Flame stretch statistics in premixed jet flames at high reynolds number

Stefano Luca, Antonio Attili, Fabrizio Bisetti

Research output: Contribution to conferencePaperpeer-review

Abstract

A set of Direct Numerical Simulations (DNS) of turbulent jet flames is performed to investigate the effect of Reynolds number on flame characteristics. The simulations feature finite rate chemistry with 16 species and up to 22 billion grid points. The jet consists of a methane/air mixture with equivalence ratio φ = 0.7 and unburnt temperature of 800 K. The temperature and species concentrations in the coflow correspond to the equilibrium state of the burnt mixture. All the simulations are performed at 4 atm. The flame length, normalized by the jet width, decreases significantly as the Reynolds number increases. This is consistent with an increase of the turbulent flame speed due to the increased integral scale of turbulence. This behavior is typical of flames in the thin-reaction zone regime, which are affected by turbulent transport in the preheat layer. Statistics of stretch at the flame surface are investigated and the dependence of these quantities on the Reynolds number is assessed.

Original languageEnglish (US)
StatePublished - Jan 1 2017
Event11th Asia-Pacific Conference on Combustion, ASPACC 2017 - Sydney, Australia
Duration: Dec 10 2017Dec 14 2017

Conference

Conference11th Asia-Pacific Conference on Combustion, ASPACC 2017
CountryAustralia
CitySydney
Period12/10/1712/14/17

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Chemical Engineering(all)

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