Velocity and scalar measurements in neighboring lifted edge flames

Amit Wason, William F. Carnell, Michael W. Renfro

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Laminar lifted edge flames stabilized above a five-exit slot burner are examined experimentally using particle imaging velocimetry and OH planar laser-induced fluorescence. In the present study, partially premixed methane and air are used to create a single lifted tribrachial flame that replicates many previous studies. Utilizing the same burner, two neighboring lifted tribrachial flames whose flow fields interact are also produced. This interaction results in a previously unknown bifurcation where two stable flame configurations are observed. For modest equivalence ratio gradients, the flow divergence around one flame edge pushes the other edge to an increased lift off height. The upper flame structure continues to impact the orientation and flow field around the lower flame. Global propagation velocities for the flame structure as a whole are greater than that for a single edge flame with the same equivalence ratio gradient. For very small equivalence ratio gradients, a chemical interaction between the edge flames is observed. The two edge flame structures eventually merge as the equivalence ratio gradient is reduced to a point approaching that of a fully premixed flame. These flame interactions may affect the stabilization of flame edges in turbulent flows where multiple stoichiometric points can exist in close proximity.

Original languageEnglish
Pages (from-to)789-811
Number of pages23
JournalCombustion Science and Technology
Volume178
Issue number5
DOIs
StatePublished - May 2006

Bibliographical note

Funding Information:
Received 29 October 2004; accepted 26 April 2005. This work is supported by the National Science Foundation (CTS-0235114, Program Manager: Dr. Linda Blevins). We appreciate the seeder design provided by Dr. Jeff Donbar (Air Force Research Laboratory, Dayton, OH), and the assistance of Mr. Timothy Russell and Robert Abel with the seeder construction and testing. We thank Prof. Baki Cetegen (Univ. Connecticut) for loaning the image intensifier used in the PLIF measurements. *Address correspondence to renfro@engr.uconn.edu

Keywords

  • Flame bifurcation
  • Flame interactions
  • Lifted edge flames
  • PIV
  • PLIF

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology
  • General Physics and Astronomy

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