Large Eddy Simulation of a supersonic lifted flame using the Eulerian stochastic fields method
File(s)
Accepted version
Author(s)
Almeida, YPD
Navarro-Martinez, S
Type
Journal Article
Abstract
Scramjet propulsion systems can be the key to deliver the next generation of hypersonic planes. The high costs and complexity of gathering experimental data is a limiting factor in the development of such engine. In this context, numerical simulation has become increasingly popular to investigate supersonic combustion phenomena that otherwise would be prohibitively expensive. Despite recent progress, the simulation of high-speed compressible and reactive flows is still very challenging and presents many associated challenges. The chemical source term is highly non-linear and most combustion models are designed to operate in low-Mach number conditions. The present work investigates the use of Probability Density Function (PDF) in the context of Large Eddy Simulation models under supersonic conditions. Two approaches are considered: an extension of the joint scalar-enthalpy PDF for high-speed flows and a novel joint velocity-scalar-energy PDF model. Both formulations use the Eulerian stochastic fields approach implemented in a fully compressible density-based CFD code. The performance of the models are investigated in a supersonic lifted flame, comparing the stochastic formulations with traditional models that neglect sub-grid fluctuations. The results show that sub-grid contributions are important at coarse meshes and the stochastic fields approach can reproduce the experimental data and the scatter observed. The simulations suggest that the scalar-enthalpy PDF is the most robust formulations and the sub-grid closures of the joint velocity-scalar PDF need further investigation.
Date Issued
2019-01-01
Date Acceptance
2018-08-24
Citation
Proceedings of the Combustion Institute, 2019, 37 (3), pp.3693-3701
ISSN
0082-0784
Publisher
Elsevier
Start Page
3693
End Page
3701
Journal / Book Title
Proceedings of the Combustion Institute
Volume
37
Issue
3
Copyright Statement
© 2018 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Identifier
https://www.sciencedirect.com/science/article/pii/S1540748918305844
Grant Number
EP/K026801/1
Subjects
Science & Technology
Physical Sciences
Technology
Thermodynamics
Energy & Fuels
Engineering, Chemical
Engineering, Mechanical
Engineering
Supersonic combustion
LES-PDF modelling
Eulerian stochastic fields
Lifted flame
PROBABILITY DENSITY-FUNCTION
PDF METHODS
COMBUSTION
SCALAR
VELOCITY
LES
0902 Automotive Engineering
0904 Chemical Engineering
0913 Mechanical Engineering
Publication Status
Published
Date Publish Online
2018-10-16