Zobrazeno 1 - 10
of 72
pro vyhledávání: '"V. F. Kop'ev"'
Autor:
V. F. Kop’ev, A. V. Plastinin, M. Yu. Zaitsev, M. S. Kotelnikova, V. V. Nikulin, D. G. Akhmetov, E. A. Chashnikov
Publikováno v:
Combustion, Explosion, and Shock Waves. 55:390-394
By initiating explosive charges in a cylindrical tube with one end face being plugged, vortex rings with diameters of the order of 1 m and initial velocity of motion greater than 100 m/s are obtained. Such rings emit a clearly heard acoustic signal,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::248ff5923b58e7718b9609e6097d305b
https://doi.org/10.1134/s0010508219040038
https://doi.org/10.1134/s0010508219040038
Autor:
S. L. Denisov, S. Yu. Makashov, V. V. Gromov, M. Yu. Zaitsev, Nikolai N. Ostrikov, V. A. Anikin, V. F. Kop’ev
Publikováno v:
Acoustical Physics. 62:741-746
The paper presents the results of experimental studies on developing a technique to determine the acoustic properties of models of main helicopter rotors on an open test bench. The method of maximum length sequences is used to choose the optimum arra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2113e3878c72a0bf6f15876e34a514a2
https://doi.org/10.1134/s1063771016050043
https://doi.org/10.1134/s1063771016050043
Autor:
Georgy A. Faranosov, V. F. Kop’ev
Publikováno v:
Acoustical Physics. 54:319-326
The problem of generation of an instability wave leaving the edge of a half-plane that separates an immobile medium from a moving medium is considered. It is assumed that the instability wave is initiated by an acoustic wave arriving from the moving
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aea76ceb7c8ad8fa97103596f151e712
https://doi.org/10.1134/s1063771008030056
https://doi.org/10.1134/s1063771008030056
Publikováno v:
Acoustical Physics. 54:197-203
The sound generation by an air flow in a corrugated tube is studied experimentally for different values of the corrugation pitch and different tube lengths. The Strouhal numbers of sound generated in different tubes with different flow velocities lie
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aff9cd7a8731c70486b508ab425514ac
https://doi.org/10.1134/s1063771008020061
https://doi.org/10.1134/s1063771008020061
Autor:
S. A. Chernyshev, V. F. Kop'ev
Publikováno v:
Fluid Dynamics. 35:858-871
The problem of the stability of a circular cylinder in a circulation flow is considered under the condition that the cylinder can perform both free (free cylinder) and forced oscillations (cylinder on a spring). It is shown that this simple system ca
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::93ff53925103e6a2d9a4ee2bb3f5286f
https://doi.org/10.1023/a:1004140608555
https://doi.org/10.1023/a:1004140608555
Autor:
V. F. Kop’ev, S. A. Chernyshev
Publikováno v:
Fluid Dynamics. 33:169-175
The stability of a two-dimensional supersonic isothermal flow with a mixing layer is analyzed. Asymptotic expressions describing the stability characteristics of a thin mixing layer are derived. It is demonstrated that when the finite thickness of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1ac04153141bffcc4ddc044df6c53444
https://doi.org/10.1007/bf02698698
https://doi.org/10.1007/bf02698698
Autor:
S. A. Chernyshev, V. F. Kop'ev
Publikováno v:
Fluid Dynamics. 30:864-869
The instability of barrel-shaped vibrations of a vortex ring in an ideal fluid is investigated. These vibrations, stable for a vortex ring with a piecewise-uniform vorticity profile, appear to be unstable for a vortex ring with a smooth vorticity pro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eb2ca58bc45516897f452e765df5eb9b
https://doi.org/10.1007/bf02078201
https://doi.org/10.1007/bf02078201
Autor:
S. A. Chernyshev, V. F. Kop'ev
Publikováno v:
Fluid Dynamics. 26:719-729
A new approach to the description of the disturbed motion in the cores of localized steady vortices is developed within the context of an ideal incompressible fluid. For this purpose the linearized Helmholtz equation for the vorticity perturbations i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::32a7079c2e0de61b1abf47ca3e7c55ee
https://doi.org/10.1007/bf01050993
https://doi.org/10.1007/bf01050993
Autor:
V. F. Kop'ev, E. A. Leont'ev
Publikováno v:
Fluid Dynamics. 22:398-409
The mechanisms of generation and scattering of sound by a vortex ring are investigated on the basis of fluid dynamics. The vortex ring can serve as a simple dynamic model of the large-scale structures observed in shear flows. Moreover, it is probably
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::faeeccdf89a28b022635ded80053c7ab
https://doi.org/10.1007/bf01051920
https://doi.org/10.1007/bf01051920
Autor:
Kopiev, V. F.1 (AUTHOR) vkopiev@mktsagi.ru, Bychkov, O. P.1 (AUTHOR), Kopiev, V. A.1 (AUTHOR), Faranosov, G. A.1 (AUTHOR), Moralev, I. A.2 (AUTHOR), Kazansky, P. N.2 (AUTHOR)
Publikováno v:
Acoustical Physics. Apr2023, Vol. 69 Issue 2, p193-205. 13p.