Structure of ethylene based nonpremixed flames stabilised on a JHC burner

Paul R. Medwell; Peter A.M. Kalt; Bassam B. Dally

Structure of ethylene based nonpremixed flames stabilised on a JHC burner

Paul R. Medwell, Peter A.M. Kalt, Bassam B. Dally

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The spatial distribution of OH, formaldehyde (H2CO) and temperature imaged by laser diagnostic techniques are presented using the Jet in Hot Coflow (JHC) burner. The measurements are of nonpremixed ethylene jet flames with various diluents in a hot and highly diluted coflow. These conditions emulate those of Moderate or Intense Low Oxygen Dilution (MILD) combustion. With a 3% O2 coflow a faint outline is seen to extend to the jet exit plane, whereas the higher 9% O2 flames visually appear lifted. In flames which appear lifted, a continuous OH surface has been identified which extends to the jet exit. Nevertheless, at the "lift-off" height a transition from weak to strong OH is observed. H2CO is also observed to exist upstream of the transition point, further evidence of a pre-ignition reaction taking place in the "lifted" flames.

Original language	English (US)
Title of host publication	6th Asia-Pacific Conference on Combustion, ASPACC 2007
Publisher	Combustion Institute
State	Published - Jan 1 2007
Externally published	Yes

Cite this

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title = "Structure of ethylene based nonpremixed flames stabilised on a JHC burner",

abstract = "The spatial distribution of OH, formaldehyde (H2CO) and temperature imaged by laser diagnostic techniques are presented using the Jet in Hot Coflow (JHC) burner. The measurements are of nonpremixed ethylene jet flames with various diluents in a hot and highly diluted coflow. These conditions emulate those of Moderate or Intense Low Oxygen Dilution (MILD) combustion. With a 3% O2 coflow a faint outline is seen to extend to the jet exit plane, whereas the higher 9% O2 flames visually appear lifted. In flames which appear lifted, a continuous OH surface has been identified which extends to the jet exit. Nevertheless, at the {"}lift-off{"} height a transition from weak to strong OH is observed. H2CO is also observed to exist upstream of the transition point, further evidence of a pre-ignition reaction taking place in the {"}lifted{"} flames.",

author = "Medwell, {Paul R.} and Kalt, {Peter A.M.} and Dally, {Bassam B.}",

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year = "2007",

month = jan,

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language = "English (US)",

booktitle = "6th Asia-Pacific Conference on Combustion, ASPACC 2007",

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T1 - Structure of ethylene based nonpremixed flames stabilised on a JHC burner

AU - Medwell, Paul R.

AU - Kalt, Peter A.M.

AU - Dally, Bassam B.

N1 - Generated from Scopus record by KAUST IRTS on 2022-09-12

PY - 2007/1/1

Y1 - 2007/1/1

N2 - The spatial distribution of OH, formaldehyde (H2CO) and temperature imaged by laser diagnostic techniques are presented using the Jet in Hot Coflow (JHC) burner. The measurements are of nonpremixed ethylene jet flames with various diluents in a hot and highly diluted coflow. These conditions emulate those of Moderate or Intense Low Oxygen Dilution (MILD) combustion. With a 3% O2 coflow a faint outline is seen to extend to the jet exit plane, whereas the higher 9% O2 flames visually appear lifted. In flames which appear lifted, a continuous OH surface has been identified which extends to the jet exit. Nevertheless, at the "lift-off" height a transition from weak to strong OH is observed. H2CO is also observed to exist upstream of the transition point, further evidence of a pre-ignition reaction taking place in the "lifted" flames.

AB - The spatial distribution of OH, formaldehyde (H2CO) and temperature imaged by laser diagnostic techniques are presented using the Jet in Hot Coflow (JHC) burner. The measurements are of nonpremixed ethylene jet flames with various diluents in a hot and highly diluted coflow. These conditions emulate those of Moderate or Intense Low Oxygen Dilution (MILD) combustion. With a 3% O2 coflow a faint outline is seen to extend to the jet exit plane, whereas the higher 9% O2 flames visually appear lifted. In flames which appear lifted, a continuous OH surface has been identified which extends to the jet exit. Nevertheless, at the "lift-off" height a transition from weak to strong OH is observed. H2CO is also observed to exist upstream of the transition point, further evidence of a pre-ignition reaction taking place in the "lifted" flames.

UR - http://www.scopus.com/inward/record.url?scp=85126508683&partnerID=8YFLogxK

M3 - Conference contribution

BT - 6th Asia-Pacific Conference on Combustion, ASPACC 2007

PB - Combustion Institute

ER -

Structure of ethylene based nonpremixed flames stabilised on a JHC burner

Abstract

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