Abstract
Turbulent mixing and swirling flow structure in model GT-burner at atmospheric pressure have been investigated (Re = 5000) by using a combination of the particle image velocimetry and planar laser-induced fluorescence methods. Based on the measurements of the velocity fields by a stereo PIV in combination with acetone-PLIF, three-components of turbulence kinetic energy, Reynolds stresses and turbulent fluxes are evaluated. Contribution of large-scale helical vortex structures to the local mixing has been evaluated by snapshot POD method based on singular value decomposition. It was found that helical vortex structures correspond to the vortex core, spiraling around the central recirculation zone. In the case of supply fuel via central channel, the formation of a secondary vortex structure located between the fuel jet and the recirculation zone is observed, contributing to the mixing of fuel with air.
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