dorsal/arxiv
View SchemaCharacterization and diagnostics of combustion thermoacoustic instabilities using nonlinear dynamics and topological methods
| Authors | G. Gianni, G. Mariotti, E. Paganini, S. Sello |
|---|---|
| Categories | |
| ArXiv ID | physics/0306199 |
| URL | https://arxiv.org/abs/physics/0306199 |
Abstract
The onset of thermoacoustic instabilities in lean-premixed gas-turbine combustors is a crucial problem leading to degradation in engine and emissions performance and shortened component life. The main aim of this study is to propose a methodology based both on concepts of nonlinear dynamics and on geometric-topological invariants, for the characterization of attractors related to measurements based on the flame spontaneous light emission, like OH* radical, in order to classify different phases of the combustion process and to better recognize the transition mechanisms leading to the thermoacoustic instabilities. Preliminary results, clearly show the powerfulness of the approach to show the dynamical evolution of the flame and to evidence the onset of the thermoacoustic instabilities: in particular the topological invariant index (genus and related quantities) appear s as the best candidate for an early indicator of the dynamical transition, characterized by the onset of a more persistent, low entropy torus (quasi-periodic motion), as the related thermoacoustic attractor.
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"abstract": "The onset of thermoacoustic instabilities in lean-premixed gas-turbine\ncombustors is a crucial problem leading to degradation in engine and emissions\nperformance and shortened component life. The main aim of this study is to\npropose a methodology based both on concepts of nonlinear dynamics and on\ngeometric-topological invariants, for the characterization of attractors\nrelated to measurements based on the flame spontaneous light emission, like OH*\nradical, in order to classify different phases of the combustion process and to\nbetter recognize the transition mechanisms leading to the thermoacoustic\ninstabilities. Preliminary results, clearly show the powerfulness of the\napproach to show the dynamical evolution of the flame and to evidence the onset\nof the thermoacoustic instabilities: in particular the topological invariant\nindex (genus and related quantities) appear s as the best candidate for an\nearly indicator of the dynamical transition, characterized by the onset of a\nmore persistent, low entropy torus (quasi-periodic motion), as the related\nthermoacoustic attractor.",
"arxiv_id": "physics/0306199",
"authors": [
"G. Gianni",
"G. Mariotti",
"E. Paganini",
"S. Sello"
],
"categories": [
"physics.data-an",
"physics.flu-dyn"
],
"title": "Characterization and diagnostics of combustion thermoacoustic instabilities using nonlinear dynamics and topological methods",
"url": "https://arxiv.org/abs/physics/0306199"
},
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