Absolute CH concentration measurements in low-pressure methane flames: comparisons with model results

Berg, Pamela A.; Hill, Deborah A.; Noble, Alison; Smith, Gregory P.; Jeffries, Jay B.; Crosley, David R.

doi:10.1016/s0010-2180(99)00130-3

Cited by 81 publications

(61 citation statements)

References 18 publications

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“…And the reaction mechanism is GRI-Mech 3.0, which comprises 53 chemical species and 325 temperature and pressure-dependent reactions (plus their reverse rates). A number of studies have proved that results from CHEMKIN are in good agreements with experimental ones (3), (15), (25) , hence this paper does not continue the confirmation. The fluorescence signal from both chemical reaction and excited laser may be expressed as (22) :…”

Section: Fig 4 Experimental Sequence 24 Experimental Conditions Andmentioning

confidence: 55%

“…The number density is normalized by 2.66Χ10 15 cm -3 , which is the maximum value. The maximum number density varied greatly in different literatures for CH 4 /air flame: the maximum OH number density is 1.8Χ10 16 cm -3 in (27) , 3.0Χ10 14 in (28), 1.5Χ10 15 in (25) . From the data mentioned above, we can get that C=1.529Χ10 -2 cm 2 s -1 .…”

Section: Fig 4 Experimental Sequence 24 Experimental Conditions Andmentioning

confidence: 97%

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Chemiluminescence Measurements of Laminar Premixed Ethylene/Air Flame at Low Pressure

Tan

Zeng

Wang

2012

JTST

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Ethylene plays an important role in regenerative-cooling scramjet engine, but its combustion characteristics have not yet been studied thoroughly. This paper reports the design of a square flat flame burner used for chemiluminescence measurement technique and the concentration of OH* and CH* of laminar premixed ethylene/air flame at low pressure. An approach of obtaining quantitative concentration through both PLIF experiments and CHEMKIN simulations is proposed. Results show that the maximum concentration is about 10 8 cm -3 and increases with elevated pressure.Although the maximum concentration depends much on equivalence ratio and pressure, the ratio of the maximum CH*/OH* concentration is independent of pressure (10kPa~50kPa). The results are prerequisite for employing chemiluminescence technique in ethylene combustion process.

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Section: Fig 4 Experimental Sequence 24 Experimental Conditions Andmentioning

confidence: 55%

Section: Fig 4 Experimental Sequence 24 Experimental Conditions Andmentioning

confidence: 97%

Chemiluminescence Measurements of Laminar Premixed Ethylene/Air Flame at Low Pressure

Tan

Zeng

Wang

2012

JTST

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“…The constants k f and k r are forward and reverse reaction rate constants of the chemical reaction. We simulated the chemical reactions by using the chemical reaction scheme of GRI Mech, 5 which is frequently used in combustion chemistry (e.g., Berg et al 2000) and is applied to impact shock chemistry (Ishimaru et al 2010), combined with chemical schemes of shock-induced pyrolyses of CH 4 (Hidaka et al 1999) and NH 3 (Davidson et al 1990). Equations (4)-(8) are integrated numerically using a finitedifference algorithm described by Shapiro & Kang (1987).…”

