Skip to Main content Skip to Navigation
Journal articles

A theoretical study of mean azimuthal flow and asymmetry effects on thermo-acoustic modes in annular combustors

Abstract : The objective of this paper is to develop an analytical model to capture two symmetry breaking effects controlling the frequency and nature (spinning, standing or mixed) of azimuthal modes appearing in annular chambers: (1) Using two different burner types distributed along the chamber (2) Considering the mean azimuthal flow due to the swirlers or to effusion cooling. The ATACAMAC (Analytical Tool to Analyze and Control Azimuthal Modes in Annular Chambers) methodology is applied using the linearized acoustic equations with a steady and uniform azimuthal mean flow. It provides an analytical implicit dispersion relation which can be solved numerically. A fully analytical resolution is possible when the annular chamber is weakly coupled to the burners. Results show that symmetry breaking, either by mixing burners types or with a mean azimuthal flow, splits the azimuthal modes into two waves with different frequencies and structures. Breaking symmetry promotes standing modes but adding even a low azimuthal mean flow fosters spinning modes so that the azimuthal mean flow must be taken into account to study azimuthal modes.
Complete list of metadatas

Cited literature [12 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01116120
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Thursday, February 12, 2015 - 3:36:59 PM
Last modification on : Thursday, June 18, 2020 - 11:25:42 AM
Long-term archiving on: : Wednesday, May 13, 2015 - 10:25:48 AM

File

bauerheim_13529.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Michaël Bauerheim, Michel Cazalens, Thierry Poinsot. A theoretical study of mean azimuthal flow and asymmetry effects on thermo-acoustic modes in annular combustors. Proceedings of the Combustion Institute, Elsevier, 2015, vol. 35 (n° 3), pp. 3219-3227. ⟨10.1016/j.proci.2014.05.053⟩. ⟨hal-01116120⟩

Share

Metrics

Record views

191

Files downloads

408