Lean premixing prevaporizing (LPP) burners represent a promising solution for low-emission combustion in aeroengines. Since lean premixed combustion suffers from pressure and heat release fluctuations that can be triggered by unsteady large-scale flow structures, a deep knowledge of flow structures formation mechanisms in complex swirling flows is a necessary step in suppressing combustion instabilities. The present paper describes a detailed investigation of the unsteady aerodynamics of a large-scale model of a double swirler aeroengine LPP burner at isothermal conditions. A three-dimensional (3D) laser Doppler velocimeter and an ensemble-averaging technique have been employed to obtain a detailed time-resolved description of the periodically perturbed flow field at the mixing duct exit and associated Reynolds stress and vorticity distributions. Results show a swirling annular jet with an extended region of reverse flow near to the axis. The flow is dominated by a strong periodic perturbation, which occurs in all the three components of velocity. Radial velocity fluctuations cause important periodic displacement of the jet and the inner separated region in the meridional plane. The flow, as expected, is highly turbulent. The periodic stress components have the same order of magnitude of the Reynolds stress components. As a consequence the flow-mixing process is highly enhanced. Turbulence acts on a large spectrum of fluctuation frequencies, whereas the large-scale motion influences the whole flow field in an ordered way that can be dangerous for stability in reactive conditions.
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January 2006
Technical Papers
Unsteady Aerodynamics of an Aeroengine Double Swirler Lean Premixing Prevaporizing Burner
Pietro Zunino
Pietro Zunino
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Edward Canepa
Pasquale Di Martino
Piergiorgio Formosa
Marina Ubaldi
Pietro Zunino
J. Eng. Gas Turbines Power. Jan 2006, 128(1): 29-39 (11 pages)
Published Online: March 1, 2004
Article history
Received:
October 1, 2003
Revised:
March 1, 2004
Citation
Canepa, E., Di Martino, P., Formosa, P., Ubaldi, M., and Zunino, P. (March 1, 2004). "Unsteady Aerodynamics of an Aeroengine Double Swirler Lean Premixing Prevaporizing Burner." ASME. J. Eng. Gas Turbines Power. January 2006; 128(1): 29–39. https://doi.org/10.1115/1.1924720
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