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MODELLING AND SIMULATION OF LEAN PREMIXED TURBULENT METHANE/HYDROGEN/AIR FLAMES FOR TWO FLOW CONFIGURATIONS

DOI: 10.1615/ICHMT.2008.CHT.2070
12 pages

Friedrich Dinkelacker
nstitute of Fluid and Thermodynamics, Universität Siegen, Germany

B. Manickam
Institute of Fluid and Thermodynamics, Universität Siegen Paul-Bonatz-Straße 9-11, 57076 Siegen, Germany

N. K. Aluri
ALSTOM Research Centre, Baden, Switzerland

S. P. R. Muppala
Faculty of Engineering, Kingston University, Friars Avenue, Roehampton Vale, London, SW15 3DW, United Kingdom

Jennifer X. Wen
Faculty of Engineering, Kingston University, Friars Avenue, Roehampton Vale, London, SW15 3DW, United Kingdom; School of Engineering, University of Warwick, Coventry CV4 7AL, UK

Abstrakt

In this study, we have performed RANS simulations to investigate interesting combustion phenomena and quantify the effects of hydrogen addition on flame height and brush thickness for lean methane flames. A combustion model based on the algebraic flame surface wrinkling is used. In this context, two flame configurations of varying complexities, Bunsen-like and dump combustor are considered. The levels of hydrogen doping studied are up to 40 % by volume and pressures up to 9 bar. An effective Lewis number relation for the two-component fuel-air mixture is proposed and incorporated into the reaction model for better quantification of results. For Bunsen-like flames, the RANS-predicted flame position is in satisfactory agreement with the corresponding experimental data. Calculated mean flame position and flame brush thickness for high-pressure, high-turbulence enveloped flames are in good agreement with measurement. It is interesting to note that the variation of brush thickness with turbulent Schmidt number from the progress variable gradient approach is different for the two flames and the results are presented and discussed in the appendix.

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