Uittreksel
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-2 | Engels |
|---|---|
| Pagina's (van-tot) | 315-325 |
| Aantal pagina's | 11 |
| Tijdschrift | International Journal of Spray and Combustion Dynamics |
| Volume | 10 |
| Nummer van het tijdschrift | 4 |
| DOI's | |
| Status | Gepubliceerd - 1 dec 2018 |
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Intrinsic thermoacoustic modes and their interplay with acoustic modes in a Rijke burner. / Hosseini, N.; Kornilov, V. N.; Lopez Arteaga, I.; Polifke, W.; Teerling, O. J.; de Goey, L. P.H.
In: International Journal of Spray and Combustion Dynamics, Vol. 10, Nr. 4, 01.12.2018, blz. 315-325.Onderzoeksoutput: Bijdrage aan tijdschrift › Tijdschriftartikel › Academic › peer review
TY - JOUR
T1 - Intrinsic thermoacoustic modes and their interplay with acoustic modes in a Rijke burner
AU - Hosseini, N.
AU - Kornilov, V. N.
AU - Lopez Arteaga, I.
AU - Polifke, W.
AU - Teerling, O. J.
AU - de Goey, L. P.H.
PY - 2018/12/1
Y1 - 2018/12/1
N2 - 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.
AB - 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.
KW - acoustic mode
KW - Intrinsic thermoacoustic instability
KW - ITA mode
KW - network model
KW - Rijke burner
UR - http://www.scopus.com/inward/record.url?scp=85058561681&partnerID=8YFLogxK
U2 - 10.1177/1756827718782884
DO - 10.1177/1756827718782884
M3 - Article
AN - SCOPUS:85058561681
VL - 10
SP - 315
EP - 325
JO - International Journal of Spray and Combustion Dynamics
JF - International Journal of Spray and Combustion Dynamics
SN - 1756-8277
IS - 4
ER -