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Net Power Coefficient of Vertical and Horizontal Wind Turbines with Crossflow Runners

Author

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  • Toni Pujol

    (Department of Mechanical Engineering and Industrial Construction, University of Girona, c/Universitat de Girona 4, 17003 Girona, Spain)

  • Albert Massaguer

    (Department of Mechanical Engineering and Industrial Construction, University of Girona, c/Universitat de Girona 4, 17003 Girona, Spain)

  • Eduard Massaguer

    (Nabla Thermoelectrics, c/Llibertat 71, 17820 Banyoles, Spain)

  • Lino Montoro

    (Department of Mechanical Engineering and Industrial Construction, University of Girona, c/Universitat de Girona 4, 17003 Girona, Spain)

  • Martí Comamala

    (Department of Mechanical Engineering and Industrial Construction, University of Girona, c/Universitat de Girona 4, 17003 Girona, Spain)

Abstract

The feasibility of using crossflow runners as single rotors in vertical-axis wind turbines (VAWT) or as blades in horizontal-axis wind turbines (HAWT) is numerically studied. A computational fluid dynamics model is validated from data obtained in a wind tunnel. Three crossflow runners with different number of blades are tested. Values of drag, lift and torque coefficients are numerically obtained at different turning velocities. Power coefficients C p for crossflow VAWT and HAWT are calculated for different tip-speed ratios ( TSR ) and runner spin ratios ( α ). Since crossflow HAWT consume electrical energy for spinning the runners, the net power coefficient is estimated. Simulations indicate that a crossflow runner as a single rotor in VAWT should have a high solidity and work at low TSR . Crossflow runners working as blades in HAWT may achieve low drag to lift ratios but the C p is penalized by the amount of energy required for spinning the runners. The optimum working condition of crossflow HAWT is located within a narrow band of low TSR and α reaching C p values < 0.2 only.

Suggested Citation

  • Toni Pujol & Albert Massaguer & Eduard Massaguer & Lino Montoro & Martí Comamala, 2018. "Net Power Coefficient of Vertical and Horizontal Wind Turbines with Crossflow Runners," Energies, MDPI, vol. 11(1), pages 1-24, January.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:1:p:110-:d:125287
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    References listed on IDEAS

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    4. Rahmatian, Mohammad Ali & Nazarian Shahrbabaki, Amin & Moeini, Seyed Peyman, 2023. "Single-objective optimization design of convergent-divergent ducts of ducted wind turbine using RSM and GA, to increase power coefficient of a small-scale horizontal axis wind turbine," Energy, Elsevier, vol. 269(C).

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