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Improvement of self-starting capabilities of vertical axis wind turbines with new design of turbine blades
- Source :
- Sustainability, Vol 13, Iss 3854, p 3854 (2021), Sustainability, Volume 13, Issue 7
- Publication Year :
- 2021
- Publisher :
- MDPI, 2021.
-
Abstract
- A lift-driven vertical axis wind turbine (VAWT) generates peak power when it is rotating at high tip-speed ratios (TSR), at which time the blades encounter angles of attack (AOA) over a small range from zero to 30 degrees. However, its ability to self-start is dependent upon its performance at low TSRs, at which time the blades encounter a range of AOAs from zero to 180 degrees. A novel vented aerofoil is presented with the intention of improving the performance of a lift-driven VAWT at low TSRs without hampering the performance of the wind turbine at high TSRs. Computational fluid dynamics (CFD) simulation is used to predict the aerodynamic characteristics of a new vented aerofoil based on the well documented NACA0012 profile. Simulations are performed using the SST turbulence model. The results obtained show a reduction in the coefficient of tangential force (the force that generates torque on the wind turbine) at low AOAs (less than 90 degrees) of no more than 30%, while at high AOAs (more than 90 degrees) an improvement in the tangential force of over 100% is observed. Using a simple momentum based performance prediction model, these results suggest that this would lead to an increase in torque generation by a theoretical three-bladed VAWT of up to 20% at low TSRs and a minor reduction in coefficient of performance of up to 9% at TSR of 2 and closer to 1% at higher TSRs.
- Subjects :
- Airfoil
Vertical axis wind turbine
Turbine blade
020209 energy
Geography, Planning and Development
lcsh:TJ807-830
lcsh:Renewable energy sources
02 engineering and technology
010501 environmental sciences
Management, Monitoring, Policy and Law
01 natural sciences
Turbine
law.invention
lift
wind turbine
law
0202 electrical engineering, electronic engineering, information engineering
Performance prediction
mechanical
lcsh:Environmental sciences
0105 earth and related environmental sciences
Physics
lcsh:GE1-350
Wind power
self-start
Renewable Energy, Sustainability and the Environment
business.industry
lcsh:Environmental effects of industries and plants
Aerodynamics
Mechanics
renewable energy
Lift (force)
lcsh:TD194-195
aerofoil
business
drag
Subjects
Details
- Language :
- English
- ISSN :
- 20711050
- Database :
- OpenAIRE
- Journal :
- Sustainability, Vol 13, Iss 3854, p 3854 (2021), Sustainability, Volume 13, Issue 7
- Accession number :
- edsair.doi.dedup.....b45d1af61fc363b08cd70f3a8dc58955