The mechanism of interaction between a combustion region and acoustic resonator

Abstract This paper is intended to explain the mechanism of vibrations in a combustion chamber, appearing during the interaction of the turbulent flame and the acoustic resonator. The combustion chamber together with the resonator forms a self-sustained vibrating system, including a source of energy located within the flame, a mechanism controlling the energy release connected with the change of flame structure during vibrations, and a feedback consisting in the influence of acoustic vibrations on the change of the flame structure. The experimental results obtained for a fully developed turbulent flame showed that the combustion instability was closely related to the type of fuel and the composition of the fuel-air mixture. Though the combustion process proceeds according to the distributed volume reaction model, the combustion instability occurs exactly for fuel-air mixture characterized by cellular flame structure of laminar flames.