The measurements have been performed for different testing conditions, as follows:
x The up-wind rotor is in operation while the down-wind rotor was removed and the electrical armature shaft
corresponding to the removed wind rotor has been blocked
x The down-wind rotor is in operation while the up-wind rotor was removed and the electrical armature shaft
corresponding to the removed wind rotor has been blocked
x Both wind turbines are operating (counter-rotating regime).
Based on the performed tests, there have been separately determined the characteristic parameters for each wind
rotor as well as for the both wind rotors in counter-rotating operation
In the design stage of the two rotors’ blades, the following geometrical elements have been adopted (depending
on the optimal availability in experimental model design stage):