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Numerical Study of the Effect of Flap Geometry in a Multi-Slot Ducted Wind Turbine

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  • Antonio García Auyanet

    (School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK)

  • Patrick G. Verdin

    (School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK)

Abstract

One possible way to harness wind more efficiently in low-wind urban areas is to place wind turbines inside a duct. A known issue of such approach is due to the flow separation that can occur at the diffuser walls. This can be avoided using a channelled structure consisting of a duct and a flap, also known as a multi-slot system. The present work describes the effects of a flap geometry on the turbine performance, through computational fluid dynamics (CFD). Four flaps based on airfoils, with different thicknesses and cambers, were evaluated. It was found that thinner and more cambered flaps produce higher wind turbine performance, showing power augmentations up to 2.5 compared to a bare turbine. A comparison between the multi-slot design and a single-piece duct of the same geometry was also performed, showing that the multi-slot design is more efficient if the flow is maintained attached to the flap.

Suggested Citation

  • Antonio García Auyanet & Patrick G. Verdin, 2022. "Numerical Study of the Effect of Flap Geometry in a Multi-Slot Ducted Wind Turbine," Sustainability, MDPI, vol. 14(19), pages 1-17, September.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:19:p:12032-:d:923017
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    References listed on IDEAS

    as
    1. Nunes, Matheus M. & Brasil Junior, Antonio C.P. & Oliveira, Taygoara F., 2020. "Systematic review of diffuser-augmented horizontal-axis turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 133(C).
    2. Fei-Bin Hsiao & Chi-Jeng Bai & Wen-Tong Chong, 2013. "The Performance Test of Three Different Horizontal Axis Wind Turbine (HAWT) Blade Shapes Using Experimental and Numerical Methods," Energies, MDPI, vol. 6(6), pages 1-20, June.
    3. Igra, Ozer, 1977. "The shrouded aerogenerator," Energy, Elsevier, vol. 2(4), pages 429-439.
    4. Khamlaj, Tariq Abdulsalam & Rumpfkeil, Markus Peer, 2018. "Analysis and optimization of ducted wind turbines," Energy, Elsevier, vol. 162(C), pages 1234-1252.
    5. Yuji Ohya & Takashi Karasudani, 2010. "A Shrouded Wind Turbine Generating High Output Power with Wind-lens Technology," Energies, MDPI, vol. 3(4), pages 1-16, March.
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    Cited by:

    1. Antonio García Auyanet & Rangga E. Santoso & Hrishikesh Mohan & Sanvay S. Rathore & Debapriya Chakraborty & Patrick G. Verdin, 2022. "CFD-Based J-Shaped Blade Design Improvement for Vertical Axis Wind Turbines," Sustainability, MDPI, vol. 14(22), pages 1-16, November.
    2. Farzadi, Ramin & Bazargan, Majid, 2023. "3D numerical simulation of the Darrieus vertical axis wind turbine with J-type and straight blades under various operating conditions including self-starting mode," Energy, Elsevier, vol. 278(PB).

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