Numerical investigation of the effect of pressure on heat release rate in iso-octane premixed turbulent flames under conditions relevant to SI engines
Abstract
A series of direct numerical simulations (DNS) of iso-octane/air turbulent premixed flames in the thin reaction zones regime have been performed in order to investigate the effect of pressure on heat release rate under conditions relevant to spark-ignition (SI) engines (up to 20 bar and 800 K in the unburnt gas). Chemistry is represented by a reduced kinetics mechanism containing 74 species and 976 reactions (reduced from CaltechMech). The effect of pressure has been isolated by fixing the Karlovitz numbers, the Lewis numbers, and the ratio of integral length scale to laminar flame thickness. On one hand, the results suggest that pressure has very limited effect on the mean heat release rate, such that turbulent burning velocity is proportional to the turbulent surface area. In addition, while the chemical pathways are strongly affected by pressure in laminar flames, the global effect of turbulence on these pathways is negligible, independent of pressure. On the other hand, the local distribution of heat release rate was found to be significantly affected by pressure through differential diffusion-chemistry effects.
Additional Information
© 2016 The Combustion Institute. Published by Elsevier Inc. Supplementary Raw Research Data -- This is open data under the CC BY license http://creativecommons.org/licenses/by/4.0/. Received 4 December 2015, Revised 12 July 2016, Accepted 13 July 2016, Available online 10 October 2016. The authors gratefully acknowledge funding from the Fonds de recherche du Québec - Nature et technologies (postdoctoral scholarship B3), the Social Found of the European Union (Scholarship for Visiting Professor at the Warsaw University of Technology), the U.S. Department of Energy-Basic Energy Sciences (DE-SC006591) under the supervision of Dr. Wade Sisk, and the Air Force Office of Scientific Research (Award FA9550-12-1-0144) under the supervision of Dr. Chiping Li.Attached Files
Supplemental Material - mmc1.pdf
Supplemental Material - mmc2.pdf
Supplemental Material - mmc3.pdf
Supplemental Material - mmc4.pdf
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Additional details
- Eprint ID
- 74663
- Resolver ID
- CaltechAUTHORS:20170302-082907347
- Fonds Québécois de la Recherche sur la Nature et les Technologies (FQRNT)
- European Social Fund
- DE-SC006591
- Department of Energy (DOE)
- FA9550-12-1-0144
- Air Force Office of Scientific Research (AFOSR)
- Created
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2017-03-02Created from EPrint's datestamp field
- Updated
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2021-11-11Created from EPrint's last_modified field