Flow field characterization in a premixed, swirling annular flow


This paper presents measurements and large eddy simulations of the flowfield in an annular, swirling, reacting flowfield. Depending upon operating conditions, the flame can exhibit four different configurations, depending upon whether it is stabilized in the vortex breakdown bubble, inner shear layer, and/or outer shear layer. Flow field characteristics such as vortex breakdown bubble length, vortex breakdown zone topology, annular jet spreading angle, and outer recirculation zone topology vary substantially between these different configurations. For the most case, the LES captures these different topological flow features and flow bifurcations, although some quantitative differences exist for the reacting cases, principally in strength of the recirculation zone and jet spreading angle. Copyright © 2012 by the American Institute of Aeronautics and Astronautics, Inc.

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50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition