Spontaneous raman measurements in turbulent Co/H2/N2 flames near extinction

A. R. Masri; R. W. Dibble

doi:10.1016/S0082-0784(89)80068-2

Spontaneous raman measurements in turbulent Co/H₂/N₂ flames near extinction

A. R. Masri^*, R. W. Dibble

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

Using the Rayleigh-Raman scattering technique, simultaneous space- and time-resolved measurements of temperature and the concentration of CO, CO₂, H₂, H₂O, O₂ and N₂ have been made in pilot stabilised turbulent nonpremixed flames of CO/H₂/N₂ near extinction. Five photomultiplier tubes are dedicated to monitor the background chemiluminecence which is broadband and interferes in varying degrees with all the Raman lines. This interference is corrected for using correction factors which relate the charges collected on each of these monitors to the chemiluminescence interference with each of the Raman lines. It is found that as the turbulent mixing rates increase, all reactive scalars which otherwise lie close to the equilibrium limits drift gradually away from those limits due to the chemical kinetic effects becoming significant. Unlike methane flames near blowoff, localised extinction does not occurs in CO/H₂/N₂ flames and the mechanism of extinction for these flames is therefore different. Inferences are made regarding the spatial structure of the reaction zones in turbulent nonpremixed CO/H₂/N₂ flames with finite rate chemical kinetics.

Original language	English (US)
Pages (from-to)	607-618
Number of pages	12
Journal	Symposium (International) on Combustion
Volume	22
Issue number	1
DOIs	https://doi.org/10.1016/S0082-0784(89)80068-2
State	Published - 1989
Externally published	Yes

ASJC Scopus subject areas

General Chemical Engineering
Fuel Technology
Energy Engineering and Power Technology
Mechanical Engineering
Physical and Theoretical Chemistry
Fluid Flow and Transfer Processes

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10.1016/S0082-0784(89)80068-2

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title = "Spontaneous raman measurements in turbulent Co/H2/N2 flames near extinction",

abstract = "Using the Rayleigh-Raman scattering technique, simultaneous space- and time-resolved measurements of temperature and the concentration of CO, CO2, H2, H2O, O2 and N2 have been made in pilot stabilised turbulent nonpremixed flames of CO/H2/N2 near extinction. Five photomultiplier tubes are dedicated to monitor the background chemiluminecence which is broadband and interferes in varying degrees with all the Raman lines. This interference is corrected for using correction factors which relate the charges collected on each of these monitors to the chemiluminescence interference with each of the Raman lines. It is found that as the turbulent mixing rates increase, all reactive scalars which otherwise lie close to the equilibrium limits drift gradually away from those limits due to the chemical kinetic effects becoming significant. Unlike methane flames near blowoff, localised extinction does not occurs in CO/H2/N2 flames and the mechanism of extinction for these flames is therefore different. Inferences are made regarding the spatial structure of the reaction zones in turbulent nonpremixed CO/H2/N2 flames with finite rate chemical kinetics.",

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year = "1989",

doi = "10.1016/S0082-0784(89)80068-2",

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T1 - Spontaneous raman measurements in turbulent Co/H2/N2 flames near extinction

AU - Masri, A. R.

AU - Dibble, R. W.

PY - 1989

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N2 - Using the Rayleigh-Raman scattering technique, simultaneous space- and time-resolved measurements of temperature and the concentration of CO, CO2, H2, H2O, O2 and N2 have been made in pilot stabilised turbulent nonpremixed flames of CO/H2/N2 near extinction. Five photomultiplier tubes are dedicated to monitor the background chemiluminecence which is broadband and interferes in varying degrees with all the Raman lines. This interference is corrected for using correction factors which relate the charges collected on each of these monitors to the chemiluminescence interference with each of the Raman lines. It is found that as the turbulent mixing rates increase, all reactive scalars which otherwise lie close to the equilibrium limits drift gradually away from those limits due to the chemical kinetic effects becoming significant. Unlike methane flames near blowoff, localised extinction does not occurs in CO/H2/N2 flames and the mechanism of extinction for these flames is therefore different. Inferences are made regarding the spatial structure of the reaction zones in turbulent nonpremixed CO/H2/N2 flames with finite rate chemical kinetics.

AB - Using the Rayleigh-Raman scattering technique, simultaneous space- and time-resolved measurements of temperature and the concentration of CO, CO2, H2, H2O, O2 and N2 have been made in pilot stabilised turbulent nonpremixed flames of CO/H2/N2 near extinction. Five photomultiplier tubes are dedicated to monitor the background chemiluminecence which is broadband and interferes in varying degrees with all the Raman lines. This interference is corrected for using correction factors which relate the charges collected on each of these monitors to the chemiluminescence interference with each of the Raman lines. It is found that as the turbulent mixing rates increase, all reactive scalars which otherwise lie close to the equilibrium limits drift gradually away from those limits due to the chemical kinetic effects becoming significant. Unlike methane flames near blowoff, localised extinction does not occurs in CO/H2/N2 flames and the mechanism of extinction for these flames is therefore different. Inferences are made regarding the spatial structure of the reaction zones in turbulent nonpremixed CO/H2/N2 flames with finite rate chemical kinetics.

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ER -

Spontaneous raman measurements in turbulent Co/H₂/N₂ flames near extinction

Abstract

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