Abstract
Unsteady stall characteristics of a blade oscillating in pitch at an angle of attack near stall region are examined including a dynamic hysteresis phenomenon of stalling in the process of changing the reduced frequency. Effects of this dynamic hysteresis phenomenon on unsteady aerodynamic characteristics of an oscillating blade are made clear in a region where either state of a fully separated flow or an attached (strictly speaking, partially separated) flow persists continuously during the blade oscillation depending upon the history of frequency variation. It is also found that the characteristics of aerodynamic damping are affected remarkably by the dynamic hysteresis phenomenon depending upon the location of pitching center.
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