Open AccessEffect of hydrodynamic coherent structures on local mixing in a model GT-burner
Author(s) -
A. S. Lobasov
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1677/1/012042
Subject(s) - vortex , turbulence , particle image velocimetry , mechanics , combustor , planar laser induced fluorescence , turbulence kinetic energy , mixing (physics) , reynolds number , jet (fluid) , materials science , physics , chemistry , optics , combustion , laser , laser induced fluorescence , organic chemistry , quantum mechanics
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.