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Rotor Design for Diffuser Augmented Wind Turbines

Author

Listed:
  • Søren Hjort

    (Volu Ventis ApS, Ferskvandscentret, 8600 Silkeborg, Denmark)

  • Helgi Larsen

    (Volu Ventis ApS, Ferskvandscentret, 8600 Silkeborg, Denmark)

Abstract

Diffuser augmented wind turbines (DAWTs) can increase mass flow through the rotor substantially, but have often failed to fulfill expectations. We address high-performance diffusers, and investigate the design requirements for a DAWT rotor to efficiently convert the available energy to shaft energy. Several factors can induce wake stall scenarios causing significant energy loss. The causality between these stall mechanisms and earlier DAWT failures is discussed. First, a swirled actuator disk CFD code is validated through comparison with results from a far wake swirl corrected blade-element momentum (BEM) model, and horizontal-axis wind turbine (HAWT) reference results. Then, power efficiency versus thrust is computed with the swirled actuator disk (AD) code for low and high values of tip-speed ratios (TSR), for different centerbodies, and for different spanwise rotor thrust loading distributions. Three different configurations are studied: The bare propeller HAWT, the classical DAWT, and the high-performance multi-element DAWT. In total nearly 400 high-resolution AD runs are generated. These results are presented and discussed. It is concluded that dedicated DAWT rotors can successfully convert the available energy to shaft energy, provided the identified design requirements for swirl and axial loading distributions are satisfied.

Suggested Citation

  • Søren Hjort & Helgi Larsen, 2015. "Rotor Design for Diffuser Augmented Wind Turbines," Energies, MDPI, vol. 8(10), pages 1-39, September.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:10:p:10736-10774:d:56501
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    References listed on IDEAS

    as
    1. Igra, Ozer, 1977. "The shrouded aerogenerator," Energy, Elsevier, vol. 2(4), pages 429-439.
    2. 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.
    3. Søren Hjort & Helgi Larsen, 2014. "A Multi-Element Diffuser Augmented Wind Turbine," Energies, MDPI, vol. 7(5), pages 1-26, May.
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    Cited by:

    1. Rezek, Thiago J. & Camacho, Ramiro G.R. & Manzanares-Filho, Nelson, 2023. "A novel methodology for the design of diffuser-augmented hydrokinetic rotors," Renewable Energy, Elsevier, vol. 210(C), pages 524-539.
    2. Keramat Siavash, Nemat & Najafi, G. & Tavakkoli Hashjin, Teymour & Ghobadian, Barat & Mahmoodi, Esmail, 2020. "Mathematical modeling of a horizontal axis shrouded wind turbine," Renewable Energy, Elsevier, vol. 146(C), pages 856-866.
    3. Sorribes-Palmer, F. & Sanz-Andres, A. & Ayuso, L. & Sant, R. & Franchini, S., 2017. "Mixed CFD-1D wind turbine diffuser design optimization," Renewable Energy, Elsevier, vol. 105(C), pages 386-399.
    4. Søren Hjort, 2019. "Non-Empirical BEM Corrections Relating to Angular and Axial Momentum Conservation," Energies, MDPI, vol. 12(2), pages 1-28, January.

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