Wall-temperature effects on flame response to acoustic oscillations

Daniel Mejia (1) , Laurent Selle (1) , Rudy Bazile (1) , Thierry Poinsot (1)

1 IMFT - Institut de mécanique des fluides de Toulouse

This paper presents an experimental investigation of combustion instabilities for a laminar premixed flame stabilized on a slot burner. For certain operating conditions, the system exhibits an unstable mode locked on the Helmholtz mode of the burner. It is shown that the instability can be controlled and even suppressed by changing solely the temperature of the burner rim. A theoretical model accounting for this parameter in the flame transfer function is devised and the physical mechanisms for the temperature dependance of the flame response are investigated.

Mots clés: Combustion instabilities; Flame transfer function; Wall temperature

Domaines: Mécanique des fluides [physics.class-ph]

Daniel Mejia, Laurent Selle, Rudy Bazile, Thierry Poinsot. Wall-temperature effects on flame response to acoustic oscillations. Proceedings of the Combustion Institute, 2015, vol. 35 (n° 3), pp.3201-3208. ⟨10.1016/j.proci.2014.07.015⟩. ⟨hal-01116177⟩