Flame balls dynamics in divergent channel

Abstract

A three-dimensional reaction-diffusion model for lean low-Lewis-number premixed flames with radiative heat losses propagating in divergent channel is studied numerically. Effects of inlet gas velocity and heat-loss intensity on flame structure at low Lewis numbers are investigated. It is found that continuous flame front exists at small heat losses and the separate flame balls settled within restricted domain inside the divergent channel at large heat losses. It is shown that the time averaged flame balls coordinate may be considered as important characteristic analogous to coordinate of continuous flame stabilized in divergent channel.

Keywords:

• premixed cellular flames
• heat losses
• flame balls, thermal-diffusion instability
• divergent channel

Acknowledgements

The authors thank Prof. K. Maruta for fruitful discussions. This research was partially supported by grants of SB RAS No. 116 and Collaborative research project of Tohoku University.