Open Access
Aerodynamic interference between two Darrieus wind turbines
P.R. Schatzle,Paul C. Klimas,H.R. Spahr +2 more
- Vol. 80, pp 25897
TLDR
In this article, the effect of aerodynamic interference on the performance of two curved bladed Darrieus-type vertical axis wind turbines has been calculated using a vortex/lifting line aerodynamic model.Abstract:
The effect of aerodynamic interference on the performance of two curved bladed Darrieus-type vertical axis wind turbines has been calculated using a vortex/lifting line aerodynamic model. The turbines have a tower-to-tower separation distance of 1.5 turbine diameters, with the line of turbine centers varying with respect to the ambient wind direction. The effects of freestream turbulence were neglected. For the cases examined, the calculations showed that the downwind turbine power decrement (1) was significant only when the line of turbine centers was coincident with the ambient wind direction, (2) increased with increasing tipspeed ratio, and (3) is due more to induced flow angularities downstream than to speed deficits near the downstream turbine.read more
Citations
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Potential order-of-magnitude enhancement of wind farm power density via counter-rotating vertical-axis wind turbine arrays
TL;DR: In this article, the authors investigated the use of counter-rotating vertical-axis wind turbines (VAWTs) in order to achieve higher power output per unit land area than existing wind farms consisting of HAWTs.
Journal ArticleDOI
Modelling the aerodynamics of vertical-axis wind turbines in unsteady wind conditions
Frank Scheurich,Richard E. Brown +1 more
TL;DR: In this article, the Vorticity Transport Model has been used to investigate the aerodynamic performance and wake dynamics, both in steady and unsteady wind conditions, of three different vertical-axis wind turbines.
Journal ArticleDOI
CFD Investigation on the Aerodynamic Interferences between Medium-solidity Darrieus Vertical Axis Wind Turbines
TL;DR: In this article, a campaign of CFD simulations has been performed to analyse the aerodynamic interferences in two-rotor configurations, showing an increase of power production of about 10% compared to results for the isolated turbine, independently of the sense of rotation.
Journal ArticleDOI
Experimental validation of the power enhancement of a pair of vertical-axis wind turbines
Antoine Vergaerde,Tim De Troyer,Lieven Standaert,Joanna Kluczewska-Bordier,Denis Pitance,Alexandre Immas,Frederic Silvert,Mark Runacres +7 more
TL;DR: In this paper, wind tunnel tests have been performed of individual and paired H-type Darrieus vertical-axis wind turbines, and the authors found average relative increases in the power coefficients between 13% and 16%, which is consistent with numerical studies available in the literature.
Journal ArticleDOI
Electric power from vertical-axis wind turbines
TL;DR: In this article, the authors defined interference factor a, downstream interference factor av = upstream interference factor A = actuator disk area & = blade aspect ratio C = blade chord CD = drag coefficient CL = lift coefficient Cn = sine response coefficient Cp = power coefficient based on wind speed CPm = maximum power coefficient on wind speeds CR = chord-to-radius ratio [C] = Coriolis matrix Dn = cosine response coefficients F = streamwise force on actuator disks Fa = vibratory aerodynamic forces Fa = steady aerodynamic force Fg = gravitational forces
References
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A Vortex Model of the Darrieus Turbine: An Analytical and Experimental Study
TL;DR: A preliminary aerodynamic performance prediction model has been constructed for the Darrieus turbine using a vortex lattice method of analysis and a series of experiments were conducted for the express purpose of validating the analytical model.