23rd Congress of International Council of the Aeronautical Sciences, 8-13 September, 2002, Toronto, Canada
Paper ICAS 2002-5.8.2

VORTEX BREAKDOWN CONTROL FOR REDUCED COMBUSTION PRESSURE PULSATIONS

C. O. Paschereit (1), P. Flohr (1), W. Geng (1), E. Gutmark (2)
(1) ALSTOM Ltd., Switzerland; (2) University of Cincinnati, USA

Keywords: vortex breakdown, flow control, combustion instability

Flame anchoring in a swirl-stabilized combustor occurs in an aerodynamically generated re-circulation region which is a result of vortex breakdown (VBD). The characteristics of the recirculating flow are dependent on the swirl number and on axial pressure gradients. Coupling with downstream pressure pulsations in the combustor affect the VBD process. The present paper describes combustion instability that is associated with vortex breakdown.

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