Loss of efficiency in a coaxial arrangement of a pair of wind rotors
V.L. Okulov1, 2, I.V. Naumov1, M.A. Tsoy1, and R.F. Mikkelsen2
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Denmark Technical University, Lyngby, Denmark
E-mail: vaok@dtu.dk
Keywords: wind farm, rotor wake, interaction between turbines and wakes, power loss of wind turbines
Pages: 545–551
Abstract
The efficiency of a pair
of wind turbines is experimentally investigated for the case when the model of
the second rotor is coaxially located in the wake of the first one. This
configuration implies the maximum level of losses in wind farms, as in the
rotor wakes, the deceleration of the freestream is maximum. As a result of
strain gauge measurements, the dependences of dimensionless power
characteristics of both rotors on the distances between them were determined
for different modes at different tip speed ratios. The obtained results are of interest
for further development of aerodynamics of wind turbines, for optimizing the
work of existing wind farms and reducing their power losses due to interactions
with wakes of other wind turbines during design and calculation.
DOI: 10.1134/S0869864317040059
|
