Intrinsic thermoacoustic modes and their interplay with acoustic modes in a Rijke burner

Hosseini, N.Eindhoven Univ Technol, Mech Engn Dept, POB 513, NL-5600 MB Eindhoven, Netherlands.;Bekaert Combust Technol BV, Assen, Netherlands. (author)

QC 20190108
The interplays between acoustic and intrinsic modes in a model of a Rijke burner are revealed and their influence on the prediction of thermoacoustic instabilities is demonstrated. To this end, the system is examined for a range of time delays, temperature ratios and reflection coefficients as adjustable parameters. A linear acoustic network model is used and all modes with frequency below the cut-on frequency for non-planar acoustic waves are considered. The results show that when reflection coefficients are reduced, the presence of a pure ITA mode limits the reduction in the growth rate that usually results from a reduction of the reflection coefficients. In certain conditions, the growth rates can even increase by decreasing reflections. As the time delay of the flame and thus the ITA frequency decreases, the acoustic modes couple to and subsequently decouple from the pure ITA modes. These effects cause the maximum growth rate to alternate between the modes. This investigation draws a broad picture of acoustic and intrinsic modes, which is crucial to accurate prediction and interpretation of thermoacoustic instabilities.

Kornilov, V. N.Eindhoven Univ Technol, Mech Engn Dept, POB 513, NL-5600 MB Eindhoven, Netherlands. (author)
Lopez Arteaga, InesKTH,Farkost och flyg,Eindhoven Univ Technol, Mech Engn Dept, POB 513, NL-5600 MB Eindhoven, Netherlands(Swepub:kth)u1gy0h8d (author)
Polifke, W.Tech Univ Munich, Mech Engn Dept, Garching, Germany. (author)
Teerling, O. J.Bekaert Combust Technol BV, Assen, Netherlands. (author)
de Goey, L. P. H.Eindhoven Univ Technol, Mech Engn Dept, POB 513, NL-5600 MB Eindhoven, Netherlands. (author)
Eindhoven Univ Technol, Mech Engn Dept, POB 513, NL-5600 MB Eindhoven, Netherlands.;Bekaert Combust Technol BV, Assen, Netherlands.Eindhoven Univ Technol, Mech Engn Dept, POB 513, NL-5600 MB Eindhoven, Netherlands. (creator_code:org_t)

In:International Journal of Spray and Combustion Dynamics: Sage Publications10:4, s. 315-3251756-82771756-8285

By the author/editor: Hosseini, N.; Kornilov, V. N.; Lopez Arteaga, I ...; Polifke, W.; Teerling, O. J.; de Goey, L. P. H ...

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