Polychromatic Hilbert Diagnostics of the Evolution of Vortex Rings Induced by a Pressure Jump on a Hole
Y. N. Dubnishchev1, N. A. Dvornikov2, V. G. Nechaev3, O. N. Novoselova1
1 Novosibirsk State Technical University Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences
2 Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences
3 Novosibirsk State Technical University
dubnistchev@itp.nsc.ru
Keywords: optical diagnostics of flows, Hilbert optics, colored Hilbert visualization, vortex rings
Pages: 13-21
Abstract
The evolution of vortex structures induced by a pressure jump on the output hole of the chamber is experimentally studied by methods of the Hilbert diagnostics. Various types of optical filters that ensure the Hilbert and Foucault-Hilbert transforms are considered. Colored visualization of the fields of the phase optical density of the vortex structure in an air medium is performed by using a linear source of white light and a quadrature Hilbert filter.
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