Effets de la temperature de paroi sur la reponse de la flamme a des oscillations acoustiques
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Effets de la temperature de paroi sur la reponse de la flamme a des oscillations acoustiques Enlace externoen Biblioteca Virtual del Banco de la República
Registro bibliográfico
- Título: Effets de la temperature de paroi sur la reponse de la flamme a des oscillations acoustiques
- Autor: Mejía Mejía, Daniel Augusto
- Publicación original: 2014
- Descripción física: PDF
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Nota general:
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Combustion instabilities, induced by the resonant coupling of acoustics and combustion occur in many practical systems such as domestic boilers, gas turbine and rocket engines. They produce pressure and heat release fluctuations that in some extreme cases can provoke mechanical failure or catastrophic damage. These phenomena have been extensively studied in the past, and the basic driving and coupling mechanisms have already been identified. However, it is well known that most systems behave differently at cold start and in the permanent regime and the coupling between the temperature of the solid material and combustion instabilities still remains unclear. The aim of this thesis is to study this mechanism.
This work presents an experimental investigation of combustion instabilities for a laminar premixed flame stabilized on a slot burner with controlled wall temperature. For certain operating conditions, the system exhibits a combustion instability locked on the Helmholtz mode of the burner. It is shown that this instability can be controlled and even suppressed by changing solely the temperature of the burner rim.
A linear stability analysis is used to identify the parameters playing a role in the resonant coupling and retrieves the features observed experimentally. Detailed experimental studies of the different elementary processes involved in the thermo-acoustic coupling are used to evaluate the sensitivity of these parameters to the wall temperature. Finally a theoretical model of unsteady heat transfer from the flame root to the burner-rim and detailed experimental measurements permit to establish the physical mechanism for the temperature dependance on the flame response.
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Combustion instabilities, induced by the resonant coupling of acoustics and combustion occur in many practical systems such as domestic boilers, gas turbine and rocket engines. They produce pressure and heat release fluctuations that in some extreme cases can provoke mechanical failure or catastrophic damage. These phenomena have been extensively studied in the past, and the basic driving and coupling mechanisms have already been identified. However, it is well known that most systems behave differently at cold start and in the permanent regime and the coupling between the temperature of the solid material and combustion instabilities still remains unclear. The aim of this thesis is to study this mechanism.
- Notas de reproducción original: Digitalización realizada por la Biblioteca Virtual del Banco de la República (Colombia)
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Notas:
- Resumen: Acoustics; Combustion instability; Flame dynamics; Flame transfer function; Unsteady heat transfer
- © Derechos reservados del autor
- Colfuturo
- Forma/género: tesis
- Idioma: inglés
- Institución origen: Biblioteca Virtual del Banco de la República
- Encabezamiento de materia:
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