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Impact of CO2/N2/Ar Addition on the Internal Structure and Stability of Nonpremixed CH4/Air Flames at Lifting

Abstract : The authors focused on how adding CO2 to the air influences the transition from an attached flame to a lifted flame issued from a coaxial nonpremixed methane-air jet. To discriminate between effects due to a diluent (dilution, thermal, or chemical impacts), chemically and thermally inert N2 and chemically inert Ar were also investigated. Flame lifting always occurs, essentially controlled by the critical flow-rate ratio, (Qdiluent/Qair)lifting. CO2 has the strongest ability to break flame stability, followed by N2, then by Ar. A unique attachment height and OH thickness characterize lifting for all the diluents; lifting is attained once the same critical flame edge propagation speed is reached. (Qdiluent/Qair)/(Qdiluent/Qair)lifting is the affine parameter of similarity laws describing Ha and EpOH evolutions with dilution. Aerodynamics competes with dilution to impose lifting and boundary effects cannot be ignored in a fine analysis. The flame behaves differently according to whether lifting results from aerodynamics or dilution.
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Submitted on : Tuesday, March 4, 2014 - 10:05:09 AM
Last modification on : Tuesday, October 19, 2021 - 4:14:03 PM

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Jiesheng Min, Françoise Baillot, Aurélie Wyzgolik, Eric Domingues, Martine Talbaut, et al.. Impact of CO2/N2/Ar Addition on the Internal Structure and Stability of Nonpremixed CH4/Air Flames at Lifting. Combustion Science and Technology, Taylor & Francis, 2010, 182 (11-12), pp.1782-1804. ⟨10.1080/00102202.2010.499716⟩. ⟨hal-00955214⟩

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