An experimental evaluation of the interplay between geometry and scale on cross-flow turbine performance Article Swipe

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Aidan Hunt , Benjamin Strom , Gregory Talpey , Hannah Ross , Isabel Scherl , Steven L. Brunton , Martin Wosnik , Brian Polagye ·

YOU? · · 2023 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2310.20616

Cross-flow turbines harness kinetic energy in wind or moving water. Due to their unsteady fluid dynamics, it can be difficult to predict the interplay between aspects of rotor geometry and turbine performance. This study considers the effects of three geometric parameters: the number of blades, the preset pitch angle, and the chord-to-radius ratio. The relevant fluid dynamics of cross-flow turbines are reviewed, as are prior experimental studies that have investigated these parameters in a more limited manner. Here, 223 unique experiments are conducted across an order of magnitude of diameter-based Reynolds numbers ($\approx 8\!\times\!10^4 - 8\!\times\!10^5$) in which the performance implications of these three geometric parameters are evaluated. In agreement with prior work, maximum performance is generally observed to increase with Reynolds number and decrease with blade count. The broader experimental space clarifies parametric interdependencies; for example, the optimal preset pitch angle is increasingly negative as the chord-to-radius ratio increases. As these experiments vary both the chord-to-radius ratio and blade count, the performance of different rotor geometries with the same solidity (the ratio of total blade chord to rotor circumference) can also be evaluated. Results demonstrate that while solidity can be a poor predictor of maximum performance, across all scales and tested geometries it is an excellent predictor of the tip-speed ratio corresponding to maximum performance. Overall, these results present a uniquely holistic view of relevant geometric considerations for cross-flow turbine rotor design and provide a rich dataset for validation of numerical simulations and reduced-order models.

Related Topics

Reynolds Number

Turbine

Rotor (Electric)

Aspect Ratio (Aeronautics)

Turbine Blade

Geometry

Computational Fluid Dynamics

Mechanical Engineering

Optoelectronics

Programming Language

Computer Security

Concepts

Solidity Chord (peer-to-peer) Reynolds number Turbine Rotor (electric) Tip-speed ratio Aspect ratio (aeronautics) Mechanics Turbine blade RADIUS Geometry Computational fluid dynamics Mathematics Physics Aerodynamics Turbulence Engineering Computer science Mechanical engineering Distributed computing Optoelectronics Programming language Computer security

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2310.20616
PDF: https://arxiv.org/pdf/2310.20616
OA Status: green
Cited By: 1
References: 87
Related Works: 10
OpenAlex ID: https://openalex.org/W4388184963

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OpenAlex ID: https://openalex.org/W4388184963

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DOI: https://doi.org/10.48550/arxiv.2310.20616

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Title: An experimental evaluation of the interplay between geometry and scale on cross-flow turbine performance

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Type: preprint

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Language: en

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Publication year: 2023

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Publication date: 2023-10-31

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Authors: Aidan Hunt, Benjamin Strom, Gregory Talpey, Hannah Ross, Isabel Scherl, Steven L. Brunton, Martin Wosnik, Brian Polagye

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Landing page: https://arxiv.org/abs/2310.20616

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PDF URL: https://arxiv.org/pdf/2310.20616

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OA status: green

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Concepts: Solidity, Chord (peer-to-peer), Reynolds number, Turbine, Rotor (electric), Tip-speed ratio, Aspect ratio (aeronautics), Mechanics, Turbine blade, RADIUS, Geometry, Computational fluid dynamics, Mathematics, Physics, Aerodynamics, Turbulence, Engineering, Computer science, Mechanical engineering, Distributed computing, Optoelectronics, Programming language, Computer security

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Cited by: 1

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Citations by year (recent): 2025: 1

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