Comparison of saturated and linear laser-induced fluorescence measurements of nitric oxide in counterflow diffusion flames

Ravikrishna, RV; Cooper, Clayton S.; Laurendeau, Normand M.

doi:10.1016/s0010-2180(98)00123-0

Cited by 27 publications

(12 citation statements)

References 19 publications

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“…This indicates that the model inadequately predicts the real position of the temperature profile, and, hence the flame position. This was also noted by other researchers [5,15,16]. In addition, MacDonald et al [5] found that the calculated hydroxyl concentration profile gives a poor fit (for the position of the concentration maximum) to the experimental data obtained spectroscopically.…”

Section: Thermal Structure Of the Flamesupporting

confidence: 63%

Investigation of the structure of a CH4/N2-O2/N2 Counterflow diffusion flame using molecular beam and microprobe mass spectrometry

Knyazkov

Коробейничев

Шмаков

2006

Combust Explos Shock Waves

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The possibility of using molecular beam mass spectrometry (MBMS) to study the structure of counterflow flames was shown by the example of a CH 4 /N 2 -O 2 /N 2 flame. The thermal structure of the flame was studied, and the CH 4 , O 2 , and CO 2 concentration distributions were measured using a microprobe technique and MBMS. The results of the measurements performed by the two methods were compared. The MBMS technique was used to study the hydroxyl concentration distribution in the flame. The species concentrations and temperature profiles on the burner axis were calculated.

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Section: Thermal Structure Of the Flamesupporting

confidence: 63%

Investigation of the structure of a CH4/N2-O2/N2 Counterflow diffusion flame using molecular beam and microprobe mass spectrometry

Knyazkov

Коробейничев

Шмаков

2006

Combust Explos Shock Waves

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“…The global strain rate, defined here as the sum of the oxidizer and fuel stream velocities divided by the nozzle separation distance, is maintained constant at 30 s À1 . The influence of strain rate on NO formation has been studied extensively in our previous investigations Ravikrishna et al, 1999. Here, the objective was to study these flames at various pressures up to the maximum pressure allowed by our burner system.…”

Section: Experimental Techniquesmentioning

confidence: 99%

“…Regarding any effects of rotational energy transfer (RET), the laser fluence we used is very low (<0.1 mJ/mm 2 Ápulse) and well within the linear LIF regime, as ensured by the linearity of an LIF signal vs. laser irradiance plot (Ravikrishna et al, 1999). Most importantly, we have previously conducted laser-saturated fluorescence (LSF) measurements (Ravikrishna et al, 1999), for which laser energies were very high.…”

Section: Lif Measurements Of No In High-pressure Flames 11mentioning

confidence: 99%

“…We have previously conducted several such investigations Ravikrishna et al, 1999. In these studies, we have used the counterflow flame configuration because concentration and temperature measurements can be made away from potentially interfering surfaces, and the fluid dynamics of this flame configuration allow for ease of modeling.…”

Section: Introductionmentioning

confidence: 99%

“…The formation of NO in laminar counterflow diffusion flames has been studied mostly at atmospheric pressure by past researchers (Atreya et al, 1996;Bonturi et al, 1997;Blint, 1989, 1991;Hahn and Wendt, 1981;Li et al, 1997;Nishioka et al, 1994;Laurendeau, 1998, 2000;Ravikrishna et al, 1999;Sick et al, 1998). The only previous experimental work on NO measurements in high-pressure counterflow diffusion flames is our own work , which represents the first reported measurements of [NO] in such flames.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative Laser-Induced Fluorescence Measurements and Modeling of Nitric Oxide in High-Pressure (6–15 Atm) Counterflow Diffusion Flames

Ravikrishna

Naik²,

Cooper³

et al. 2004

Combustion Science and Technology

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Laser-induced fluorescence (LIF) measurements of NO concentration ([NO])have been obtained along the centerline of methane-air counterflow diffusion flames at 6 to 15 atm. This study is an extension of our previous work involving measurements of [NO] in similar flames at two to five atm, wherein we had used a counterflow premixed flame for calibration. For the flames studied here, a method based on computed overlap fractions is developed to calibrate [NO] measurements at higher pressures. The linear LIF measurements of [NO], which are corrected for variations in the electronic quenching rate coefficient, are compared with numerical predictions from an opposed-flow flame code utilizing two Gas Research Institute (GRI) chemical kinetic mechanisms (versions 2.11 and 3.0). The effect of radiative heat loss on code predictions is accounted for by using an optically thin radiation model. The revised GRI mechanism (version 3.0) offers a significant improvement in prompt-NO predictions for these flames compared to the older version (2.11), especially at pressures below eight atm. However, a consistent discrepancy remains in the comparisons, particularly at peak NO locations for pressures lower than six atm. The measurements display a continuing trend of decreasing NO concentration with increasing pressure at 6-15 atm as expected for flames dominated by prompt NO. The discrepancy between measurements and predictions decreases with rising pressure so that the revised GRI mechanism predicts [NO] with reasonable accuracy at pressures above six atm.

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Spectroscopic, calibration and RET issues for linear laser-induced fluorescence measurements of nitric oxide in high-pressure diffusion flames

Naik

Laurendeau

2004

Appl Phys B

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Comparison of saturated and linear laser-induced fluorescence measurements of nitric oxide in counterflow diffusion flames

Cited by 27 publications

References 19 publications

Investigation of the structure of a CH4/N2-O2/N2 Counterflow diffusion flame using molecular beam and microprobe mass spectrometry

Investigation of the structure of a CH4/N2-O2/N2 Counterflow diffusion flame using molecular beam and microprobe mass spectrometry

Quantitative Laser-Induced Fluorescence Measurements and Modeling of Nitric Oxide in High-Pressure (6–15 Atm) Counterflow Diffusion Flames

Spectroscopic, calibration and RET issues for linear laser-induced fluorescence measurements of nitric oxide in high-pressure diffusion flames

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