Propagation and quenching of premixed flames in a concentration-length-velocity diagram

Yongjin Jung, Min Jung Lee, Nam Il Kim

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The flame propagation velocity (FPV) deviates from the laminar burning velocity (LBV) when a premixed flame is formulated in a combustion space having limited length-scales. The variation of the FPV depending on the length-scale was experimentally examined using an enhanced state-of-the-art annular stepwise diverging tube. Using a transient method abundant experimental data were obtained for different fuel concentrations establishing a continuous physical surface in a Concentration-Length-Velocity diagram (CLV-diagram). The CLV-diagrams for methane and propane flames are successfully described. Three projected planes of the CLV-diagram are related to conventional laminar flame theories and a comparison of them shows additional hidden mechanisms. The relationship between the critical FPV or LBV and the quenching distances is identified with the Lewis number. The flame stretch and Markstein length with respect to the FPV are discussed.

Original languageEnglish
Pages (from-to)4243-4251
Number of pages9
JournalProceedings of the Combustion Institute
Volume36
Issue number3
DOIs
StatePublished - 2017

Keywords

  • Annular stepwise diverging tube
  • Flame propagation velocity
  • Laminar burning velocity
  • Mesoscale combustion
  • Quenching distance

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