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Detalji o izabranom predavanju:
| Seminar: | Seminar za numeričku matematiku i znan. računanje |
| Naziv predavanja: | Nonlinear eigenvalue problems for modeling thermoacoustic instabilities |
| Predavač: | Jonas Moeck (TUB/NTNU), Georg Mensah (TUB), Philip |
| Vrijeme: |
30.11.2017 12:15 |
| Predavaonica: | 104 |
| Tip: |
Gost seminara |
| Opis: | Thermoacoustic instabilities frequently appear in various combustion systems in the form of high-amplitude pressure oscillations. This undesirable dynamic phenomenon originates from the interaction of flame oscillations and the acoustic modes of the combustion chamber. It has been particularly plaguing for the development of high-efficiency, low-emission gas turbine technology. One approach for modeling
thermoacoustic instabilities is based on the Helmholtz equation for acoustic wave propagation, extended with a flame response model. This takes the form of a nonlinear eigenvalue problem that needs to be solved to obtain information about oscillation frequency, stability and
spatial structure of the thermoacoustic modes.
After a general introduction to the topic, we will present some recent work on the application of adjoint perturbation theory to efficiently compute the effect of parameter variations on the spectrum of thermoacoustic systems. This information can then be used for optimization or uncertainty quantification. We will then show the present status of our application of contour-integral methods for the solution of nonlinear eigenproblems in thermoacoustics. |
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