With the aim of getting basic data to increase the efficiency of a small horizontal axis wind turbine (HAWT) systems, the wind tunnel experiments were carried out to observe flow characteristics of rotating blades of the turbine, using the oil-film visualization technique, and to measure turbine performance. Flow visualization allowed the identification of laminar flow, laminar separation bubble formation, flow reattachment, turbulent boundary layer, and turbulent separation. The complex patterns on the rotating blade surface were confirmed by the oil-film visualization method and identified. When the trip-tape was employed for control of the blade boundary layer, the efficiency was not significantly improved. Field-tests of this turbine were performed also, and averages of wind speed and net power were calculated from the field measured data using the bins method and were compared with wind tunnel performance tests. The results of field-tests showed for this small HAWT that the highest power coefficient value was 30%.

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