Geodesic
Direct simulation of thermoacoustic instability in gas generators using “CABARET” scheme
Matematičeskoe modelirovanie, Tome 33 (2021) no. 2, pp. 3-19.

Voir la notice de l'article provenant de la source Math-Net.Ru

It is shown that it is possible to use the non-dissipative CABARET scheme to find the conditions for the occurrence of thermoacoustic instability (vibrational combustion) in the combustion chambers of gas turbine engines. The propagation of long waves in the gas-dynamic channel is described quite accurately by a system of quasilinear equations of gas dynamics, averaged over the cross section. Numerical modeling of the dynamics of acoustic disturbances and their interaction with the combustion zone (in the presence of feedbacks) using non-dissipative difference schemes (direct modeling) is a real alternative to the so-called low-order network models that replace the acoustic channel (by analogy with AC power grids) with a sequence of four-port or six-port networks. The advantages of direct modeling include the simple accounting for geometric factors, nonlinear effects, and the possibility of using more realistic combustion models. As an example of using the direct method, a model problem of the excitation of sound vibrations in a tube in the presence of heat sources (Rijke tube) is solved. The results demonstrated the high accuracy of the method in determining the growth rate of unstable modes, comparable to the accuracy of the results obtained using low-order network models.
Keywords: thermal acoustics, balance-characteristic methods, CABARET scheme, Rijke tube.
Mots-clés : vibration combustion 
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     title = {Direct simulation of thermoacoustic instability in gas generators using {{\textquotedblleft}CABARET{\textquotedblright}} scheme},
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N. A. Afanasiev; V. M. Goloviznin; V. N. Semenov; A. M. Sipatov; S. S. Nesterov. Direct simulation of thermoacoustic instability in gas generators using “CABARET” scheme. Matematičeskoe modelirovanie, Tome 33 (2021) no. 2, pp. 3-19. http://geodesic.mathdoc.fr/item/MM_2021_33_2_a0/

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