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- Title
On the aerodynamics of dual-stage co-axial vertical-axis wind turbines.
- Authors
Khalid, Muhammad Saif Ullah; Portocarrero Mendoza, Priscila Scarlet; Wood, David; Hemmati, Arman
- Abstract
This study explored the aerodynamics of a new multi-stage co-axial vertical-axis wind turbine based on bio-inspiration from natural swimming habit of fish. The turbine was formed from a conventional straight-bladed vertical axis turbine (VAWT) with an additional small inner rotor, also of three blades. The azimuthal and radial locations of the inner rotor were varied. Using numerical simulations, performance of the proposed new design was evaluated over a range of tip-speed ratios. The preliminary results identified a 600% increase in power output for multi-stage VAWTs at tip-speed ratios TSR < 3 , and a substantial drop in power coefficient at TSR > 3. 0. The wake dynamics analyses revealed that the increase was due to interactions between the blades of one rotor and the other. This reduced the unsteady separation from the outer rotor, which produced most of the power. A detailed parametric study was also completed, which showed the implications of geometric and kinematic details on the performance of the proposed multistage VAWT.
- Subjects
VERTICAL axis wind turbines; WIND turbines; AERODYNAMICS; COMPUTATIONAL fluid dynamics; BIONICS
- Publication
Wind Engineering, 2024, Vol 48, Issue 3, p408
- ISSN
0309-524X
- Publication type
Article
- DOI
10.1177/0309524X231212638