A Study of the Near Wake Deformation of the X‐Rotor Vertical‐Axis Wind Turbine With Pitched Blades

ABSTRACT Recent studies have revealed the large potential of vertical‐axis wind turbines (VAWTs) for high‐energy‐density wind farms due to their favorable wake recovery characteristics. The present study provides an experimental demonstration and proof‐of‐concept for the wake recovery mechanism of t...

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Bibliographic Details
Published in:Wind energy (Chichester, England) England), 2024-11, Vol.27 (11), p.1388-1411
Main Authors: Bensason, David, Sciacchitano, Andrea, Giri Ajay, Adhyanth, Simao Ferreira, Carlos
Format: Article
Language:English
Subjects:
Aerodynamics
Blades
Load fluctuation
Particle image velocimetry
Quadrants
Recovery
Rotors
Turbines
Unsteady flow
Vertical axis wind turbines
vertical‐axis wind turbine
Vortices
wake re‐energization
Wind farms
Wind power
X‐Rotor
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Summary:ABSTRACT Recent studies have revealed the large potential of vertical‐axis wind turbines (VAWTs) for high‐energy‐density wind farms due to their favorable wake recovery characteristics. The present study provides an experimental demonstration and proof‐of‐concept for the wake recovery mechanism of the novel X‐Rotor VAWT. The phase‐locked flowfield is measured at several streamwise locations along the X‐Rotor's wake using stereoscopic particle image velocimetry (PIV) with fixed‐pitch offsets applied to the blades. The streamwise vortex system of the upper half of the X‐Rotor is first hypothesized and then experimentally verified. The induced wake deformations of the vortex systems are discussed in comparison with previous studies concerning traditional H‐type VAWTs. The results suggest that positive blade pitch is more favorable for accelerated wake recovery due to the dominant tip‐vortex generated on the upwind windward quadrant of the cycle. Utilizing theoretical blade load variations along the span explains distinct unsteady flow features in the near wake generated at select quadrants of the rotor rotation, shedding light on the potential of the two pitch schemes.
ISSN:1095-4244
1099-1824
DOI:10.1002/we.2944