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A Multi-Element Diffuser Augmented Wind Turbine

Author

Listed:
  • Søren Hjort

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

  • Helgi Larsen

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

Abstract

A new class of diffuser augmented wind turbines (DAWTs) is presented. The new diffuser concept exploits aero-dynamic principles for the creation of high-lift airfoil configurations known from the aircraft industry. Combining this with our objective of obtaining a compact power-efficient design has enabled creation of a family of DAWT designs with energy capture potentials which exceed the power efficiency based on the diffuser exit area by 50%. The paper presents the 1D momentum theory governing the DAWTs, and discusses upper limits for power extraction, similar to the Betz limit applicable for bare Horizontal-Axis Wind Turbines (HAWTs). Inviscid axisymmetric panel code calculations are then used to drive the diffuser design towards higher power coefficients. Axisymmetric actuator disk Navier-Stokes calculations reveal the types of stall that inhibit the functionality of the ideal inviscid optimum, leading the design towards the new class of DAWTs. DAWT performance has been differently measured over time, creating confusion. Proper comparison with performance of existing DAWT designs is therefore emphasized. This involves reference to established literature results, and recalculation of earlier DAWT designs in an attempt to project all results onto a common metric.

Suggested Citation

  • Søren Hjort & Helgi Larsen, 2014. "A Multi-Element Diffuser Augmented Wind Turbine," Energies, MDPI, vol. 7(5), pages 1-26, May.
    • Handle: RePEc:gam:jeners:v:7:y:2014:i:5:p:3256-3281:d:36217
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    References listed on IDEAS

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    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.
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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. Anbarsooz, M. & Amiri, M., 2022. "Towards enhancing the wind energy potential at the built environment: Geometry effects of two adjacent buildings," Energy, Elsevier, vol. 239(PD).
    4. Søren Hjort & Helgi Larsen, 2015. "Rotor Design for Diffuser Augmented Wind Turbines," Energies, MDPI, vol. 8(10), pages 1-39, September.
    5. Mauro, S. & Brusca, S. & Lanzafame, R. & Messina, M., 2019. "CFD modeling of a ducted Savonius wind turbine for the evaluation of the blockage effects on rotor performance," Renewable Energy, Elsevier, vol. 141(C), pages 28-39.
    6. 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.
    7. Avallone, Francesco & Ragni, Daniele & Casalino, Damiano, 2020. "On the effect of the tip-clearance ratio on the aeroacoustics of a diffuser-augmented wind turbine," Renewable Energy, Elsevier, vol. 152(C), pages 1317-1327.
    8. Søren Hjort, 2019. "Non-Empirical BEM Corrections Relating to Angular and Axial Momentum Conservation," Energies, MDPI, vol. 12(2), pages 1-28, January.
    9. Bontempo, R. & Manna, M., 2020. "Diffuser augmented wind turbines: Review and assessment of theoretical models," Applied Energy, Elsevier, vol. 280(C).

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