-on-blade structures are incorporated as the mechanical criteria to design the extension strategies. Wind speed monitoring data at three different onshore and offshore sites around Lake Erie are used to predict the annual wind energy output with different blades. The effects of extension on the dynamic characteristics of blade are analyzed. The results show that the extensive blade significantly increases the annual wind energy production (up to 20% to 30%) with different blade extension strategies. It, therefore, has the potential to significantly boost wind energy production for utility-scale wind turbines located at sites with low-class wind resource.Energies 2017, 10, 1295 2 of 24 away from cities [6,7]. However, more and more wind turbines named 'distributed energy resources' are installed at locations with lower-class wind resources [8-10] to take advantages of their close proximity to the existing electrical grid or manufacturing infrastructures. It helps to reduce the development and transportation cost, which offsets to a certain extent the disadvantages of the low-quality wind resource. In contrast to wind farms, which typically contain hundreds of wind turbines, distributed generators are mostly small-scale power generators located close to the service loads. There are a significant number of wind turbines built as distributed energy resources. According to the U.S. Department of Energy's Distributed Wind Turbine Market Report, 934 MW of distributed wind capacity was installed between 2013 and 2015, representing nearly 75,000 units across 36 states, Puerto Rico, and the U.S. Virgin Islands. Effective utilizing wind resources at sites with low and medium wind speed helps to make wind energy production to be more geographically dispersed; this also helps to reduce the inherent variabilities of wind energy production [11,12].Improving the energy production at sites with low-class wind bears an important practice value. One potential method is to increase the wind turbine hub height [4,[13][14][15][16], which utilizes the benefit that the near-ground wind speed increases with elevation. There are, however, significant cost factors...

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Section: Appendix A2 the Calculation Of Relative Inflow Wind Velocitymentioning

confidence: 99%

Analyses of the Extensible Blade in Improving Wind Energy Production at Sites with Low-Class Wind Resource

2017

Energies

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“…This has led to the popularity of semi-empirical and computational fluid dynamics (CFD) methods, which are less costly, and provide predictive data prior to blade construction. Semiempirical correlations such as BEM theory have been applied widely [4][5][6]. These methods utilize predetermined airfoil data as inputs and are typically used to model three dimensional (3D) effects of the flow.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of RANS-based turbulence models for an upscale wind turbine blade

2019

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Computational fluid dynamic (CFD) numerical simulations are providing alternative to experimental methods in preliminary analysis of aerodynamic behavior for large wind turbines. Shortcomings inherent by experimental methods have popularized the three dimensional CFD methods. This paper, therefore, presents a numerical analysis for NREL 5MW wind turbine rotor using a single moving reference frame approach. ANSYS Fluent is employed to model airflow over the blade's surfaces using Reynolds average Navier-Stokes equations. A steady-state incompressible pressure based solver is applied in form of absolute velocity formulation. Four turbulence models are used: k − SST, k − RNG, k − realizable and Spalart Allmaras to determine the aerodynamic torque. Mesh independence study and validation is also performed. In addition, the predicted flap-wise bending load and comparison of pressure distribution for the four turbulence models are evaluated at different sections of the blade. Due to absence of experimental data for employed blade model, the obtained aerodynamic torque was compared with other reliable numerical simulation results.

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“…Since the combined Blade Element Momentum Theory (BEMT) is a fairly accurate analytical tool and has low computational cost, it is widely used in the wind energy industry to estimate the theoretical output power from a rotor with defined blade dimensions [5][6][7][8][9]. A numerical code is developed in this paper based on the BEMT and validated by comparison with the experimental results of the NREL phase VI test turbine [10,11], which is a stall-controlled wind turbine.…”

Section: Introductionmentioning

confidence: 99%

A Simplified Morphing Blade for Horizontal Axis Wind Turbines

Caro¹,

Bennis²,

Mejia

2013

Journal of Solar Energy Engineering

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International audienceThe aim of designing wind turbine blades is to improve the power capture ability. Since rotor control technology is currently limited to controlling rotational speed and blade pitch, an increasing concern has been given to morphing blades. In this paper, a simplified morphing blade is introduced, which has a linear twist distribution along the span and a shape that can be controlled by adjusting the twist of the blade's root and tip. To evaluate the performance of wind turbine blades, a numerical code based on the blade element momentum theory is developed and validated. The blade of the NREL Phase VI wind turbine is taken as a reference blade and has a fixed pitch. The optimization problems associated with the control of the morphing blade and a blade with pitch control are formulated. The optimal results show that the morphing blade gives better results than the blade with pitch control in terms of produced power. Under the assumption that at a given site, the annual average wind speed is known and the wind speed follows a Rayleigh distribution, the annual energy production of wind turbines was evaluated for three types of blade, namely, morphing blade, blade with pitch control and fixed pitch blade. For an annual average wind speed varying between 5~m/s and 15~m/s, it turns out that the annual energy production of the wind turbine containing morphing blades is 24.5~\% to 69.7~\% higher than the annual energy production of the wind turbine containing pitch fixed blades. Likewise, the annual energy production of the wind turbine containing blades with pitch control is 22.7~\% to 66.9~\% higher than the annual energy production of the wind turbine containing pitch fixed blades

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Investigation of blade performance of horizontal axis wind turbine based on blade element momentum theory (BEMT) using NACA airfoils

Cited by 16 publications

References 14 publications

Analyses of the Extensible Blade in Improving Wind Energy Production at Sites with Low-Class Wind Resource

Analyses of the Extensible Blade in Improving Wind Energy Production at Sites with Low-Class Wind Resource

A comparative study of RANS-based turbulence models for an upscale wind turbine blade

A Simplified Morphing Blade for Horizontal Axis Wind Turbines

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