Upstream and lateral wind turbine wake effects on nearby wind turbine performance

Abstract A selection of different 1:50 scale rotor blades were evaluated with dynamometers, force balances, and wake measurements to select a rotor model which correctly simulates the full-scale behavior of an actual wind mill. A wind-tunnel measurement program was then carried out on a set of five dynamic (operating) wind mills placed at various heights and orrientations to one another. The interdependence of wind-turbine performance on such spacing was determined.