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Large eddy simulation of an ethanol spray flame with secondary droplet breakup

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Title: Large eddy simulation of an ethanol spray flame with secondary droplet breakup
Authors: Gallot-Lavallee, S
Jones, WP
Marquis, AJ
Item Type: Journal Article
Abstract: A computational investigation of three configurations of the Delft Spray in Hot-diluted Co-flow (DSHC) is presented. The selected burner comprises a hollow cone pressure swirl atomiser, injecting an ethanol spray, located in the centre of a hot co-flow generator, with the conditions studied corresponding to Moderate or Intense Low-oxygen Dilution (MILD) combustion. The simulations are performed in the context of Large Eddy Simulation (LES) in combination with a transport equation for the joint probability density function (pdf) of the scalars, solved using the Eulerian stochastic field method. The liquid phase is simulated by the use of a Lagrangian point particle approach, where the sub-grid-scale interactions are modelled with a stochastic approach. Droplet breakup is represented by a simple primary breakup model in combination with a stochastic secondary breakup formulation. The approach requires only a minimal knowledge of the fuel injector and avoids the need to specify droplet size and velocity distributions at the injection point. The method produces satisfactory agreement with the experimental data and the velocity fields of the gas and liquid phase both averaged and ‘size-class by size-class’ are well depicted. Two widely accepted evaporation models, utilising a phase equilibrium assumption, are used to investigate the influence of evaporation on the evolution of the liquid phase and the effects on the flame. An analysis on the dynamics of stabilisation sheds light on the importance of droplet size in the three spray flames; different size droplets play different roles in the stabilisation of the flames.
Issue Date: 1-Apr-2021
Date of Acceptance: 22-Jan-2021
URI: http://hdl.handle.net/10044/1/91234
DOI: 10.1007/s10494-021-00248-z
ISSN: 0003-6994
Publisher: Springer
Start Page: 709
End Page: 743
Journal / Book Title: Flow, Turbulence and Combustion
Volume: 107
Copyright Statement: © The Author(s) 2021. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
General Electric (Switzerland) GmbH
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/K026801/1
4500697255
BH172740 (EP/R029369/1)
Keywords: Science & Technology
Physical Sciences
Technology
Thermodynamics
Mechanics
Large eddy simulation
Probability Density Function (PDF) approach
Eulerian
stochastic field method
Stochastic breakup model
Droplet evaporation
Science & Technology
Physical Sciences
Technology
Thermodynamics
Mechanics
Large eddy simulation
Probability Density Function (PDF) approach
Eulerian
stochastic field method
Stochastic breakup model
Droplet evaporation
09 Engineering
Mechanical Engineering & Transports
Fluids & Plasmas
Publication Status: Published
Online Publication Date: 2021-04-01
Appears in Collections:Mechanical Engineering
Faculty of Engineering



This item is licensed under a Creative Commons License Creative Commons