The influence of the flame structure on the combustion oscillations in a cylindrical chamber

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dc.contributor.authorFerreira, Daniel Silva [UNESP]
dc.contributor.authorLacava, Pedro Teixeira
dc.contributor.authorFerreira, Marco Aurélio
dc.contributor.authorDe Carvalho Jr., João Andrade [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionSão José Dos Campos
dc.contributor.institutionCachoeira Paulista
dc.contributor.institutionEnergy Department
dc.contributor.institutionPropulsion Department
dc.contributor.institutionCombustion and Propulsion Associated Laboratory
dc.date.accessioned2014-05-27T11:22:21Z
dc.date.available2014-05-27T11:22:21Z
dc.date.issued2006-12-27
dc.description.abstractAn experimental study has been conducted with the objective of investigating the effects of the flame structure in the combustion oscillation conditions into a laboratorial scale cylindrical chamber. The experiments were conducted in a water-jacketed 1-m long by 25-cm internal diameter stainless steel vertical tube. The combustor operated with liquefied petroleum gas (LPG) in both oscillatory and non oscillatory conditions, under the same input conditions. Part of the reactant mixture was excited acoustically, before the burner exit, by a speaker positioned strategically. The burner was aligned with the chamber longitudinal axis and positioned at its bottom. The experiments were conducted for 0.16 g/s of LPG burning in stoichiometric equivalence ratio. To analyze the flame structure the image tomographic reconstruction process were used, and the resultant images were associated to the oscillatory conditions (frequency and amplitude) into the combustion chamber. The main conclusions were: 1) when the flame premixed condition increase, for example 60% of the total air flow rate is premixed with LPG, the region of intense energy released is close to burner exit and strong amplitudes of oscillation (close to 50 mbar) were obtained into the chamber; 2) for long flames, predominantly diffusive flames, just weak amplitudes were detected, in the spite of the speaker exiting the premixed flow; 3) when the energy is released distributed through the combustion chamber, the long flame acts like a baffle. Copyright © 2006 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.en
dc.description.affiliationUniversidade Estadual Paulista Guaratinguetá, São Paula, 12516-410
dc.description.affiliationInstituto Tecnológico de Aeronáutica São José Dos Campos, São Paulo, 12228-900
dc.description.affiliationInstituto Nacional de Pesquisas Espaciais Cachoeira Paulista, São Paula, 12630-000
dc.description.affiliationEnergy Department
dc.description.affiliationPropulsion Department
dc.description.affiliationCombustion and Propulsion Associated Laboratory
dc.description.affiliationUnespUniversidade Estadual Paulista Guaratinguetá, São Paula, 12516-410
dc.format.extent2706-2715
dc.identifierhttp://dx.doi.org/10.2514/6.2006-2610
dc.identifier.citationCollection of Technical Papers - 12th AIAA/CEAS Aeroacoustics Conference, v. 4, p. 2706-2715.
dc.identifier.doi10.2514/6.2006-2610
dc.identifier.lattes1663295770796752
dc.identifier.scopus2-s2.0-33845599032
dc.identifier.urihttp://hdl.handle.net/11449/69430
dc.language.isoeng
dc.relation.ispartofCollection of Technical Papers - 12th AIAA/CEAS Aeroacoustics Conference
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectCombustion oscillations
dc.subjectFlame structure
dc.subjectNon oscillatory conditions
dc.subjectStoichiometric equivalence ratio
dc.subjectAcoustics
dc.subjectAmplitude modulation
dc.subjectAnechoic chambers
dc.subjectEngine cylinders
dc.subjectLiquefied petroleum gas
dc.subjectOscillations
dc.subjectStainless steel
dc.subjectFlame research
dc.titleThe influence of the flame structure on the combustion oscillations in a cylindrical chamberen
dc.typeTrabalho apresentado em evento
unesp.advisor.lattes1663295770796752

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