A swirling jet with vortex breakdown: three-dimensional coherent structures

Abstract

The paper reports on shape of a three-dimensional coherent structure in a velocity field of a high-swirl turbulent jet with the bubble-type vortex breakdown. A set of the 3D instantenous velocity fields was measured by using the tomographic particle image velocimetry (tomographic PIV) technique and processed by the proper orthogonal decomposition (POD) method. The detected intensive coherent velocity component corresponded to a helical vortex core of the swirling jet and two secondary spiral vortices. The entire coherent structure was rotating around the jet axis in compliance with the direction of the flow swirl. From the 3D data it is concluded that the dynamics of the strsucture can be described by a traveling wave equation: Re[A(y, r)·e^{i(mθ + ky - ωt)}] with the number of the spiral mode m = +1 for positively defined k and ω.

Original language	English
Pages (from-to)	301-304
Number of pages	4
Journal	Thermophysics and Aeromechanics
Volume	23
Issue number	2
DOIs	https://doi.org/10.1134/S0869864316020189
Publication status	Published - 1 Mar 2016

Keywords

coherent mode
POD
swirling jet
tomographic PIV
vortex core breakdown

ASJC Scopus subject areas

Radiation
Nuclear and High Energy Physics

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Alekseenko, S. V., Dulin, V. M., Tokarev, M. P., & Markovich, D. M. (2016). A swirling jet with vortex breakdown: three-dimensional coherent structures. Thermophysics and Aeromechanics, 23(2), 301-304. https://doi.org/10.1134/S0869864316020189

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title = "A swirling jet with vortex breakdown: three-dimensional coherent structures",

abstract = "The paper reports on shape of a three-dimensional coherent structure in a velocity field of a high-swirl turbulent jet with the bubble-type vortex breakdown. A set of the 3D instantenous velocity fields was measured by using the tomographic particle image velocimetry (tomographic PIV) technique and processed by the proper orthogonal decomposition (POD) method. The detected intensive coherent velocity component corresponded to a helical vortex core of the swirling jet and two secondary spiral vortices. The entire coherent structure was rotating around the jet axis in compliance with the direction of the flow swirl. From the 3D data it is concluded that the dynamics of the strsucture can be described by a traveling wave equation: Re[A(y, r)·ei(mθ + ky - ωt)] with the number of the spiral mode m = +1 for positively defined k and ω.",

keywords = "coherent mode, POD, swirling jet, tomographic PIV, vortex core breakdown",

author = "Alekseenko, {S. V.} and Dulin, {V. M.} and Tokarev, {M. P.} and Markovich, {D. M.}",

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AU - Alekseenko, S. V.

AU - Dulin, V. M.

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AU - Markovich, D. M.

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N2 - The paper reports on shape of a three-dimensional coherent structure in a velocity field of a high-swirl turbulent jet with the bubble-type vortex breakdown. A set of the 3D instantenous velocity fields was measured by using the tomographic particle image velocimetry (tomographic PIV) technique and processed by the proper orthogonal decomposition (POD) method. The detected intensive coherent velocity component corresponded to a helical vortex core of the swirling jet and two secondary spiral vortices. The entire coherent structure was rotating around the jet axis in compliance with the direction of the flow swirl. From the 3D data it is concluded that the dynamics of the strsucture can be described by a traveling wave equation: Re[A(y, r)·ei(mθ + ky - ωt)] with the number of the spiral mode m = +1 for positively defined k and ω.

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