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Modelling of spray flames with Doubly Conditional Moment Closure

Published version
Peer-reviewed

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Authors

Sitte, MP 
Mastorakos, Epaminondas  ORCID logo  https://orcid.org/0000-0001-8245-5188

Abstract

Simulations of a pilot-stabilised flame in a uniformly dispersed ethanol spray are performed using a Doubly Conditional Moment Closure (DCMC) model. The DCMC equation for spray combustion is derived, using the mixture fraction and the reaction progress variable as conditioning variables, including droplet evaporation and differential diffusion terms. A set of closure sub-models is suggested to allow for a first, preliminary application of the DCMC model to the test case presented here. In particular, the DCMC model is used to provide complete closure for the Favre-averaged spray terms in the mean and variance equations of the conditioning variables and the present test case is used to assess the importance of each term. Comparison with experimental data shows a promising overall agreement, while differences are related to modelling choices.

Description

Keywords

conditional moment closure, spray flames, pre-vaporisation, Ethanol

Journal Title

Flow, Turbulence and Combustion

Conference Name

Journal ISSN

1386-6184
1573-1987

Volume Title

99

Publisher

Springer
Sponsorship
Engineering and Physical Sciences Research Council (EP/K025791/1)
M.P. Sitte gratefully acknowledges funding from the Gates Cambridge Trust. The simulations were performed using the ARCHER UK National Supercomputing Service (http://www.archer.ac.uk) with computational time given by the UK Consortium on Turbulent Reacting Flows.