Zobrazeno 1 - 10
of 22
pro vyhledávání: '"V. L. Okulov"'
Autor:
V. L. Okulov, Y. Fukumoto
Publikováno v:
Frontiers in Energy Research, Vol 10 (2022)
The study investigates helical vortices, which are fundamental structures in fluid dynamics, and a basic model of tip vortices behind wind turbines. In connection with the intensive development of wind energy, interest in modeling helical vortex wake
Externí odkaz:
https://doaj.org/article/1b51a2f57998481d9b23c8e18dd95222
Autor:
V. L. Okulov
Publikováno v:
Doklady Physics. 66:358-361
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9f7d0020630f332fbb6a18e5c59195a1
https://doi.org/10.1134/s1028335821120065
https://doi.org/10.1134/s1028335821120065
Publikováno v:
Vaz, J R P, Okulov, V L & Wood, D H 2021, ' Finite Blade Functions and Blade Element Optimization for Diffuser-augmented Wind Turbines ', Renewable Energy, vol. 165, pp. 812-822 . https://doi.org/10.1016/j.renene.2020.11.059
Placing a diffuser around a wind turbine can increase its power output, but not all mechanisms by which the diffuser alters the aerodynamics have been investigated thoroughly. Here, we concentrate on one such mechanism: the effect of the finite numbe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6895be8f66547b806069dab282bc9fd1
https://doi.org/10.1016/j.renene.2020.11.059
https://doi.org/10.1016/j.renene.2020.11.059
Autor:
V. L. Okulov, Ya. Fukumoto
Publikováno v:
Прикладная механика и техническая физика. 62:199-205
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ca1cc08a5b83c9005052bea35e8ad83a
https://doi.org/10.15372/pmtf20210319
https://doi.org/10.15372/pmtf20210319
Autor:
V. L. Okulov, Y. Fukumoto
Publikováno v:
Okulov, V L & Fukumoto, Y 2020, ' Analytical solution for self-induced motion of a helical vortex with a Gaussian core ', Thermophysics and Aeromechanics, vol. 27, no. 4, pp. 481-488 . https://doi.org/10.1134/S0869864320040022
The paper presents an analytical solution for helical vortices with a Gaussian vorticity distribution in the core, which is confirmed by experimental and numerical simulations. This result is obtained by extending the Dyson method to the Biot–Savar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::555ff1f0f9f8e8b7ee239b305b6b5736
https://doi.org/10.1134/s0869864320040022
https://doi.org/10.1134/s0869864320040022
Publikováno v:
Shtork, S I, Gesheva, E S, Kuibin, P A, Okulov, V L & Alekseenko, S V 2020, ' Parametric Description of the Stationary Helical Vortex in a Hydrodynamic Vortex Chamber ', Journal of Applied Mechanics and Technical Physics, vol. 61, no. 3, pp. 359-367 . https://doi.org/10.1134/S0021894420030062
A swirling flow in a tangential-type hydrodynamic chamber with stationary vortex structures is experimentally investigated. The main attention is paid to determining the geometric and kinematic parameters necessary for a correct description of helica
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9dac4ee87fda80963ee02e8666b10420
https://doi.org/10.15372/pmtf20200306
https://doi.org/10.15372/pmtf20200306
Autor:
V. L. Okulov, B. R. Sharifullin, N. Okulova, J. Kafka, R. Taboryski, J. N. Sørensen, I. V. Naumov
Publikováno v:
Okulov, V L, Sharifullin, B R, Okulova, N, Kafka, J, Taboryski, R, Sørensen, J N & Naumov, I V 2022, ' Influence of nano-and micro-roughness on vortex generations of mixing flows in a cavity ', Physics of Fluids, vol. 34, no. 3, 032005 . https://doi.org/10.1063/5.0083503
Experiments were carried out in a water-filled elongated cup of a “kitchen scale,” where motion was created by a rotating disk with various micro- and nano-roughness in the top of the cup. The obtained results have shown that for some patterns of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fb047953feb78dcbe901c081d513ad93
https://doi.org/10.1063/5.0083503
https://doi.org/10.1063/5.0083503
Autor:
E. S. Gesheva, Sergei V. Alekseenko, V. L. Okulov, David Wood, Sergey Shtork, Jens Nørkær Sørensen, P. A. Kuibin
Publikováno v:
Okulov, V L, Gesheva, E S, Kuibin, P A, Shtork, S I, Sørensen, J, Wood, D & Alekseenko, S V 2020, ' Differences between the motion of a helical vortex and the movement of fluid particles along its axis ', Thermophysics and Aeromechanics, vol. 27, no. 4, pp. 473-480 . https://doi.org/10.1134/S0869864320040010
The motion of a helical vortex and the movement of the fluid particles along its axis are analyzed. The same form of the helical axis of the vortex and the trajectory of the particles sometimes leads to a false assumption of equality of these two dif
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2743e2a05cf2262f308f92d4575a2a93
https://orbit.dtu.dk/en/publications/514c8be3-ba30-422d-a0a8-6510fb2b3318
https://orbit.dtu.dk/en/publications/514c8be3-ba30-422d-a0a8-6510fb2b3318
Publikováno v:
Ocean Engineering. 235:109337
Lifting line analyses of propellers and horizontal-axis turbines require the axial and circumferential velocities induced by the helicoidal vorticity shed from the blades. These velocities can be found from the analytic solution for a helical vortex
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b3fcea184aa39d1ea39933aeaa393a1
https://doi.org/10.1016/j.oceaneng.2021.109337
https://doi.org/10.1016/j.oceaneng.2021.109337
Vortex motion is one of the basic states of a flowing continuum. Intere- ingly, in many cases vorticity is space-localized, generating concentrated vortices. Vortex filaments having extremely diverse dynamics are the most characteristic examples of s