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

N. Hosseini, V. N. Kornilov, I. Lopez Arteaga, W. Polifke, O. J. Teerling, L. P.H. de Goey

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

11 Citaten (Scopus)
110 Downloads (Pure)

Samenvatting

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.

Originele taal-2Engels
Pagina's (van-tot)315-325
Aantal pagina's11
TijdschriftInternational Journal of Spray and Combustion Dynamics
Volume10
Nummer van het tijdschrift4
DOI's
StatusGepubliceerd - 1 dec 2018

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