Abstract
Dynamic forces on an aerofoil which changes pitch angle with constant speed in uniform air flow are measured. In our previous report, we could not measure these forces for high speed change of pitch angle because of resonance on the actuating and sensing systems. Pitching mechanism is improved: an actuator, which changes pitch angle speed, is exchanged from a pulse motor to a servomotor and a sensor is exchanged from an optical displacement meter to a load cell. Two dynamic characteristics are measured as follows: transient properties for quick increase of pitch angle and dynamic ones for triangular motion of an aerofoil (saw-toothwise change of pitch angle). We obtain the following results: For triangular pitching motion, clockwise hysteresis loops are formed in the lift and the drag curves. Then, the transition of those loops can be described. Maximum lift coefficient and dynamic stall angle of aerofoil tend to be saturated with increasing in the angular velocity of pitching motion.
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