Unsteady response of chain-branching premixed-flames to pressure waves

Abstract

Motivated by some recent experimental results that are incompatible with the standard one-step model, we present an analytical study of the unsteady response of flames to acoustic waves in the framework of a simple two-step chemistry model, using conditions that are appropriate to approximately describe lean methane–air flames. The calculated response functions are qualitatively different from those obtained with the standard one-step model. The results are sufficiently encouraging to suggest that the analysis should be extended in the near future to more detailed kinetics schemes.

Keywords:

• one-step model
• pressure waves
• transfer function
• two-step model
• unsteady flame response

Acknowledgments

This work was performed as part of the French ANR project number BLAN07-2-182685.