Comparison of Blade Element Method and CFD Simulations of a 10 MW Wind Turbine

Bangga, Galih

doi:10.3390/fluids3040073

Cited by 38 publications

(23 citation statements)

References 30 publications

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“…Block-structured meshes were generated separately for the blade and background, and they were combined without sacrificing the quality of the meshes by using the Chimera overlapping grid technique (Chesshire and Henshaw, 1990). A blade mesh convergence test was performed in a previous study (Bangga et al, 2017). The blade mesh is a Ctype mesh with 280 grid cells × 128 grid cells × 192 grid cells in the chord, wall-normal and span-wise directions.…”

Section: Flowermentioning

confidence: 99%

“…More detail about the set-up of the CFD simulations can be found in and Boorsma et al (2019b). For a better agreement between lifting-line and CFD simulations, the airfoil data for the lifting-line simulations were determined from 3-D CFD simulations (Bangga et al, 2017;Bangga, 2018). To vary the angle of attack seen by the blade sections, the inflow wind speed is artificially increased or decreased by maintaining the rotational speed constant at 9.02 rpm.…”

Section: Flowermentioning

confidence: 99%

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Validation and accommodation of vortex wake codes for wind turbine design load calculations

Boorsma

Wenz

Lindenburg³

et al. 2020

Wind Energ. Sci.

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Abstract. The computational effort for wind turbine design load calculations is more extreme than it is for other applications (e.g., aerospace), which necessitates the use of efficient but low-fidelity models. Traditionally the blade element momentum (BEM) method is used to resolve the rotor aerodynamic loads for this purpose, as this method is fast and robust. With the current trend of increasing rotor size, and consequently large and flexible blades, a need has risen for a more accurate prediction of rotor aerodynamics. Previous work has demonstrated large improvement potential in terms of fatigue load predictions using vortex wake models together with a manageable penalty in computational effort. The present publication has contributed towards making vortex wake models ready for application to certification load calculations. The observed reduction in flapwise blade root moment fatigue loading using vortex wake models instead of the blade element momentum (BEM) method from previous publications has been verified using computational fluid dynamics (CFD) simulations. A validation effort against a long-term field measurement campaign featuring 2.5 MW turbines has also confirmed the improved prediction of unsteady load characteristics by vortex wake models against BEM-based models in terms of fatigue loading. New light has been shed on the cause for the observed differences and several model improvements have been developed, both to reduce the computational effort of vortex wake simulations and to make BEM models more accurate. Scoping analyses for an entire fatigue load set have revealed the overall fatigue reduction may be up to 5 % for the AVATAR 10 MW rotor using a vortex wake rather than a BEM-based code.

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Section: Flowermentioning

confidence: 99%

Section: Flowermentioning

confidence: 99%

Validation and accommodation of vortex wake codes for wind turbine design load calculations

Boorsma

Wenz

Lindenburg³

et al. 2020

Wind Energ. Sci.

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show abstract

“…This method is used extensively in wind and marine energy engineering since it does not require the massive computational overhead needed for CFD analysis. Excellent agreement between CFD and BEM performance characterisations have been observed by Bangga [33] for wind turbines and Faudot [34] for tidal turbines. Unsteady BEM for tidal turbines was also found to have a similar predictive accuracy to transient CFD simulations [35].…”

Section: High-tsr Blade Modificationmentioning

confidence: 55%

Design of a Horizontal Axis Tidal Turbine for Less Energetic Current Velocity Profiles

Encarnacion

Johnstone

Ordóñez-Sánchez

2019

JMSE

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Existing installations of tidal-stream turbines are undertaken in energetic sites with flow speeds greater than 2 m/s. Sites with lower velocities will produce far less power and may not be as economically viable when using "conventional" tidal turbine designs. However, designing turbines for these less energetic conditions may improve the global viability of tidal technology. Lower hydrodynamic loads are expected, allowing for cost reduction through downsizing and using cheaper materials. This work presents a design methodology for low-solidity high tip-speed ratio turbines aimed to operate at less energetic flows with velocities less than 1.5 m/s. Turbines operating under representative real-site conditions in Mexico and the Philippines are evaluated using a quasi-unsteady blade element momentum method. Blade geometry alterations are undertaken using a scaling factor applied to chord and twist distributions. A parametric filtering and multi-objective decision model is used to select the optimum design among the generated blade variations. It was found that the low-solidity high tip-speed ratio blades lead to a slight power drop of less than 8.5% when compared to the "conventional" blade geometries. Nonetheless, an increase in rotational speed, reaching a tip-speed ratio (TSR) of 7.75, combined with huge reduction in the torque requirement of as much as 30% paves the way for reduced costs from generator downsizing and simplified power take-off mechanisms.

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“…If the axial induction factor is greater than 0.4, the Froude momentum principle is no longer accurate. Thus, Bangga [21] suggested correction of the axial induction factor, if a(r i ) j > a c , using Eq. (9).…”

Section: Fig 2 Illustration Of the Design Steps For Sizing Of Windmill Rotor For Water-pumping Systemmentioning

confidence: 99%

Determining Optimum Rotary Blade Design for Wind-Powered Water-Pumping Systems for Local Selected Sites

Mohammed

Lemu

Sirahbizu

2021

SV-JME

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The design of a windmill rotor is critical for harnessing wind energy. In this work, a study is conducted to optimize the design and performance of a rotor blade that is suitable for low wind conditions. The windmills’ rotor blades are aerodynamically designed based on the SG6043 airfoil and wind speed data at local selected sites. The aerodynamic profile of the rotor blade that can provide a maximum power coefficient, which is the relation between real rotor performance and the available wind energy on a given reference area, was calculated. Different parameters, such as blade shapes, chord distributions, tip speed ratio, geometries set angles, etc., were used to optimize the blade design with the objective of extracting maximum wind power for a water pumping system. Windmill rotor of 10.74 m, 7.34 m, and 6.34 m diameter with three blades were obtained for the selected sites at Abomsa, Metehara, and Ziway in south-east Ethiopia. During the rotary blades performance optimization, blade element momentum (BEM) theory and solving iteration by MATLAB® coding were used.

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Comparison of Blade Element Method and CFD Simulations of a 10 MW Wind Turbine

Cited by 38 publications

References 30 publications

Validation and accommodation of vortex wake codes for wind turbine design load calculations

Validation and accommodation of vortex wake codes for wind turbine design load calculations

Design of a Horizontal Axis Tidal Turbine for Less Energetic Current Velocity Profiles

Determining Optimum Rotary Blade Design for Wind-Powered Water-Pumping Systems for Local Selected Sites

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