A series of tests on small Darrieus-Troposkein Turbines (DTT) were performed with a wind tunnel, to determine the speed deficit and turbulence intensity that adds to the wake. These tests were made in order to provide information on the interaction that could result on an array of this type of wind turbines, laid on the rooftop of a building. The tested turbines had a diameter of 0.85 m and a height of 1.30 m. It had two blades of symmetrical cross section NACA 0024, with a solidity of 0.44 and tested with a Specific Speed (TRS) of 2.5. The decrease of the rotor speed was 10% with a wind speed from 9 to 13 m/s. The turbulence intensity added by the turbine in the wake, measured at a distance of one diameter was 0.27, and 0.17 measured at two diameters.
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