2013 1(12)

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Pages:

346 - 352

Language:

RU

Ref.:

10


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APPLICATION OF DMD FOR DETECTION OF GLOBAL INSTABILITY MODES IN STRONGLY SWIRLING FLAME

Abdurakipov S.S.1,2, Dulin V.M.1,2, Markovich D.M.1,2, Chikishev L.M.1,2

1 Institute of Thermophysics SB RAS, Novosibirsk, Russia
2 Novosibirsk State University, Novosibirsk, Russia


Citation:

Abdurakipov S.S. Application of DMD for detection of global instability modes in strongly swirling flame / S.S. Abdurakipov, V.M. Dulin, D.M. Markovich, L.M. Chikishev // Modern Science: Researches, Ideas, Results, Technologies. - Dnepropetrovsk: SPIC "Triacon". - 2013. - Iss. #1(12). - PP. 346 - 352


Keywords:

strongly swirling propane-air flame; global instability modes; large-scale vortices


Abstracts:

The present work is devoted to experimental study of dynamics, spatial shape and intensity of coherent vortex structures in strongly swirling propane-air flame. The paper demonstrates an effectiveness of Dynamic Mode Decomposition (DMD) approach for detection of global instability modes in turbulent flow from series of instantaneous velocity fields measured by Particle Image Velocimetry (PIV) technique with high acquisition rate. Comparison of the results of isothermal and reacting flows was performed. Global instability mode, associated with precession of vortex core (PVC), was determined for both cases. Together with PVC, low-frequency oscillations of outside air, corresponding to global instability mode, caused by the action of buoyancy forces on the flame, were also observed. Based on low-order reconstruction from DMD, 3D spatial structure and dynamics of intense spiral vortices were recovered within recirculation zone and outer shear layer.


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