Electronic Journal Technical Acoustics ISSN 1819-2408

S. S. Voronkov

On the mechanism of emergence turbulent Emmons spots

language: Russian

received 19.04.2020, published 25.05.2020

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ABSTRACT

The mechanism of the emergence of turbulent Emmons spots in the boundary layer of a viscous heat-conducting gas during a natural transition is considered. It is shown that the law of turbulence in a viscous heat-conducting gas describes one of the mechanisms of the emergence of turbulent Emmons spots in the boundary layer. It is noted that the found analytical expression for pressure pulsations qualitatively correctly describes the catastrophic, explosive mechanism for the appearance of turbulent spots in the boundary layer and the transition as a whole, established experimentally.
Keywords: turbulent Emmons spots, the law of emergence turbulence, viscous heat-conducting gas.

8 pages, 9 figures

Сitation: S. S. Voronkov. On the mechanism of emergence turbulent Emmons spots. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2020, 1.

REFERENCES

1. Kachanov Y.S., Kozlov V.V., Levchenko V.Ya. Arising Turbulence in a Boundary Layer. Novosibirsk: Nauka, 151 pages, 1982.
2. Garbaruk A.V. Transition to turbulence. Lecture 2. - S-P .: SPbSPU, 2019 . - 35 p. https://cfd.spbstu.ru/agarbaruk/turb_models/Term8_Lec02_transition.pdf
3. Davidson, P. A. Turbulence: an introduction for scientists and engineers. Oxford, UK: Oxford University Press, 2004. - 680 p.
4. Van Dyke M. Album of fluid and gas flows. - M.: Mir. 1986. - 184 p.
5. Voronkov S.S. On the law of emergence turbulence in a viscous heat-conducting gas. Electronic Journal Technical Acoustics, http://www.ejta.org, 2016, 6.
6. Klebanoff P.S., Tidstrom K.D., Sargent L.M. The treedimensional nature of boundary-layer instability. - J. Fluid Mech., 1962. v. 12, part. 1, p. 1-34.
7. Knapp C.F., Roache P.J. A combined visual and hot-wire, anemometerinvestigation of boundary layer transition. - AIAA J., 1968, v. 6, № 1, p. 29-36.
8. Fabrikant N.Ya. Aerodynamics. - M.: Nauka, 1964 . - 814 p.
9. Loitsyansky L.G. Mechanics of fluid and gas. Ed. 5th. - M.: Nauka, 1978. - 736 p.

Sergey Voronkov graduated from Leningrad Polytechnic Institute (Russia) in 1979, PhD. Presently he is a head of department at Pskov State University. Scientific area: hydrodynamics, nonlinear acoustics. e-mail: voronkovss(at)yandex.ru