Intrinsic instability of flame-acoustic coupling
2014 (English)In: Combustion and Flame, ISSN 0010-2180, E-ISSN 1556-2921, Vol. 161, no 11, 2860-2867 p.Article in journal (Refereed) Published
This paper shows that a flame can be an intrinsically unstable acoustic element. The finding is clarified in the framework of an acoustic network model, where the flame is described by an acoustic scattering matrix. The instability of the flame acoustic coupling is shown to become dominating in the limit of no acoustic reflections. This is in contrast to classical standing-wave thermoacoustic modes, which originate from the positive feedback loop between system acoustics and the flame. These findings imply that the effectiveness of passive thermoacoustic damping devices is limited by the intrinsic stability properties of the flame.
Place, publisher, year, edition, pages
2014. Vol. 161, no 11, 2860-2867 p.
Thermoacoustics, Intrinsic flame instability, Flame instability, Acoustics, Combustion instabilities
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-156105DOI: 10.1016/j.combustflame.2014.05.009ISI: 000343380000010ScopusID: 2-s2.0-84926277042OAI: oai:DiVA.org:kth-156105DiVA: diva2:778127
QC 201501092015-01-092014-11-212015-01-09Bibliographically approved