Título: | EXPERIMENTAL STUDY OF THE TURBULENT COMBUSTION OF ETHANOL SPRAYS USING OH-PLIF, PIV AND SHADOWGRAPHY | ||||||||||||||||||||||||||||||||||||
Autor: |
JUAN JOSE CRUZ VILLANUEVA |
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Colaborador(es): |
LUIS FERNANDO FIGUEIRA DA SILVA - Orientador |
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Catalogação: | 20/AGO/2014 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||||||||||||||||||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=23360&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=23360&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.23360 | ||||||||||||||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||||||||||||||
This work presents an experimental analysis of turbulent combustion of ethanol sprays through the use of laser diagnostic techniques in a bluff-body burner. Are employed the planar laser-induced fluorescence (PLIF) of the hydroxyl (OH), to map the flame front, the particle image velocimetry (PIV) to determine the velocity field of the spray droplets and Shadowgraphy to obtain the droplet diameter and velocity. A characterization of the structure of the air flow downstream of the bluff-body is performed with stereo PIV at different Reynolds numbers. The results evidence flow similarity in the recirculation zone. The largest turbulent velocity fluctuations are found in the vortex region, which implies the anisotropy of the Reynolds stresses. The results of Shadowgraphy indicate that the spray droplets are not perfectly spherical near the atomizer. The evolution of Sauter mean diameter (SMD) is measured at various positions at the recirculation region. The largest diameter droplets have the highest velocity and the smaller are slightly deviated by recirculation zone in the far furthest from the centerline. The reactive experiments are performed with different ethanol and air flow rates and indicate that the flame front is detached from the burner, the shape is determined by the ethanol flow rate and the luminescence intensity increases with the air velocity. In some case the air flow changes the shape of the spray. An appreciable number of droplets always passe through the flame front. The velocity of the droplets is influenced by the increase of speed air velocity.
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