Abstract
The flutter is a dangerous phenomenon bringing down the destruction of aerofoil, so the prediction of the flutter speed is strongly required. In this paper, the theoretical calculation for a two-dimensional flat-plate aerofoil was carried out by using the unsteady aerofoil theory and the wind tunnel experiments for the flat-plate aerofoil was also carried out to clarify the relationship between the flutter speed and various parameters such as the elastic axis position, the bending natural frequency and the torsional natural frequency of the aerofoil. The results are summarized as follows: (1) The flutter speed decreases with going the elastic axis position downstream but increases beyond a certain elastic axis position. (2) The combination of the bending and torsional natural frequencies which makes the flutter speed minimum is the combination which the difference of two combined natural frequencies becomes minimum. (3) When the torsional natural frequency becomes higher than the bending natural frequency, the relation between these two frequencies becomes linear.
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