Zobrazeno 1 - 10
of 108
pro vyhledávání: '"Valery Okulov"'
Publikováno v:
Energies, Vol 14, Iss 20, p 6750 (2021)
The review reflects physical solutions for de-icing, one of the main problems that impedes the efficient use of wind turbines for autonomous energy resources in cold regions. This topic is currently very relevant for ensuring the dynamic development
Externí odkaz:
https://doaj.org/article/bf53af4654494ebc8d1fdf80f1649063
Autor:
Ivan Kabardin, Sergey Dvoynishnikov, Maxim Gordienko, Sergey Kakaulin, Vadim Ledovsky, Grigoriy Gusev, Vladislav Zuev, Valery Okulov
Publikováno v:
Energies, Vol 14, Iss 20, p 6485 (2021)
The development of wind-power engineering in the Arctic has led to increasing wind turbines in cold climatic zones. A problem operating wind turbines in cold conditions is the icing of blades. The icing of the blades leads to a change in rotor aerody
Externí odkaz:
https://doaj.org/article/833249002f5b42efba81bfdfc936f527
Autor:
Ya. Fukumoto, Valery Okulov
Publikováno v:
Journal of Applied Mechanics and Technical Physics. 62:519-524
The accuracy of numerical calculations of the dynamics of vortex filaments is estimated via the cutoff method using the example of the motion of helical vortices. In the case of helical vortices with uniform vorticity distribution of a Rankine core,
Publikováno v:
Doklady Physics. 66:118-121
Publikováno v:
Naumov, I V, Kashkarova, M V, Mikkelsen, R F & Okulov, V L 2020, ' The structure of the confined swirling flow under different phase boundary conditions at the fixed end of the cylinder ', Thermophysics and Aeromechanics, vol. 27, no. 1, pp. 89-94 . https://doi.org/10.1134/S0869864320010084
The paper analyzes the complex topology of swirling flows generated in the cylinder by its rotating end face. Using the flow visualization for different parameters of swirl of the upper end of the cylinder, the general laws of the evolution of the re
Autor:
I. K. Kabardin, Vadim Ledovsky, Maxim Gordienko, Vladislav Zuev, Valery Okulov, Grigoriy Gusev, Sergey Kakaulin, Sergey V. Dvoynishnikov
Publikováno v:
Energies, Vol 14, Iss 6485, p 6485 (2021)
The development of wind-power engineering in the Arctic has led to increasing wind turbines in cold climatic zones. A problem operating wind turbines in cold conditions is the icing of blades. The icing of the blades leads to a change in rotor aerody
Publikováno v:
Energies, Vol 14, Iss 6750, p 6750 (2021)
The review reflects physical solutions for de-icing, one of the main problems that impedes the efficient use of wind turbines for autonomous energy resources in cold regions. This topic is currently very relevant for ensuring the dynamic development
Autor:
Igor V. Naumov, I. K. Kabardin, Robert Flemming Mikkelsen, Jens Nørkær Sørensen, Valery Okulov
Publikováno v:
Okulov, V, Kabardin, I K, Mikkelsen, R F, Naumov, I & Sørensen, J N 2019, ' Helical self-similarity of tip vortex cores ', Journal of Fluid Mechanics, vol. 859, pp. 1084-1097 . https://doi.org/10.1017/jfm.2018.850
The present work investigates local flow structures and the downstream evolution of the core of helical tip vortices generated by a three-bladed rotor. Earlier experimental studies have shown that the core of a helical tip vortex exhibits a local hel
Autor:
Valery Okulov
Publikováno v:
Okulov, V L 2020, ' Vortex Pair of Coaxial Helical Filaments ', Journal of Applied Mechanics and Technical Physics, vol. 61, no. 3, pp. 343-349 . https://doi.org/10.1134/S0021894420030049
Possible existence of vortex pairs of coaxially rotating helical filaments with circulation in the opposite directions is theoretically studied. Such pairs are generated, e.g., by a rotating blade of a rotor with identical strengths of the tip and ro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::374e0d8b0e4f3c1b869c47366067352f
https://orbit.dtu.dk/en/publications/8012e7b6-de32-4786-99cc-0649d2bd34d8
https://orbit.dtu.dk/en/publications/8012e7b6-de32-4786-99cc-0649d2bd34d8
Autor:
Jens Nørkær Sørensen, Valery Okulov
Publikováno v:
Okulov, V L & Sørensen, J N 2020, ' The self-induced motion of a helical vortex ', Journal of Fluid Mechanics, vol. 883, A5 . https://doi.org/10.1017/jfm.2019.837
Helical vortices have been studied for more than a century to understand basic aspects of fluid motion. Helical vortices appear both in nature, e.g. as tornadoes, and in many industrial applications associated with mixing and in wakes behind rotors.