Flow structure of swirling turbulent propane flames

Sergey V. Alekseenko, Vladimir M. Dulin, Yuriy S. Kozorezov, Dmitriy M. Markovich, Sergey I. Shtork, Mikhail P. Tokarev

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Flow structure of premixed propane-air swirling jet flames at various combustion regimes was studied experimentally by stereo PIV, CH chemiluminescence imaging, and pressure probe. For the non-swirling conditions, a nonlinear feedback mechanism of the flame front interaction with ring-like vortices, developing in the jet shear layer, was found to play important role in the stabilisation of the premixed lifted flame. For the studied swirl rates (S∈= 0.41, 0.7, and 1.0) the determined domain of stable combustion can be divided into three main groups of flame types: attached flames, quasi-tubular flames, and lifted flames. These regimes were studied in details for the case of S∈= 1.0, and the difference in the flow structure of the vortex breakdown is described. For the quasi-tubular flames an increase of flow precessing above the recirculation zone was observed when increased the stoichiometric coefficient from 0.7 to 1.4. This precessing motion was supposed to be responsible for the observed increase of acoustic noise generation and could drive the transition from the quasi-tubular to the lifted flame regime.

Original languageEnglish
Pages (from-to)569-595
Number of pages27
JournalFlow, Turbulence and Combustion
Volume87
Issue number4
DOIs
Publication statusPublished - 1 Jan 2011
Externally publishedYes

Keywords

  • Large-scale vortices
  • PIV
  • Premixed turbulent flame
  • Swirling flow
  • Vortex breakdown

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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