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In this paper changes in wind speed and wind direction from a measured windfield are being analyzed at high frequencies. This is used to estimate changesin the angle of attack (AOA) on a blade segment over short time periods fordifferent estimated turbine concepts. Here a statistical approach is chosen tograsp the characteristics of the probability distributions to give an over allview of the magnitude and rate of the changes. The main interest is thegeneration of basic distributions for the calculation of dynamic stall effectsand stall flutter due to wind fluctuations.

Effects of Sudden Changes in Inflow Conditions on the Angle of Attack on HAWT Blades