Abstract
Wavelet analysis was applied to the prediction of flow separation from airfoil. Velocity fluctuations on the surface of the NACA631-012 airfoil at the attack angle of 5 degree were measured by a glue-on type hot-film probe in various chord positions. Morlet wavelet has the advantage to educe unsteady fluctuation over other signal analyses. The coefficient of the Morlet wavelet showed the change of the wavelet scale related to the precursor signal of flow separation. The result suggested that the wavelet analysis was a possible approach to predict and control of flow separation.
