Experimental investigation on flame characteristics in a porous-free flame burner

Seyed Amin Ghorashi, Seyed Abdolmehdi Hashemi, Mahdi Mollamahdi, Mojtaba Ghanbari, Yasser Mahmoudi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
129 Downloads (Pure)


Present work studies experimentally the flame characteristics of a premixed natural gas/air mixture is a porous-free flame (PFF) burner compares it with a conventional porous (metal foam) burner with a porosity of 87%, height of 22 mm and diameter of 90 mm. For the PFF burner a hole is created at the center of the metal foam, making a combination of a free flame and a flame in the porous region. Effects of the hole diameter, d= [6, 9 and 12 mm], foams pore density λ=10, 20 and 30 pores per inch (ppi) and foam materials (SiC and Al2O3) on the axial temperature distributions of the foams as well as on the lean and rich limits are examined. The results show that for a fixed foam pore density and foam material, the axial temperature of the foam in the PFF burner is lower than that of the porous burner. Compared to the PFF burner, the flame in the porous burner is stabilized at a lower equivalence ratio (leaner mixture), while the PFF burner extends the rich limit of the flame. Additionally, the diameter of the hole found to have insignificant influence on the lean and rich limits. Results further show that an increase in the foams pore density leads to a decrease in the axial temperature of the foam and the lean/rich limit of the flame. The axial temperature of the SiC foam found to be higher than that of the Al2O3 porous foam. Furthermore, the lean and rich limits are extended by deploying the SiC porous foam.
Original languageEnglish
JournalHeat and Mass Transfer
Publication statusPublished - 17 Feb 2020


  • Experiment
  • Porous-free flame burner
  • Porous burner
  • Flame stabilization
  • Lean limit
  • Rich limit

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Fluid Flow and Transfer Processes


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