Experimental characterization of rotating flow field in a model vortex burner

Acoustic techniques, high speed filming and LDA were employed to characterize swirling jet flow in a model vortex burner. The isothermal flow conditions studied correspond to Re = 16,000 and swirl number S = 1, resulting in onset of the swirling jet breakdown. The breakdown zone exhibited distinct f...

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Bibliographic Details
Published in:Experimental thermal and fluid science 2007-07, Vol.31 (7), p.779-788
Main Authors: Shtork, S.I., Cala, C.E., Fernandes, E.C.
Format: Article
Language:English
Subjects:
Applied sciences
BURNERS
Energy
Energy. Thermal use of fuels
ENGINEERING
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Furnaces. Firing chambers. Burners
General. Equipment design. General computation
JETS
LDA
Phase averaged measurements
Precessing vortex core
SPATIAL DISTRIBUTION
Swirl burner
VELOCITY
VORTEX FLOW
VORTICES
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Summary:Acoustic techniques, high speed filming and LDA were employed to characterize swirling jet flow in a model vortex burner. The isothermal flow conditions studied correspond to Re = 16,000 and swirl number S = 1, resulting in onset of the swirling jet breakdown. The breakdown zone exhibited distinct flow unsteadiness in the form of a precessing vortex core (PVC). Phase-averaged analysis of the LDA data was used to reveal an “instantaneous” flow field spatial distribution and to determine the precessing vortex characteristics. These results were compared against the time mean data to reveal the PVC’s footprint in the time-averaged flow structure. In particular, this approach was shown to provide access to the precessing structure parameters making use of conventional flow field diagnostics.
ISSN:0894-1777
1879-2286
DOI:10.1016/j.expthermflusci.2006.08.008