Section: Methodsmentioning

confidence: 99%

OXIDIZING PROTO-ATMOSPHERE ON TITAN: CONSTRAINT FROM N₂FORMATION BY IMPACT SHOCK

Ishimaru¹,

Sekine²,

Matsui³

et al. 2011

ApJ

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Titan is the only satellite that possesses a thick atmosphere, composed mainly of N 2 and CH 4 . However, its origin and evolution remain largely unknown. Knowledge of the acquirement of a N 2 atmosphere on Titan would provide insights into nitrogen evolution in planetary atmospheres as well as the formation of satellite systems around gas giants. Previous studies have proposed that the atmospheric N 2 would have been converted from NH 3 via shock heating by accreting satellitesimals in the highly reducing proto-atmosphere composed of NH 3 and CH 4 . Nevertheless, the validity of this mechanism strongly depends on both the composition of the proto-atmosphere and kinetics of shock chemistry. Here, we show that a CO 2 -rich oxidizing proto-atmosphere is necessary to form N 2 from NH 3 efficiently by atmospheric shock heating. Efficient shock production of N 2 is inhibited in a reducing protoatmosphere composed of NH 3 and CH 4 , because CH 4 plays as the coolant gas owing to its large heat capacity. Our calculations show that the amount of N 2 produced in a CO 2 -rich proto-atmosphere could have reached ∼20 times that on the present Titan. Although further quantitative analysis are required (especially, the occurrence of catalytic reactions), our results imply that the chemical composition of satellitesimals that formed the Saturnian system is required to be oxidizing if the current atmospheric N 2 is derived from the shock heating in the proto-atmosphere during accretion. This supports the formation of regular satellites in an actively supplied circumplanetary disk using CO 2 -rich materials originated from the solar nebula at the final stage of gas giant formation.

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“…A filter wheel was set in front of the camera allowing to rapidly changing the filter. Three band pass filters were used: a 431 nm (10 FWHM) to CH* spontaneous emission measurements in order to identify the reaction zone of the flame [19], a 660 nm (10 FWHM) and a 800 nm (10 FWHM) for flame emissions to evaluate the local soot temperature based on the two-color pyrometry principle. A PENTAX f/1.4 12-mm focal length lens was mounted on each camera focused at the burner plane of symmetry.…”

Section: Optical Arrangementmentioning

confidence: 99%

Effects of oxygen index on soot production and temperature in an ethylene inverse diffusion flame

Escudero

Fuentes

Demarco

et al. 2016

Experimental Thermal and Fluid Science

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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Effects of oxygen index on soot production and temperature in an ethylene inverse diffusion flame Escudero, F.; Fuentes, A.; Demarco, R.; Consalvi, J.-L.; Liu, F.; ElicerCortés, J. C.; Fernandez-Pello, C.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions?Contact the NRC Publications Archive team at PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1016/j.expthermflusci.2015.09.029Experimental Thermal and Fluid Science, 2015-10-01 Accepted ManuscriptEffects of oxygen index on soot production and temperature in an ethylene inverse diffusion flameS0894-1777 (15) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. EFFECTS OF OXYGEN INDEX ON SOOT AbstractAn experimental study was conducted to investigate the effects of the Oxygen Index (OI) in an ethylene laminar inverse diffusion flame (IDF). The OI was varied from 21% to 37% and its influence was measured in terms of the flame height, soot volume fraction, soot temperature and radiant fraction. The stoichiometric flame height was measured by the spontaneous emission of CH* radicals and was found to decrease ...

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Absolute CH concentration measurements in low-pressure methane flames: comparisons with model results

Cited by 81 publications

References 18 publications

Chemiluminescence Measurements of Laminar Premixed Ethylene/Air Flame at Low Pressure

Chemiluminescence Measurements of Laminar Premixed Ethylene/Air Flame at Low Pressure

OXIDIZING PROTO-ATMOSPHERE ON TITAN: CONSTRAINT FROM N₂FORMATION BY IMPACT SHOCK

Effects of oxygen index on soot production and temperature in an ethylene inverse diffusion flame

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Absolute CH concentration measurements in low-pressure methane flames: comparisons with model results

Cited by 81 publications

References 18 publications

Chemiluminescence Measurements of Laminar Premixed Ethylene/Air Flame at Low Pressure

Chemiluminescence Measurements of Laminar Premixed Ethylene/Air Flame at Low Pressure

OXIDIZING PROTO-ATMOSPHERE ON TITAN: CONSTRAINT FROM N2FORMATION BY IMPACT SHOCK

Effects of oxygen index on soot production and temperature in an ethylene inverse diffusion flame

Contact Info

Product

Resources

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OXIDIZING PROTO-ATMOSPHERE ON TITAN: CONSTRAINT FROM N₂FORMATION BY IMPACT SHOCK