Instantaneous and time-resolved blowoff transition measurements for two-dimensional bluff body-stabilized flames in vitiated flow

Steven G. Tuttle, Stanislav Kostka, Swetaprovo Chaudhuri, Marat Kulakhmetov, Baki M. Cetegen, Michael W. Renfro

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Stable and transitional blow off characteristics of turbulent, two-dimensional, bluff body-stabilized premixed flames were studied in a rectangular duct with a triangular flame holder in the midspan of the duct cross section in vitiated flow, with and without cooling. The transitional blowoff dynamics were characterized with high-speed imaging and measurements of CH chemiluminescence emissions from the wake. Simultaneous PIV and OH PLIF were used to observe both stable and transitional blow off flame dynamics. With both high-speed imaging and PLIF, the flame sheet was observed to shift from burning on the upstream side of the wake shear layer to within the shear layer, and then finally in the recirculation zone before finally blowing off. Flames in vitiated, uncooled air remained stable at temperature ratios near 2.36 while the shear layer exhibited Kelvin-Helmholtz vortex shedding. Blow off occurred at temperature ratios from 2.08 to 2.18, with blow off temperature ratios increasing with the bulk velocity. An approximate integral length scale was calculated from PIV measurements in the isothermal and reacting flows. Incorporating laminar flame calculations, the turbulent combustion regime was determined to be in the range of corrugated and wrinkled flames.

Original languageEnglish
Title of host publicationFall Meeting of the Eastern States Section of the Combustion Institute 2009
Pages50-59
Number of pages10
ISBN (Electronic)9781615676682
StatePublished - 2009
EventFall Meeting of the Eastern States Section of the Combustion Institute 2009 - College Park, United States
Duration: Oct 18 2009Oct 21 2009

Publication series

NameFall Meeting of the Eastern States Section of the Combustion Institute 2009

Conference

ConferenceFall Meeting of the Eastern States Section of the Combustion Institute 2009
Country/TerritoryUnited States
CityCollege Park
Period10/18/0910/21/09

ASJC Scopus subject areas

  • General Chemical Engineering
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

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