Effect of fuel type on equivalence ratio measurements using chemiluminescence in premixed flames

Mikaël Orain; Yannis Hardalupas

doi:10.1016/j.crme.2010.05.002

Effect of fuel type on equivalence ratio measurements using chemiluminescence in premixed flames
[Influence du combustible sur la mesure de richesse par chimiluminescence dans les flammes prémélangées]

Mikaël Orain ¹ ; Yannis Hardalupas ²

¹ Office national d'études et de recherches aérospatiales, chemin de la Hunière, 91761 Palaiseau, France
² Imperial College London, Exhibition road, SW7 2AZ London, UK

Comptes Rendus. Mécanique, Volume 338 (2010) no. 5, pp. 241-254.

Résumé
Abstract

Des mesures locales et résolues en temps de l'intensité de chimiluminescence des radicaux OH^∗, CH^∗ et C^∗₂ ont été réalisées dans des flammes à contre-courant alimentées par du propane ou des combustibles prévaporisés (isooctane, éthanol, méthanol) pour différents taux d'étirement et différentes richesses. Les résultats quantifient indépendamment l'influence du combustible, du taux d'étirement et de la richesse sur les émissions de chimiluminescence des flammes. La capacité de l'intensité de chimiluminescence à décrire le taux de dégagement de chaleur dépend fortement de la nature du combustible. Le rapport d'intensité OH^∗/CH^∗ décroit de façon monotone avec la richesse pour tous les combustibles et peut être utilisé pour mesurer la richesse du mélange réactif. Pour le propane et l'isooctane, le rapport OH^∗/CH^∗ est indépendant du taux d'étirement de la flamme, alors qu'une dépendance est observée pour l'éthanol et le méthanol.

Local temporally-resolved measurements of chemiluminescent intensity from OH^∗, CH^∗ and C^∗₂ radicals were obtained in premixed counterflow flames operating with propane and prevaporised fuels (isooctane, ethanol and methanol), for different equivalence ratios and strain rates. The results quantified independently the effects of fuel type, strain rate and equivalence ratio on chemiluminescent emissions from flames. The ability of chemiluminescent intensity from OH^∗, CH^∗ and C^∗₂ radicals to indicate heat release rate depends strongly on fuel type. The intensity ratio OH^∗/CH^∗ has a monotonic decrease with equivalence ratio for all fuels and can be used to measure equivalence ratio of the reacting mixture. For propane and isooctane, the OH^∗/CH^∗ ratio remains independent of flame strain rate, whereas some dependence is observed for ethanol and methanol.

Reçu le : 2009-10-19
Accepté le : 2010-05-27
Publié le : 2010-05-01

DOI : 10.1016/j.crme.2010.05.002

Keywords: Combustion, Equivalence ratio, Chemiluminescence, Heat release, Premixed flames, Fuel type
Mot clés : Combustion, Richesse, Chimiluminescence, Dégagement de chaleur, Flammes prémélangées, Type de combustible

Affiliations des auteurs :

Mikaël Orain ¹ ; Yannis Hardalupas ²

¹ Office national d'études et de recherches aérospatiales, chemin de la Hunière, 91761 Palaiseau, France
² Imperial College London, Exhibition road, SW7 2AZ London, UK

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     title = {Effect of fuel type on equivalence ratio measurements using chemiluminescence in premixed flames},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {241--254},
     publisher = {Elsevier},
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     number = {5},
     year = {2010},
     doi = {10.1016/j.crme.2010.05.002},
     language = {en},
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Mikaël Orain; Yannis Hardalupas. Effect of fuel type on equivalence ratio measurements using chemiluminescence in premixed flames. Comptes Rendus. Mécanique, Volume 338 (2010) no. 5, pp. 241-254. doi : 10.1016/j.crme.2010.05.002. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2010.05.002/

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