Effect of Blade Number on a Straight-Bladed Vertical-Axis Darreius Wind Turbine
This paper presents a mean for reducing the torque
variation during the revolution of a vertical-axis wind turbine
(VAWT) by increasing the blade number. For this purpose, twodimensional
CDF analysis have been performed on a straight-bladed
Darreius-type rotor. After describing the computational model, a
complete campaign of simulations based on full RANS unsteady
calculations is proposed for a three, four and five-bladed rotor
architecture characterized by a NACA 0025 airfoil. For each
proposed rotor configuration, flow field characteristics are
investigated at several values of tip speed ratio, allowing a
quantification of the influence of blade number on flow geometric
features and dynamic quantities, such as rotor torque and power.
Finally, torque and power curves are compared for the analyzed
architectures, achieving a quantification of the effect of blade number
on overall rotor performance.
[1] European Wind Energy Association, EU energy policy after
2020,www.ewea.org, 2011.
[2] M. Raciti Castelli, E. Benini, Effect of blade inclination angle on a
Darreius wind turbine, Journal of turbomachinery,2012.
[3] S. Li, Y. Li, Numerical study on the performance effects of solidity on
the straight-bladed vertical axes wind turbine, Power and energy
Engineering Conference, 2010.
[4] I.Paraschivoiu, "Wind turbine design with emphasis on Darrieus
concept", Polytechnic International Press, Canada,2002.
[5] M. Dunquette, K. Visser, Numerical implications of solidity and Blade
Number on Rotor Performance of horizontal-axis wind turbines, Journal
of Solar Energy Engineering, November 2003.
[6] S. Ferreira, H. Bijl, G. van Bussel ,G. van Kuik, Simulating dynamic
stall in a 2D VAWT: modeling strategy, verification and validation with
particle image velocimetry data, The Science of making torque from
wind. Journal of Physics: Conference Series 75,2007.
[7] S. Wang, Z. Tao, Numerical investigation on dynamic stall associated
with low reynolds number flows over airfoils, 2nd International
Conference on Computer Engineering and Technology,2010.
[8] R. Howell, N. Qin, J. Edwards, N. Durrani. Wind tunnel and numerical
study of a small vertical axis wind turbine, Renewable Energy 35, 2010.
[9] J. H. Strickland: The Darrieus turbine: a performance prediction model
using multiple streamtube, SAND 75e0431,1975.
[10] Fluent Inc., Fluent User-s Manual,pp. 193-194, 2006.
[11] R.M. Cummings, J.R. Forsythe, S.A. Morton, K.D. Squires,
Computational challenges in high angle of attack flow prediction, Prog
Aerospace Sci, 2003.
[12] M. Raciti Castelli, G. Pavesi, L. Battisti, E. Benini, G. Ardizzon,
Modeling strategy and numerical validation for a Darrieus vertical axis
micro-wind turbine, ASME 2010 International Mechanical Engineering
Congress & Exposition, Vancouver, British Columbia, Canada,
November 12e18 2010.
[13] M. McMullen, A. Jameson, J.J. Alonso, Acceleration of convergence to
a periodic steady state in turbomachinery flows, 39th AIAA aerospace
sciences meeting & exhibit. Reno, NV: AIAA; January 8-11 2001.
[14] M. Raciti Castelli, A. Englaro, E. Benini, The Dareius wind
turbine:Proposal for new performance prediction model based on CFD,
Energy, Volume 36, Issue 8, August 2011.
[15] G.H. Yu, X.C. Zhu, Z.H. Du, Numerical simulation of a wind turbine
airfoil: dynamic stall and comparison with experiments, Power and
Energy Journal Vol. 224, 2010.
[1] European Wind Energy Association, EU energy policy after
2020,www.ewea.org, 2011.
[2] M. Raciti Castelli, E. Benini, Effect of blade inclination angle on a
Darreius wind turbine, Journal of turbomachinery,2012.
[3] S. Li, Y. Li, Numerical study on the performance effects of solidity on
the straight-bladed vertical axes wind turbine, Power and energy
Engineering Conference, 2010.
[4] I.Paraschivoiu, "Wind turbine design with emphasis on Darrieus
concept", Polytechnic International Press, Canada,2002.
[5] M. Dunquette, K. Visser, Numerical implications of solidity and Blade
Number on Rotor Performance of horizontal-axis wind turbines, Journal
of Solar Energy Engineering, November 2003.
[6] S. Ferreira, H. Bijl, G. van Bussel ,G. van Kuik, Simulating dynamic
stall in a 2D VAWT: modeling strategy, verification and validation with
particle image velocimetry data, The Science of making torque from
wind. Journal of Physics: Conference Series 75,2007.
[7] S. Wang, Z. Tao, Numerical investigation on dynamic stall associated
with low reynolds number flows over airfoils, 2nd International
Conference on Computer Engineering and Technology,2010.
[8] R. Howell, N. Qin, J. Edwards, N. Durrani. Wind tunnel and numerical
study of a small vertical axis wind turbine, Renewable Energy 35, 2010.
[9] J. H. Strickland: The Darrieus turbine: a performance prediction model
using multiple streamtube, SAND 75e0431,1975.
[10] Fluent Inc., Fluent User-s Manual,pp. 193-194, 2006.
[11] R.M. Cummings, J.R. Forsythe, S.A. Morton, K.D. Squires,
Computational challenges in high angle of attack flow prediction, Prog
Aerospace Sci, 2003.
[12] M. Raciti Castelli, G. Pavesi, L. Battisti, E. Benini, G. Ardizzon,
Modeling strategy and numerical validation for a Darrieus vertical axis
micro-wind turbine, ASME 2010 International Mechanical Engineering
Congress & Exposition, Vancouver, British Columbia, Canada,
November 12e18 2010.
[13] M. McMullen, A. Jameson, J.J. Alonso, Acceleration of convergence to
a periodic steady state in turbomachinery flows, 39th AIAA aerospace
sciences meeting & exhibit. Reno, NV: AIAA; January 8-11 2001.
[14] M. Raciti Castelli, A. Englaro, E. Benini, The Dareius wind
turbine:Proposal for new performance prediction model based on CFD,
Energy, Volume 36, Issue 8, August 2011.
[15] G.H. Yu, X.C. Zhu, Z.H. Du, Numerical simulation of a wind turbine
airfoil: dynamic stall and comparison with experiments, Power and
Energy Journal Vol. 224, 2010.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:61846", author = "Marco Raciti Castelli and Stefano De Betta and Ernesto Benini", title = "Effect of Blade Number on a Straight-Bladed Vertical-Axis Darreius Wind Turbine", abstract = "This paper presents a mean for reducing the torque
variation during the revolution of a vertical-axis wind turbine
(VAWT) by increasing the blade number. For this purpose, twodimensional
CDF analysis have been performed on a straight-bladed
Darreius-type rotor. After describing the computational model, a
complete campaign of simulations based on full RANS unsteady
calculations is proposed for a three, four and five-bladed rotor
architecture characterized by a NACA 0025 airfoil. For each
proposed rotor configuration, flow field characteristics are
investigated at several values of tip speed ratio, allowing a
quantification of the influence of blade number on flow geometric
features and dynamic quantities, such as rotor torque and power.
Finally, torque and power curves are compared for the analyzed
architectures, achieving a quantification of the effect of blade number
on overall rotor performance.", keywords = "CFD, VAWT, NACA 0021, blade number", volume = "6", number = "1", pages = "304-7", }