Direct numerical simulations of non-premixed ethylene-air flames: Local flame extinction criterion

Handle URI:
http://hdl.handle.net/10754/563839
Title:
Direct numerical simulations of non-premixed ethylene-air flames: Local flame extinction criterion
Authors:
Lecoustre, Vivien R.; Arias, Paul G.; Roy, Somesh P.; Luo, Zhaoyu; Haworth, Daniel C.; Im, Hong G. ( 0000-0001-7080-1266 ) ; Lu, Tianfeng; Trouvé, Arnaud C.
Abstract:
Direct Numerical Simulations (DNS) of ethylene/air diffusion flame extinctions in decaying two-dimensional turbulence were performed. A Damköhler-number-based flame extinction criterion as provided by classical large activation energy asymptotic (AEA) theory is assessed for its validity in predicting flame extinction and compared to one based on Chemical Explosive Mode Analysis (CEMA) of the detailed chemistry. The DNS code solves compressible flow conservation equations using high order finite difference and explicit time integration schemes. The ethylene/air chemistry is simulated with a reduced mechanism that is generated based on the directed relation graph (DRG) based methods along with stiffness removal. The numerical configuration is an ethylene fuel strip embedded in ambient air and exposed to a prescribed decaying turbulent flow field. The emphasis of this study is on the several flame extinction events observed in contrived parametric simulations. A modified viscosity and changing pressure (MVCP) scheme was adopted in order to artificially manipulate the probability of flame extinction. Using MVCP, pressure was changed from the baseline case of 1 atm to 0.1 and 10 atm. In the high pressure MVCP case, the simulated flame is extinction-free, whereas in the low pressure MVCP case, the simulated flame features frequent extinction events and is close to global extinction. Results show that, despite its relative simplicity and provided that the global flame activation temperature is correctly calibrated, the AEA-based flame extinction criterion can accurately predict the simulated flame extinction events. It is also found that the AEA-based criterion provides predictions of flame extinction that are consistent with those provided by a CEMA-based criterion. This study supports the validity of a simple Damköhler-number-based criterion to predict flame extinction in engineering-level CFD models. © 2014 The Combustion Institute.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Computational Reacting Flow Laboratory (CRFL)
Publisher:
Elsevier BV
Journal:
Combustion and Flame
Issue Date:
Nov-2014
DOI:
10.1016/j.combustflame.2014.05.016
Type:
Article
ISSN:
00102180
Sponsors:
This work was sponsored by the National Science Foundation, PetaApps Program awarded to the multiple institutions, with Grant Nos.: OCI-0904660, OCI-0904480, OCI-0904649, OCI-0904771, OCI-0904818, OCI-0905008. The computational resources for the DNS simulations were supported by the NERSC. The authors would like to acknowledge the contributions of R. Sankaran at Oak Ridge National Laboratory; W. Wang from University of Tennessee; and Kwan-Liu Ma from University of California at Davis, for their help and helpful discussions in this work.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorLecoustre, Vivien R.en
dc.contributor.authorArias, Paul G.en
dc.contributor.authorRoy, Somesh P.en
dc.contributor.authorLuo, Zhaoyuen
dc.contributor.authorHaworth, Daniel C.en
dc.contributor.authorIm, Hong G.en
dc.contributor.authorLu, Tianfengen
dc.contributor.authorTrouvé, Arnaud C.en
dc.date.accessioned2015-08-03T12:16:25Zen
dc.date.available2015-08-03T12:16:25Zen
dc.date.issued2014-11en
dc.identifier.issn00102180en
dc.identifier.doi10.1016/j.combustflame.2014.05.016en
dc.identifier.urihttp://hdl.handle.net/10754/563839en
dc.description.abstractDirect Numerical Simulations (DNS) of ethylene/air diffusion flame extinctions in decaying two-dimensional turbulence were performed. A Damköhler-number-based flame extinction criterion as provided by classical large activation energy asymptotic (AEA) theory is assessed for its validity in predicting flame extinction and compared to one based on Chemical Explosive Mode Analysis (CEMA) of the detailed chemistry. The DNS code solves compressible flow conservation equations using high order finite difference and explicit time integration schemes. The ethylene/air chemistry is simulated with a reduced mechanism that is generated based on the directed relation graph (DRG) based methods along with stiffness removal. The numerical configuration is an ethylene fuel strip embedded in ambient air and exposed to a prescribed decaying turbulent flow field. The emphasis of this study is on the several flame extinction events observed in contrived parametric simulations. A modified viscosity and changing pressure (MVCP) scheme was adopted in order to artificially manipulate the probability of flame extinction. Using MVCP, pressure was changed from the baseline case of 1 atm to 0.1 and 10 atm. In the high pressure MVCP case, the simulated flame is extinction-free, whereas in the low pressure MVCP case, the simulated flame features frequent extinction events and is close to global extinction. Results show that, despite its relative simplicity and provided that the global flame activation temperature is correctly calibrated, the AEA-based flame extinction criterion can accurately predict the simulated flame extinction events. It is also found that the AEA-based criterion provides predictions of flame extinction that are consistent with those provided by a CEMA-based criterion. This study supports the validity of a simple Damköhler-number-based criterion to predict flame extinction in engineering-level CFD models. © 2014 The Combustion Institute.en
dc.description.sponsorshipThis work was sponsored by the National Science Foundation, PetaApps Program awarded to the multiple institutions, with Grant Nos.: OCI-0904660, OCI-0904480, OCI-0904649, OCI-0904771, OCI-0904818, OCI-0905008. The computational resources for the DNS simulations were supported by the NERSC. The authors would like to acknowledge the contributions of R. Sankaran at Oak Ridge National Laboratory; W. Wang from University of Tennessee; and Kwan-Liu Ma from University of California at Davis, for their help and helpful discussions in this work.en
dc.publisherElsevier BVen
dc.subjectChemical Explosive Mode Analysisen
dc.subjectDirect numerical simulationen
dc.subjectExtinction criterionen
dc.subjectFlame extinctionen
dc.subjectTurbulent diffusion flameen
dc.titleDirect numerical simulations of non-premixed ethylene-air flames: Local flame extinction criterionen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentComputational Reacting Flow Laboratory (CRFL)en
dc.identifier.journalCombustion and Flameen
dc.contributor.institutionFire Protection Engineering, University of MarylandCollege Park, MD, United Statesen
dc.contributor.institutionDepartment of Mechanical Engineering, University of MichiganAnn Arbor, MI, United Statesen
dc.contributor.institutionDepartment of Mechanical and Nuclear Engineering, Pennsylvania State UniversityUniversity Park, PA, United Statesen
dc.contributor.institutionDepartment of Mechanical Engineering, University of ConnecticutStorrs, CT, United Statesen
kaust.authorArias, Paul G.en
kaust.authorIm, Hong G.en
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.