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ICLASS 94<br>Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems

ISBN:
978-1-56700-019-1 (Print)
978-1-56700-445-5 (Online)

EFFECT OF SEMI-CONFINEMENT ON SPRAY BEHAVIOUR IN THE FLOW FIELD DOWNSTREAM OF AN AERO-ENGINE COMBUSTOR DOME

Vincent G. McDonell
UCI Combustion Laboratory, University of California, Irvine, California 92697-3550, USA

S.W. Lee
University of California Irvine, California, USA

G. Scott Samuelsen
Department of Mechanical and Aerospace Engineering, University of California, Irvine, California 92697-3550, USA

Abstract

The structure of the aerodynamic flow field and interaction of this flow field with the spray produced by a SNECMA/GE CFM-56 swirl cup operated at atmospheric conditions and ambient inlet temperatures is examined. The role of semi-confinement on the flow field is studied with the rationale that this geometry tends towards that found in the annular combustor which utilizes this swirl cup. Two-component phase Doppler interferometry (PDI) is applied to measure three components of the gas phase velocities in the region immediately downstream of the device. In addition, PDI is utilized to characterize the spray behavior in terms of the drop size and velocity distributions and concentrations. To add perspective to the study, the distribution of the fuel is also characterized using Planar Laser Induced Fluorescence (PLIF). The results reveal that, for the present case, confinement on two sides with separation of 83.3 mm has little impact on the flow field. With the exception of acceleration of the flow near die wall, the aerodynamics are essentially unchanged. The presence of the walls affects the droplet behavior only due to impaction upon the wall.