SEMI-QUANTITATIVE MEASUREMENTS OF CH CONCENTRATION IN ATMOSPHERIC-PRESSURE COUNTERFLOW DIFFUSION FLAMES USING PICOSECOND LASER-INDUCED FLUORESCENCE

2001 ◽  
Vol 169 (1) ◽  
pp. 25-43 ◽  
Author(s):  
MICHAEL W. RENFRO ◽  
AMIT CHATURVEDY ◽  
NORMAND M. LAURENDEAU
Keyword(s):  
Atmospheric Pressure ◽  
Diffusion Flames ◽  
Picosecond Laser ◽  
Laser Induced Fluorescence ◽  
Counterflow Diffusion Flames ◽  
Quantitative Measurements

Quantitative measurements of the CH radical in sooting diffusion flames at atmospheric pressure

2003 ◽  
Vol 76 (5) ◽  
pp. 597-602 ◽  
Author(s):  
C. Moreau ◽  
E. Therssen ◽  
P. Desgroux ◽  
J.F. Pauwels ◽  
A. Chapput ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Diffusion Flames ◽  
Quantitative Measurements ◽  
Ch Radical

Spectroscopic Investigation of Atmospheric-Pressure Counterflow Diffusion Flames Inhibited by Halons

1996 ◽  
Vol 50 (1) ◽  
pp. 126-130 ◽  
Author(s):  
K. L. McNesby ◽  
R. G. Daniel ◽  
J. M. Widder ◽  
A. W. Miziolek
Keyword(s):  
Fourier Transform ◽  
Atmospheric Pressure ◽  
Inhibition Efficiency ◽  
Diffusion Flames ◽  
Wide Spectrum ◽  
Combustion Products ◽  
Low Pressure ◽  
Halogenated Hydrocarbons ◽  
Counterflow Diffusion Flames ◽  
Flame Inhibition

Infrared spectra of atmospheric-pressure counterflow diffusion flames inhibited by halons (a contraction of halogenated hydrocarbons) and a few of their potential replacements are measured with the use of Fourier transform spectroscopy. Results are compared to spectra of similar flame systems examined at low pressure. It is shown that, for atmospheric-pressure counterflow diffusion methane/air flames inhibited by CF3Br, CF2H2, and CF4, the two major fluorine-containing combustion products are HF and CF2O. A correlation is shown between flame inhibition efficiency and CF2O formation for atmospheric-pressure counterflow diffusion flames inhibited by these halons. For low-pressure premixed flames inhibited by CF3Br, HF appears to be the only fluorine-containing combustion product, even at relative dopant levels 15 times higher than those capable of extinguishing atmospheric-pressure counterflow diffusion flames. The results of these experiments illustrate the need for flame inhibitant testing over a wide spectrum of flame conditions, while providing further evidence that, for atmospheric-pressure inhibition of real fires by halons, CF2O may be a good indicator of inhibitor efficiency when that inhibition is at least partly accomplished by chemical scavenging of reactive combustion intermediates.

Evaluation of nitric oxide kinetics in high-pressure flames (up to 5 atm)

2003 ◽  
Vol 217 (5) ◽  
pp. 529-536 ◽  
Author(s):  
R. V. Ravikrishna ◽  
N. M. Laurendeau
Keyword(s):  
Nitric Oxide ◽  
High Pressure ◽  
Diffusion Flames ◽  
Chemical Kinetic ◽  
Laser Induced Fluorescence ◽  
Predictive Capability ◽  
Counterflow Diffusion Flames ◽  
Kinetic Mechanisms ◽  
Research Institute

Nitric oxide kinetics in laminar, counterflow diffusion flames at pressures from 1 to 5 atm are assessed by comparing predictions of NO concentration ([NO]) using comprehensive chemical kinetic mechanisms with highly quantitative laser-induced fluorescence (LIF) measurements. The most recent Gas Research Institute (GRI) mechanism, version 3.0, is used and is compared with the older version 2.11 mechanism. Results indicate that there is significant improvement in the predictive capability of the GRI 3.0 mechanism over the 2.11 mechanism with regard to predicting the magnitude of [NO] as well as the trend of [NO] variation with pressure. However, there is still substantial difference between [NO] predictions and measurements, especially at lower pressures, indicating a need for further refinement of NO kinetics.

Sign in / Sign up

Export Citation Format

Share Document