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Experimental investigation of the vortex breakdown in a lean premixing prevaporizing burner

Published online by Cambridge University Press:  04 March 2015

E. Canepa ,
A. Cattanei ,
D. Lengani ,
M. Ubaldi  and
P. Zunino
E. Canepa*
Affiliation:
DIME, Universitá degli Studi di Genova, Genoa, I-16145, Italy
A. Cattanei
Affiliation:
DIME, Universitá degli Studi di Genova, Genoa, I-16145, Italy
D. Lengani
Affiliation:
DIME, Universitá degli Studi di Genova, Genoa, I-16145, Italy
M. Ubaldi
Affiliation:
DIME, Universitá degli Studi di Genova, Genoa, I-16145, Italy
P. Zunino
Affiliation:
DIME, Universitá degli Studi di Genova, Genoa, I-16145, Italy
*
†Email address for correspondence: [email protected]
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Abstract

The spiral vortex breakdown has been experimentally studied in the flow field generated by a lean premixing prevaporizing (LPP) combustor model. The vortex breakdown structures are characterized by a solid-body rotation. Hence, phase-locked laser Doppler velocimeter measurements, performed in a meridional plane, have allowed reconstruction of the periodic velocity and Reynolds stress fields within a time period and in a relative cylindrical frame of reference. Then, the turbulent kinetic energy (TKE) production term has been computed. The velocity distribution analysis indicates that a spiral vortex core wraps around an inner reverse flow zone. Both are characterized by a precessing motion. Then, the main contributions to the TKE production have been identified together with their spatial locations. Their distribution indicates that the maxima are placed in two regions: one located between the inner reverse flow and the spiral vortex and the second between the spiral vortex core and the external nearly quiescent fluid. In the latter, the TKE production term distributions have the features of a Kelvin–Helmholtz-like instability. In the former, the TKE production seems to be related to a Kelvin–Helmholtz-like instability only at the interface between the bubble and the spiral vortex core.

JFM classification

Wakes/Jets: Separated flows Turbulent Flows: Shear layer turbulence Vortex Flows: Vortex breakdown
Type
Rapids
Information
Journal of Fluid Mechanics , Volume 768 , 10 April 2015 , R4
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Copyright
© 2015 Cambridge University Press 

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