Experimental Study on the Interaction Between Axial Swirl and Transverse Jet in Aero-engine Combustor
In aero-engine combustor,the interaction between the axial swirl and the transverse jets generated by the primary holes and the dilution holes ensures the efficient mixing and stable combustion in the combustor.In the present study,a high resolution particle image velocimetry(PIV)system is used to measure the detailed flow field in the aero-engine combustor.The interaction mechanism between the axial swirl and transverse jet in the combustor is revealed through the comprehensive analysis of the vortex structures and turbulent statistical characteristics.The result indicates that the central recirculation zone in the combustor is formed by the combined effect of the low pressure zone generated by the swirling flow and the cut-off effect of the transverse jet on the main stream.The strong shear caused by the transverse jet obviously accelerates the formation of the central recirculation zone.In addition,the affected area of transverse jet in the combustor is enlarged under the effect of swirling flow,which highly enhances the momentum transport between the transverse jet and the surrounding main stream.In the region downstream the primary hole,the turbulence intensity is highly enhanced due to the interaction of transverse jet and swirling flow,resulting in a more uniform velocity distribution in the region near the outlets of combustor.
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