ETD

Archivio digitale delle tesi discusse presso l'Università di Pisa

Tesi etd-09212009-085555


Tipo di tesi
Tesi di laurea specialistica
Autore
CUZZOLA, FRANCESCO GIOVANNI
URN
etd-09212009-085555
Titolo
An investigation on drag reduction for axisymmetric bodies
Dipartimento
INGEGNERIA
Corso di studi
INGEGNERIA AEROSPAZIALE
Relatori
relatore Dott. Dorrington, Graham
relatore Prof. Lombardi, Giovanni
Parole chiave
  • fluid mechanics
  • axisymmetric
  • drag reduction
Data inizio appello
13/10/2009
Consultabilità
Completa
Riassunto
This thesis, carried out in collaboration with the Queen Mary University of London, has the aim of study drag reduction devices for axisymmetric bodies using both experiments on wind tunnel and numerical flow simulations.
Models used for wind tunnel experiments were a 4:1 ellipsoid, with the possibility to replace the rear section with a conic boat tail and a 4:1 prolate ellipsoid; this last model was equipped with an internal fan and modified with an intake at the rear for wake aspiration and a conic mid-section in order to perform boundary layer blowing from an annular slot.
Results show how the presence of a conic boat tail lead to a reduction of the form drag and boundary layer suction/wake aspiration have great impact on reducing both viscous and form drag. In this latter case it is suggested, as a future development, a study of the ratio between power saved from the drag reduction and power used by active drag reducing device.
CFD main result is that the numerical predictions are capable to follow the experimental trend just with K-Omega SST turbulence model.
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