Experimental determination of burning velocity in metal dust explosions

Vaccaro, Danilo (2021) Experimental determination of burning velocity in metal dust explosions. [Laurea magistrale], Università di Bologna, Corso di Studio in Ingegneria chimica e di processo [LM-DM270], Documento full-text non disponibile
Il full-text non è disponibile per scelta dell'autore. (Contatta l'autore)

Abstract

The modeling of metal dust explosion phenomenon is important in order to safeguard industries from potential accidents. A key parameter of these models is the burning velocity, which represents the consumption rate of the reactants by the flame front, during the combustion process. This work is focused on the experimental determination of aluminium burning velocity, through an alternative method, called "Direct method". The study of the methods used and the results obtained is preceded by a general analysis on dust explosion phenomenon, flame propagation phenomenon, characteristics of the metals combustion process and standard methods for determining the burning velocity. The “Direct method” requires a flame propagating through a tube recorded by high-speed cameras. Thus, the flame propagation test is carried out inside a vertical prototype made of glass. The study considers two optical technique: the direct visualization of the light emitted by the flame and the Particle Image Velocimetry (PIV) technique. These techniques were used simultaneously and allow the determination of two velocities: the flame propagation velocity and the flow velocity of the unburnt mixture. Since the burning velocity is defined by these two quantities, its direct determination is done by substracting the flow velocity of the fresh mixture from the flame propagation velocity. The results obtained by this direct determination, are approximated by a linear curve and different non-linear curves, which show a fluctuating behaviour of burning velocity. Furthermore, the burning velocity is strongly affected by turbulence. Turbulence intensity can be evaluated from PIV technique data. A comparison between burning velocity and turbulence intensity highlighted that both have a similar trend.

Abstract
Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Vaccaro, Danilo
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
Curriculum ingegneria alimentare
Ordinamento Cds
DM270
Parole chiave
burning velocity,flame propagation,particle image velocimetry PIV,direct visualization,turbulence intensity
Data di discussione della Tesi
12 Marzo 2021
URI

Altri metadati

Gestione del documento: Visualizza il documento

^