Coherent Structures and Turbulent Transfer in the Initial Region of Jets and Flame in Swirling Flow
A. S. Lobasov, L. M. Chikishev, V. M. Dulin, D. M. Markovich
Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: закрученная струя при наличии горения, распад вихревого ядра, когерентные структуры, турбулентный тепломассообмен, swirling in the presence of combustion, vortex core breakdown, coherent structure, turbulent heat and mass transfer
Abstract
This paper presents the results of experimental studies of the spatial flow structure and coherent structures in the initial region of swirling jets at a Reynolds number of 5000 and various swirl parameters. The contribution of these structures to the intensity of turbulent transfer of momentum and mass (impurity) was first quantitatively evaluated. In addition, the effect of coherent structures on pulsations of the intensity of local heat release due to the deformation of the flame front during combustion of mixtures of methane at an air excess coefficient of 1.43 was investigated for the case of strong swirling with vortex core breakdown.
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