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Knyazev A.V.,Novgorod State University | Chernorukov N.G.,Novgorod State University | Ladenkov I.V.,Novgorod State University | Ershova A.V.,Afrikantov Experimental Design Bureau of Mechanical Engineering
Russian Journal of Inorganic Chemistry | Year: 2011

Compounds formed in the M 2 I O-Cr 2O 3-TiO 2. system were synthesized by solid-state reactions. These compounds crystallize in hollandite- and spinel-type structures. The features of themal decomposition of the compounds with the compositions M 2 I Cr 2Ti 6O 16(M I = Na, K, Cs) and LiCrTiO 4 were revealed, and their thermal expansion coefficients were determined with the use of high-temperature X-ray diffraction analysis. © 2011 Pleiades Publishing, Ltd. Source


Patent
Open Joint Stock Company Tvel, Open Joint Stock Company Novosibirsk Chemical Concentrates Plant and Afrikantov Experimental Design Bureau of Mechanical Engineering | Date: 2013-10-14

The present disclosure provides for designs of fuel assemblies and may be used in pressurized water reactors. In some embodiments, a nuclear reactor fuel assembly may comprise a bundle of fuel rods, guide channels, two nozzles, one of which has a bearing plate with openings, elements for the detachable connection of the nozzles to the guide channels, a detachable connection locking device and a locking device fasteners, the elements for the detachable connection of the nozzles to the guide channels have a cross-section size greater than the size of the openings in the nozzle bearing plate. The present disclosure may provide greater ease in loading and unloading, reduce the time required for the mounting and removal of the nozzles during manufacture of the fuel assembly, and reduce the length of the reactor refueling process.


Ilyakhinskii I.A.,Afrikantov Experimental Design Bureau of Mechanical Engineering | Bugreev A.V.,Afrikantov Experimental Design Bureau of Mechanical Engineering | Ilyakhinskii A.V.,Russian Academy of Sciences | Rodyushkin V.M.,Russian Academy of Sciences
Atomic Energy | Year: 2016

The relation between the structure and acoustic parameters for silicon carbide/graphite composite is shown. The effect of the composition and density of the composite and the size of the structural component of silicon on the propagation velocity and damping of the longitudinal ultrasonic wave at frequency 1, 4, and 5 MHz is determined. The results obtained can serve as a basis for testing the quality of the parts in tribocoupling units. © 2016 Springer Science+Business Media New York Source


Khlybov A.A.,Nizhny Novgorod State Technical University | Pichkov S.N.,Afrikantov Experimental Design Bureau of Mechanical Engineering | Shishulin D.N.,Afrikantov Experimental Design Bureau of Mechanical Engineering
Russian Journal of Nondestructive Testing | Year: 2016

The results of the acoustic monitoring of the damage that accumulated in an austenitic steel sample tube during thermal pulsation are presented. © 2016, Pleiades Publishing, Ltd. Source


Vasil'ev A.Y.,RAS Institute of Continuous Media Mechanics | Kolesnichenko I.V.,RAS Institute of Continuous Media Mechanics | Mamykin A.D.,RAS Institute of Continuous Media Mechanics | Frick P.G.,RAS Institute of Continuous Media Mechanics | And 3 more authors.
Technical Physics | Year: 2015

Turbulent free convection of liquid sodium in a straight thermally insulated tube with a length equal to 20 diameters and with end heat exchangers ensuring a fixed temperature drop is investigated experimentally. The experiments are performed for a fixed Rayleigh number Ra = 2.4 × 106 and various angles of inclination of the tube relative to the vertical. A strong dependence of the power transferred along the tube on the angle of inclination is revealed: the Nusselt number in the angular range under investigation changes by an order of magnitude with a maximum at the angle of 65° with the vertical. The characteristics of large-scale circulation and turbulent temperature pulsations show that convective heat transfer is mainly determined by the velocity of large-scale circulation of sodium. Turbulent pulsations are maximal for small angles of inclination (α = 20°–30°) and reduce the heat flux along the channel, although in the limit of small angles (vertical tube), there is no large-scale circulation, and the convective heat flux, which is an order of magnitude larger than the molecular heat flux, is ensured only by small scale (turbulent) flow. © 2015, Pleiades Publishing, Ltd. Source

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