Flame-sound interaction in tubes with nonslip walls
Artikel i vetenskaplig tidskrift, 2007

Flame interaction with sound is studied for a premixed flame propagating to the closed end of a tube with nonslip walls. The flow geometry is similar to that in the classical Searby experiments on flame-acoustic interaction [Combust. Sci. Technol. 81 (1992) 221]. The problem is solved by direct numerical simulations of the combustion equations. The flame-sound interaction strongly influences oscillations of the flame front. Particularly, sound noticeably increases the oscillation amplitude in comparison with that in an open tube with nonreflecting boundary conditions at the ends studied previously. Oscillations become especially strong in the second part of the tube, where flame pulsations are in resonance with the acoustic wave. Parameters of the flame oscillations are investigated for different values of the tube width and length. It is demonstrated that the oscillations are stronger in wider tubes, though the investigated tube width is limited by the Computational facilities. In sufficiently wide tubes, violent folding of a flame front is observed because of the flame-acoustic resonance. By increasing the Lewis number, one also increases the oscillation amplitude. (C) 2007 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

PREMIXED FLAMES

SHOCK

PROPAGATION

premixed burning

CURVED STATIONARY FLAMES

ACOUSTIC

INSTABILITY

TAYLOR INSTABILITY

ACCELERATION

direct numerical simulations

FLOW

flame-sound interactions

Författare

A. Petchenko

Umeå universitet

V. Bychkov

Umeå universitet

V. Akkerman

Russian Academy of Sciences

Umeå universitet

Lars-Erik Eriksson

Chalmers, Tillämpad mekanik

Combustion and Flame

0010-2180 (ISSN)

Vol. 149 418-434

Ämneskategorier

Maskinteknik

DOI

10.1016/j.combustflame.2007.02.003