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

Toni Pujol, Albert Massaguer, Eduard Massaguer, Lino Montoro and Martí Comamala
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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

Energies, 2018, vol. 11, issue 1, 1-24

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 ( ? ). 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 ? reaching C p values < 0.2 only.

Keywords: crossflow runner; crossflow turbine; Magnus turbine; HAWT; VAWT (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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