The reduced kinetic description of lean premixed combustion

Sánchez Pérez, Antonio Luis and Lépinette, Alain and Bollig, M. and Liñán Martínez, Amable and Lázaro Gómez, Benigno (2000). The reduced kinetic description of lean premixed combustion. "Combustion and Flame", v. 123 (n. 4); pp. 436-464. ISSN 0010-2180.


Title: The reduced kinetic description of lean premixed combustion
  • Sánchez Pérez, Antonio Luis
  • Lépinette, Alain
  • Bollig, M.
  • Liñán Martínez, Amable
  • Lázaro Gómez, Benigno
Item Type: Article
Título de Revista/Publicación: Combustion and Flame
Date: December 2000
Volume: 123
Freetext Keywords: Combustion; Premixed flame; Methane; Oxidation; Pollutant emission; Carbon monoxide; Nitric oxide; Lean mixture; Combustion velocity; Flame structure; Flamme premelange; Oxydation; Emission polluant; Carbone monoxyde; Azote monoxyde; Melange pauvre; Vitesse combustion; Structure flamme; Llama premezcla; Metano; Oxidacion; Emision contaminante; Carbono monoxido; Nitrogeno monoxido; Mezcla pobre; Velocidad combustion; Estructura llama; Thermal use of fuels; Energy; Applied sciences; Utilisation thermique des combustibles; Energie; Sciences appliquees; Utilizacion termica de los combustibles; Energia; Ciencias aplicadas
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Motopropulsión y Termofluidodinámica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Lean premixed methane-air flames are investigated in an effort to facilitate the numerical description of CO and NO emissions in LP (lean premixed) and LPP (lean premixed prevaporized) combustion systems. As an initial step, the detailed mechanism describing the fuel oxidation process is reduced to a four-step description that employs CO, H2, and OH as intermediates not following a steady-state approximation. It is seen that, under conditions typical of gas-turbine combustion, this mechanism can be further simplified to give a two-step reduced description, in which fuel is consumed and CO is produced according to the fast overall step CH4 + 3/2 O2 CO + 2H2O, while CO is slowly oxidized according to the overall step CO + 1/2 O2 CO2. Because of its associated fast rate, fuel consumption takes place in a thin layer where CO, H2, and OH are all out of steady state, while CO oxidation occurs downstream in a distributed manner in a region where CO is the only intermediate not in steady state. In the proposed description, the rate of fuel consumption is assigned a heuristic Arrhenius dependence that adequately reproduces laminar burning velocities, whereas the rate of CO oxidation is extracted from the reduced chemistry analysis. Comparisons with results obtained with detailed chemistry indicate that the proposed kinetic description not only reproduces well the structure of one-dimensional unstrained and strained flames, including profiles of CO, temperature, and radicals, but can also be used to calculate NO emissions by appending an appropriate one-step reduced chemistry description that includes both the thermal and the N2O production paths. Although methane is employed in the present study as a model fuel, the universal structure of the resulting CO oxidation region, independent of the fuel considered, enables the proposed formulation to be readily extended to other hydrocarbons.

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Item ID: 841
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Deposited by: Archivo Digital UPM
Deposited on: 24 Apr 2009
Last Modified: 20 Apr 2016 06:33
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