A Theoretical and Experimental Comparison of Optimizing Angle of Twist Using BET and BEMT

Burdett, Timothy A.; Treuren, Kenneth W. Van

doi:10.1115/gt2012-68350

Cited by 8 publications

(6 citation statements)

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“…BEMT design methods as well as demonstrate geometric and Reynolds number scaling 12 JERT-14-1403, Van Treuren [18,19]. Other tests can be conducted on tip speed ratio (TSR), number of blades, optimization of twist, effects of roughness, etc., such as was studied by Gregg and Van Treuren [54,55].…”

Section: Wind Turbine Systems Testing In a Wind Tunnelmentioning

confidence: 99%

Small-Scale Wind Turbine Testing in Wind Tunnels Under Low Reynolds Number Conditions

Treuren

2015

Journal of Energy Resources Technology

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Much of the aerodynamic design of wind turbines isaccomplished using computational tools such as XFOIL. These codes are not robust enough for predicting performance under the low Reynolds numbers found with small-scale wind turbines. Wind tunnels can experimentally test wind turbine airfoils to determine lift and drag data over typical operating Reynolds numbers. They can also test complete small wind turbine systems to determine overall performance. For small-scale wind turbines, quality experimental airfoil data at the appropriate Reynolds numbers are necessary for accurate design and prediction of power production. A c c e p t e d M a n u s c r i p t N o t C o p y e d i t e dDownloaded From: http://energyresources.asmedigitalcollection.asme.org/ on 05/23/2015 Terms of Use: http://asme.org/terms

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Section: Wind Turbine Systems Testing In a Wind Tunnelmentioning

confidence: 99%

Small-Scale Wind Turbine Testing in Wind Tunnels Under Low Reynolds Number Conditions

Treuren

2015

Journal of Energy Resources Technology

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“…Data were collected using the NI PCle-6323 DAQ card (National Instruments, Austin, TX, USA) and data acquisition software. Regarding testing methodology, several studies suggest matching Reynolds number, tip-speed ratio, and geometric scaling when down-scaling small-scale wind turbine models for wind tunnel testing [26,[28][29][30][31]. However, this led to impractical conditions due to high wind speeds causing vibrations in the supporting structure and high noise levels.…”

Section: Experimental Setup and Validationmentioning

confidence: 99%

An Experimental Study on the Effectiveness of the Backward-Facing Step Technique on Small-Scale Horizontal-Axis Wind Turbine Rotor Blades

Morina,

Akansu

2024

Energies

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The aim of this research work was to explore how modifying the design of small-scale HAWT rotor blades through the backward-facing step technique affects their efficiency under varying wind speeds. The study involved altering step parameters such as location, length, and depth to create four distinct stepped blade shapes and enhance the aerodynamic performance of a rotor with a diameter of 280 mm. A specific blade profile, NREL S822, was selected to meet both aerodynamic and structural criteria. The rotor models were examined at a Reynolds number of 4.7 × 104 for wind speeds between 8.5 and 15.5 m/s and tip-speed ratios between 2 and 5. The experimental results indicated that for certain geometric step parameter values, the efficiency of the rotor model (B3) increased by approximately 47% compared to the base model (B1), particularly for tip-speed ratios lower than around 3.2. However, beyond this point, the rotor efficiency dropped significantly, reaching approximately 60% in one case. Additionally, a hybrid rotor model (B6) was generated by combining the shape of the rotor model (B4) with the most efficient rotor model from the literature, generated using the leading-edge wavy shape technique. This hybrid rotor model enhanced rotor efficiency for specific values of tip-speed ratio and also ensured its smoother operation. Overall, the rotor model (B2), distinguished by smaller step parameter values and a shift as well as broadening of the power coefficient curve towards lower tip-speed ratio values, exhibited a higher peak power coefficient, approximately 1.4% greater than the base rotor (B1). This increase occurred at a lower tip-speed ratio, allowing the rotor to operate with higher efficiency across a broader range of tip-speed ratios.

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“…An important amount of research has been focused on obtaining an optimum maximum power coefficient for a given working condition. For instance, Burdett and VanTeuren [33] found an optimized solution for a given tip speed ratio assuming that the Reynolds number can affect the 2D airfoil characteristics. It was shown that this influence was practically inappreciable.…”

Section: Design Of Experimentsmentioning

confidence: 99%

Enhanced design methodology of a low power stall regulated wind turbine. BEMT and MRF-RANS combination and comparison with existing designs

Torregrosa

Gil

Quintero

et al. 2019

Journal of Wind Engineering and Industrial Aerodynamics

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Wind energy importance has increased over the past decades. Energy generation by small turbines installed near urban locations has experienced noticeable growth. This work is focused on the development of a design methodology for a low power blade well suited for all the wind operation conditions.First, a complete Design of Experiments will be presented using the low computational cost tool Blade Element Momentum Theory (BEMT) in order to discard those designs which are clearly not suited to the requirements of the system. Later, the remaining were analyzed using a Computational Fluid Dynamics (CFD) methodology in order to account for three dimensional effects. The value of the left slope of the non-dimensional power curve has been found to be a key parameter for the design.This methodology has been validated with experimental results available from NREL Phase VI wind turbine, allowing to conclude that BEMT is capable to provide with pre-design accurate results which, nevertheless, should corrected by CFD.The results of the proposed design are analyzed and compared to the CFD predictions of a commercial existing blade designed to comply with similar working. For the proposed design, predictions indicate better behavior in terms of maximum power and controllability.

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A Theoretical and Experimental Comparison of Optimizing Angle of Twist Using BET and BEMT

Cited by 8 publications

References 0 publications

Small-Scale Wind Turbine Testing in Wind Tunnels Under Low Reynolds Number Conditions

Small-Scale Wind Turbine Testing in Wind Tunnels Under Low Reynolds Number Conditions

An Experimental Study on the Effectiveness of the Backward-Facing Step Technique on Small-Scale Horizontal-Axis Wind Turbine Rotor Blades

Enhanced design methodology of a low power stall regulated wind turbine. BEMT and MRF-RANS combination and comparison with existing designs

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