CUED Publications database

Detailed chemistry LES/CMC simulation of a swirling ethanol spray flame approaching blow-off

Giusti, A and Mastorakos, E (2017) Detailed chemistry LES/CMC simulation of a swirling ethanol spray flame approaching blow-off. Proceedings of the Combustion Institute, 36. pp. 2625-2632. ISSN 1540-7489

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Abstract

A swirling ethanol spray flame in conditions close to blow-off was simulated using Large Eddy Simulation (LES) and the Conditional Moment Closure (CMC) combustion model to further validate the capability of the LES/CMC approach to capture local extinctions in turbulent spray flames. A detailed chemical mechanism was employed and a transport equation of the mixture fraction sub-grid variance with spray interaction terms included was solved. Numerical results were in good agreement with the experiment in terms of both instantaneous and mean flame shape and droplet velocity and size. Local extinctions were observed in the region around the bluff-body leading in a fluctuating lift-off of the flame there and the probability density function of the lift-off height was in very good agreement with the experiment implying that the degree of local extinction is captured quantitatively. Analysis of the CMC equation suggested that local extinction was influenced by both transport in physical space and high scalar dissipation rate.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:11
Last Modified: 17 Aug 2017 01:25
DOI: