Crispo, Cuono Massimo (2017) Investigation of chevron synthetic jets flow field and heat transfer. [Tesi di dottorato]

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Item Type: Tesi di dottorato
Lingua: English
Title: Investigation of chevron synthetic jets flow field and heat transfer
Creators:
CreatorsEmail
Crispo, Cuono Massimocuonomassimo.crispo@gmail.com
Date: 9 December 2017
Number of Pages: 158
Institution: Università degli Studi di Napoli Federico II
Department: dep11
Dottorato: phd046
Ciclo di dottorato: 30
Coordinatore del Corso di dottorato:
nomeemail
Grassi, Michelemichele.grassi@unina.it
Tutor:
nomeemail
Cardone, GennaroUNSPECIFIED
Greco, Carlo SalvatoreUNSPECIFIED
Date: 9 December 2017
Number of Pages: 158
Uncontrolled Keywords: Chevron, Synthetic jets, Convective heat transfer enhancement
Settori scientifico-disciplinari del MIUR: Area 09 - Ingegneria industriale e dell'informazione > ING-IND/06 - Fluidodinamica
Date Deposited: 06 Jan 2018 14:03
Last Modified: 05 Apr 2019 10:51
URI: http://www.fedoa.unina.it/id/eprint/12095

Abstract

The present thesis analyses the effect of a saw-tooth exit pattern, called chevron exit, on the flow field and heat transfer of a synthetic jet. The chevron exits are generally applied at the trailing edge of jet engine nozzles for acoustic noise reduction and mixing enhancement. For the present study, the synthetic jet is obtained by a loudspeaker as oscillating element and a contoured nozzle as inlet/outlet aperture. Two experimental techniques are used: Stereoscopic Particle Image Velocimetry for the two-dimensional three-component flow field measurements and Infrared thermography in conjunction with the heated thin foil heat transfer sensor for the heat transfer measurements. Owing to the peculiar features of synthetic jets and the effect of the chevron elements on the coherent structures organisation, the chevron exit could lead to a heat transfer enhancement. It is shown that this kind of nozzle can produce an increase of turbulence intensity levels in some regions of the field and entrainment and mixing enhancement by introducing streamwise coherent structures.

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