Joint statistics of mixture fraction and progress variable in piloted partially-premixed jet flames

Robert S. Barlow, Hugh Cutcher, Gaetano Magnotti, Assaad R. Masri

Research output: Contribution to conferencePaperpeer-review

Abstract

Mixture fraction and progress variable are central terms in many modeling approaches for partially-premixed combustion, and their variances and covariance appear in model closures. In the present work, the Bilger mixture fraction, ξ, and a progress variable based on oxygen, cO, are calculated from the mass fractions of seven measured species (CH4, O2, N2, CO2, H2O, CO, and H2). We examine the joint statistics of ξ and cO in two turbulent piloted methane-air jet flames that exhibit different levels of compositional inhomogeneity at the inlet and hence different modes of combustion near the flame base. The Favre covariance, ξ"cO", and correlation coefficient, Rξ,c, behave very differently in the near field of these two flames, with the magnitude of both being much lower in the stratified-premixed reaction zone of the flame with an inhomogeneous exit profile of mixture fraction. Farther downstream in each flame, the joint pdfs and correlation statistics in both flames are influenced by the degree of local extinction.

Original languageEnglish (US)
StatePublished - Jan 1 2016
Event2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016 - Princeton, United States
Duration: Mar 13 2016Mar 16 2016

Other

Other2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016
CountryUnited States
CityPrinceton
Period03/13/1603/16/16

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Chemical Engineering(all)

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