ModelingTurbulent Combustion in a CO/H₂ Diffusion Flame Using Reaction Progress Variables

Abstract

A systematically derived model is presented for the turbulent combustion of CO/H₂-air mixtures in diffusion flames with high mixing rates. The mixing of fuel and air is expressed by a mixing variable. The conversion of CO to CO₂, of H₂ to H₂O and of the non-equilibrium intermediate species concentrations are determined by two reaction progress variables. The thermal NO production is calculated in a postprocessing step. In the paper the turbulent source terms in the transport equations for the scalar variables are discussed. A case of a turbulent CO/H₂ diffusion flame with chemical super-equilibrium of intermediate species is presented. The influence of the intermediate species HO₂ an H₂O₂ on the simulated characteristics of the flame is investigated.

Keywords:

• Combustion
• turbulent
• diffusion
• syngas

Additional information

Notes on contributors

J. B.W. KOK

Corresponding author. E-mail: [email protected]. Fax: [phone].