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Coherent structures in a swirling jet with vortex breakdown and combustion. Investigation by PIV and PLIF

DOI: 10.1615/THMT-18.170
pages 213-225

A. S. Lobasov
Novosibirsk State University, Novosibirsk, 630090, Russia; Kutateladze Institute of Thermophysics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, 630090, Russia

L. M. Chikishev
S.S. Kutateladze Institute of Thermophysics, Siberian Branch of RAS 1 Ak. Lavrentyev Avenue, 630090, Novosibirsk; Novosibirsk State University, 2 Pirogova Street, 630090, Novosibirsk

Vladimir M. Dulin
Kutateladze Institute of Thermophysics, 1, Lavrentyev Avenue, Novosibirsk, 630090, Russia; Department of Science and Research, Novosibirsk State University 2, Pirogova Street, 630090, Russia

Dmitriy M. Markovich
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences (IT SB RAS), 1, Lavrentyev Ave., Novosibirsk, 630090, Russia; Department of Physics, Novosibirsk State University (NSU), 1, Pirogov Str., Novosibirsk, 630090, Russia; Institute of Power Engineering, Tomsk Polytechnic University (TPU), 30, Lenin Ave., Tomsk, 634050, Russia


This paper reports on the investigation of coherent structures in a high-swirl jet with vortex breakdown (Re = 5 000) and combustion of a methane/air mixture (with equivalence ratio equal to 0.7 and 1.4). The measurements were performed by a combined application of the stereo PIV, OH PLIF and HCHO PLIF techniques. The velocity data were processed by the proper orthogonal decomposition (POD) and the PLIF data was conditionally sampled according to the POD correlation coefficients. For the non-reacting jet and lean flame, the POD has revealed presence of a coherent structure, consisted of helical vortex structures in the inner and outer mixing layers. Based on the PLIF data it was found that the inner spiraling vortex structure was correlated with regions of positive fluctuations of the local heat release.

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