Turbulent Flame Structure of Methane-Hydrogen Mixtures at Elevated Temperature and Pressure

Abstract

The effect of hydrogen addition to methane on premixed turbulent flame has been investigated. Lean, stoichiometric, and rich flames have been tested using a Bunsen burner at 3 bar and 7 bar absolute pressures, and 473 K, 573 K, and 673 K temperatures. Two important turbulent flame structure characterstics, namely flame brush thickness δ _T and flame surface density Σ, have been quantified and analyzed. Coefficients of the equations that relate flame brush thickness with progress variable are deduced. Flame surface density and the Bray–Moss–Libby model coefficient g/(σ _y L _y ) for the fuel mixtures studied have been found.

Keywords:

• Elevated temperature and pressure
• Flame surface density
• Methane–hydrogen mixture
• Premixed turbulent combustion

ACKNOWLEDGMENTS

This research was financed by the European Commission project AFTUR (Alternative Fuels for Gas Turbines, ENK5-CT-2002-00662). The first author thanks EU for sponsoring his research under the Marie Curie programme INECSE (Integrated Energy Conversion for Sustainable Environment, MEST-CT-2005-021018).