• axisymmetrical body
• wake flow
• frequency analysis

The object of the present work is the study of the wake of an axisymmetrical body in a three dimensional flow with the use of experimental results.
The final goal is to determine which are the parameters that link the boundary layer characteristics with the wake structure.
Three different configurations have been analysed: the first one of the model with smooth surface, the second one with the presence of a strip of emery cloth in the forward part of the body and the third with the use of two strips of emery cloth, in order to obtain different boundary layers at the end of the body.
For each configuration, a series of experimental data were achieved in order to characterize the variations of both the base pressure values and of the wake characteristics.
In the different configurations a frequency pick was detected both in the HWA and in the pressure signals and a following Wavelet-Hilbert analysis was carried out to link this frequency with its fluid-dynamical structure.