Analysis of Coherent Structures in Circular and Chevron Jets
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The present study reports on measurements of the spatial shape and dynamics of large-scale coherent structures in circular and chevron submerged jets by the volumetric particle image velocimetry technique. A tomographic PIV system was used for the measurements of 3D velocity fields with 2 kHz acquisition rate. The datasets of PIV velocity fields were analyzed by spatial Fourier transform over the azimuthal angle and proper orthogonal decomposition (POD). It was concluded that for the chevron jet the turbulent kinetic energy of the axisymmetric mode m = 0, related with ring-like vortices in mixing layer of the jet, was more than twice smaller in comparison with the jet from a circular nozzle.
Keywords
circular and chevron jets, Tomographic PIV, coherent structures
Acknowledgements
This work was supported by the Russian Science Foundation, grant number 18-79-00138
УДК 532.517.4; 532.525.2; 532.522.2; 533.69.048
Analysis of Coherent Structures in Circular and Chevron Jets
The material was received by the Editorial Board: 30.07.2018
Abstract The present study reports on measurements of the spatial shape and dynamics of large-scale coherent structures in circular and chevron submerged jets by the volumetric particle image velocimetry technique. A tomographic PIV system was used for the measurements of 3D velocity fields with 2 kHz acquisition rate. The datasets of PIV velocity fields were analyzed by spatial Fourier transform over the azimuthal angle and proper orthogonal decomposition (POD). It was concluded that for the chevron jet the turbulent kinetic energy of the axisymmetric mode m = 0, related with ring-like vortices in mixing layer of the jet, was more than twice smaller in comparison with the jet from a circular nozzle.
Keywords
circular and chevron jets, Tomographic PIV, coherent structures
Acknowledgements
This work was supported by the Russian Science Foundation, grant number 18-79-00138
УДК 532.517.4; 532.525.2; 532.522.2; 533.69.048
Analysis of Coherent Structures in Circular and Chevron Jets References: Abdurakipov S. S., Dulin V. M., Tokarev M. P., Markovich D. M. Analysis of Coherent Structures in Circular and Chevron Jets. Siberian Journal of Physics . 2018, vol. 13, no. 4. P. 46–59. (in Russ.). DOI: 10.25205/2541-9447-2018-13-4-46-59