TY - GEN
T1 - Instantaneous and time-resolved blowoff transition measurements for two-dimensional bluff body-stabilized flames in vitiated flow
AU - Tuttle, Steven G.
AU - Kostka, Stanislav
AU - Chaudhuri, Swetaprovo
AU - Kulakhmetov, Marat
AU - Cetegen, Baki M.
AU - Renfro, Michael W.
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:84946570025
T3 - Fall Meeting of the Eastern States Section of the Combustion Institute 2009
SP - 50
EP - 59
BT - Fall Meeting of the Eastern States Section of the Combustion Institute 2009
T2 - Fall Meeting of the Eastern States Section of the Combustion Institute 2009
Y2 - 18 October 2009 through 21 October 2009
ER -