Visualization of the structure of a supersonic underextended jet with the array of positionally sensitive photodetectors

D. A. Marakasov; V. M. Sazanovich; A. A. Sukharev; R. Sh. Tsvyk; A. N. Shesternin

doi:10.1117/12.2575288

12 November 2020 Visualization of the structure of a supersonic underextended jet with the array of positionally sensitive photodetectors

D. A. Marakasov, V. M. Sazanovich, A. A. Sukharev, R. Sh. Tsvyk, A. N. Shesternin

Author Affiliations +

Proceedings Volume 11560, 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics; 115601H (2020) https://doi.org/10.1117/12.2575288
Event: 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, 2020, Moscow, Russian Federation

Abstract

A study of the distortions of the wavefront of a laser beam, passed through an axially symmetric nonisobaric supersonic jet is performed. It has been shown analytically and demonstrated in experiments at the Vertical Jet Unit of the Institute of Applied Mathematics and Mathematics SB RAS that (Novosibirsk) the set of average local slopes of the wavefront of the beam in the plane behind the jet reflects the basic elements of the spatial structure of the jet (Mach disk, internal and external mixing layer, hanging and associated jumps). On the basis of measuring the local slopes of the wavefront of the transilluminated beam for various npr values (pressure ratio in the pre-chamber and surrounding space), images of the corresponding jets are constructed. The obtained results form the basis of the non-contact study of the spatial distribution of density inhomogeneities in supersonic flows with a complex structure.

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D. A. Marakasov, V. M. Sazanovich, A. A. Sukharev, R. Sh. Tsvyk, and A. N. Shesternin "Visualization of the structure of a supersonic underextended jet with the array of positionally sensitive photodetectors", Proc. SPIE 11560, 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, 115601H (12 November 2020); https://doi.org/10.1117/12.2575288

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