Affiliation:
1. Lomonosov Moscow State University
Abstract
Stability of the gas flows generated by steady near-limit flames propagating in vertical tubes is studied
numerically. Basic scenarios of the burnt gas flow evolution are identified in relation to the thermal gas
expansion parameter and the normal flame speed. It is shown that the realization of specific scenario essentially
depends on the stagnation zone width as well as on the distance travelled by the gas from the flame front
to the tube end. In particular, it is found that for sufficiently short distances, the burnt gas flows are stable
provided that the stagnation zone width is less than half the tube diameter. Otherwise, an unstable flow
evolution can lead to the appearance of recirculation domains and acoustic perturbations.