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Tesi etd-03152013-153602


Thesis type
Tesi di laurea magistrale
Author
FINOCCHI, FRANCESCO
URN
etd-03152013-153602
Title
Wind tunnel investigation on the near-wake flow of an axisymmetrical body: characterization of the pressure and velocity fields by means of time-frequency analysis
Struttura
INGEGNERIA CIVILE E INDUSTRIALE
Corso di studi
INGEGNERIA AEROSPAZIALE
Commissione
relatore Prof. Buresti, Guido
relatore Ing. Mariotti, Alessandro
Parole chiave
  • axisymmetrical body
  • wake flow
  • frequency analysis
Data inizio appello
15/04/2013;
Consultabilità
parziale
Data di rilascio
15/04/2053
Riassunto analitico
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.
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