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. This paper describes aerodynamic characteristics of an Archimedes spiral wind turbine with variousangles of attack. The range of angles was controlled from - 30 o (clockwise) to + 30 (clockwise). The rotatingspeed of wind turbine at the same angle of attack in both directions was different. The reason why the-maximum rotational speed was observed at 15 o in clockwise direction can be explained based on angularmomentum conservation. Quantitative flow visualization around Archimedes wind turbine blade was carriedout between -15 o (clockwise) and +15 (counter clockwise) using high resolution PIV method. The relation-ship between drag force and rotating speeds was discussed. From these results, optimum design on yawingsystem of Archimedes spiral wind turbine may provide high efficiency on small wind power system.Key Words:Spiral Wind Power Generation(), Archimedes Spiral( ),Aerodynamics Characteristics(), PIV measurement(PIV), Angle of Attack()  θ: Angle of Attack [

Flow Characteristics around Archimedes Wind Turbine according to the Change of Angle of Attack