Second-order closure for turbulent nonpremixed flames: scalar dissipation and heat release effects

Robert Dibble*, W. kollman, M. Farshchi, R. W. Schefer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A second-order closure model for reacting turbulent flows is presented and evaluated by comparing the results with measurements in a turbulent nonpremixed flame. In particular, a model for the Reynolds stress components, which specifically includes the effects of chemical heat release on the Reynolds stress components, is put forward. Predictions with this new closure are in agreement with the present experimental data. The analysis shows that the heat release terms are of importance for the time-scale ratio. The time-scale ratio is not constant and is sensitive to density fluctuations. Accordingly, the heat release due to combustion affects the scalar field differently than the velocity field.

Original languageEnglish (US)
Pages (from-to)1329-1340
Number of pages12
JournalSymposium (International) on Combustion
Volume21
Issue number1
DOIs
StatePublished - Jan 1 1988

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

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