Detailed computer modeling of a premixed laminar carbon monoxide/hydrogen flame

1992 ◽  
Vol 96 (2) ◽  
pp. 690-696 ◽  
Author(s):  
Jim O. Olsson ◽  
Ingrid B. M. Olsson
Keyword(s):  
Carbon Monoxide ◽  
Computer Modeling ◽  
Hydrogen Flame ◽  
Premixed Laminar ◽  
Detailed Computer

STUDY OF LIGHT INDUCED CHANGES IN a-Si:H BY DETAILED COMPUTER MODELING OF ADMITTANCE AND DLTS

1981 ◽  
Vol 42 (C4) ◽  
pp. C4-371-C4-374 ◽  
Author(s):  
J. D. Cohen ◽  
D. V. Lang ◽  
J. P. Harbison ◽  
A. M. Sergent
Keyword(s):  
Computer Modeling ◽  
Detailed Computer ◽  
Induced Changes

Computer modeling of a premixed laminar formaldehyde flame

1989 ◽  
Vol 93 (8) ◽  
pp. 3107-3112 ◽  
Author(s):  
Jim O. Olsson ◽  
Ingrid B. M. Olsson ◽  
Mitchell D. Smooke
Keyword(s):  
Computer Modeling ◽  
Premixed Laminar

Laser-Induced Intermodulated Flame Fluorescence: A New Approach to Scattering Correction in Analytical Atomic Fluorescence

1984 ◽  
Vol 38 (5) ◽  
pp. 619-624 ◽  
Author(s):  
N. Omenetto ◽  
L. P. Hart ◽  
J. D. Winefordner
Keyword(s):  
Fluorescence Signal ◽  
Scattering Problems ◽  
Atomic Fluorescence ◽  
Spatially Resolved ◽  
Combustion Diagnostics ◽  
Scattering Correction ◽  
Hydrogen Flame ◽  
Modulation Signal ◽  
Premixed Laminar ◽  
Saturation Effects

It is shown that the technique of intermodulated fluorescence can effectively correct for scattering problems in analytical flame fluorescence spectroscopy. When two laser beams, amplitude-modulated at different frequencies f1 and f2 and counterpropagated colinearly throughout an atomizer, are tuned to the absorption transition of the element of interest, non-linear mixing of the fluorescence signal results, due to saturation effects. By extraction of the signal at the sum or difference frequency, f2 ± f2, the linear scattering component of the spectrum can be essentially eliminated. This has been demonstrated for a sodium solution nebulized in a premixed, laminar, argon-oxygen-hydrogen flame. Because the modulation signal can be observed only at the intersection volume between the two beams, this technique constitutes a powerful tool for spatially resolved combustion diagnostics.

scholarly journals Continuous spectra inflames: the role of atomic oxygen in combustion

1944 ◽  
Vol 183 (992) ◽  
pp. 111-124 ◽  
Keyword(s):  
Nitric Oxide ◽  
Carbon Monoxide ◽  
Atomic Oxygen ◽  
Green Emission ◽  
Combustion Mechanism ◽  
Oxides Of Nitrogen ◽  
High Concentration ◽  
Hydrocarbon Flames ◽  
Hydrogen Flame

The causes and types of continuous spectra emitted by flames are discussed and their importance stressed. It is shown that the yellow-green continuous spectrum emitted by some flames containing oxides of nitrogen is probably identical with the spectrum of the air after glow and is therefore due to a reaction between nitric oxide and atomic oxygen. It thus becomes possible to test for the presence of atomic oxygen in a flame by admitting nitric oxide and observing if a yellow-green emission results. For the carbon monoxide flame there appears to be a high concentration of atomic oxygen, both for the dry and moist flame. The combustion mechanism is discussed in detail using this knowledge. For the hydrogen flame a little atomic oxygen is present, but results do not permit of definite conclusions. For hydrocarbon flames there is no sign of atomic oxygen in the inner cone, and this is taken as strong evidence in favour of a peroxidation rather than a bydroxylation mechanism .

scholarly journals Flame spectra in the photographic infra-red

1942 ◽  
Vol 181 (985) ◽  
pp. 197-209 ◽  
Keyword(s):  
Carbon Monoxide ◽  
Nitrous Oxide ◽  
Band Structure ◽  
Strong Emission ◽  
Infra Red ◽  
Hydrogen Flame ◽  
Vibration Rotation ◽  
Combustion Processes ◽  
Rotation Spectrum ◽  
Α Band

The spectra of the flames of hydrogen, methane and carbon monoxide burning with oxygen and with nitrous oxide have been photographed in the region 6000-10,000 A. All flames in which water is a final product show a system of emission bands from the red to the far infra-red, the bands increasing in strength to longer wave-lengths. Outstanding heads have been observed at λλ6165, 6457, 6919, 7164, 8097, 8916, 9277 and 9669. It is shown that these bands are due to the vibration-rotation spectrum of H 2 O. The top of a flame of oxygen burning in hydrogen is coloured red by the emission of these bands. In the hydrogen flame the bands are probably excited mainly thermally, but the strength of these same H 2 O bands in the flame of moist carbon monoxide indicates that in this flame the excitation is a result of the combustion processes; this agrees with earlier theories on the formation of vibrationally activated molecules of CO 2 in this flame. In the hydrogen—nitrous-oxide flame new band structure in the infra-red is provisionally assigned to an extension of the ammonia α band. The methane—nitrous-oxide flame also shows the ammonia a band, and in addition strong emission of the red system of CN.

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