Abstract: The work is aimed at solving the scientific and practical problem of non-disturbing diagnostics of the phase and temperature fields of reacting jets and flames. The method based on polychromatic Hilbert visualization of the phase optical density fields induced by the temperature field in the studied medium, pixel-by-pixel processing of RAW images recorded by the photomatrix in RGB channels, and Hilbert verification of the results is presented with an example of studying an axisymmetric hydrogen-air diffusion flame. The phase structure of the probing light field in the axial symmetry approximation of the flame under investigation is analyzed using the Abel transform. Iterative selection of radial temperature profiles, adapted Bezier curves, is performed with the subsequent calculation of the spatial structure of the refractive index and phase function. The reconstruction of the temperature field by the example of the study of a hydrogen-air flame is carried out taking into account the diversity of the partial optical properties of the gas mixture in a model consistent with the Gladstone-Dale dispersion formula. The influence of disturbances in the air surrounding the flame on its axial symmetry is discussed. The criterion for the reliability of the research results is a comparison of the hilbertograms obtained in the experiment and the hilbertograms reconstructed from phase structures induced by temperature fields. © 2021 National Research Nuclear University. All rights reserved.

Cite: Dubnishchev Y.N. , Arbuzov V.A. , Arbuzov E.V. , Zolotukhina O.S. , Lukashov V.V.
Polychromatic diagnostics of the flame with Hilbert verification of the visualized phase structure
Научная визуализация (Scientific Visualization). 2021. V.13. N4. P.1-8. DOI: 10.26583/sv.13.4.01 Scopus OpenAlex

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Scopus:	2-s2.0-85119603491
OpenAlex:	W3214549062

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