Global Energy

RAR RUS 5-14 Seleznev Dmitrii Greshnyakov Georgii APPLICATION OF THE RESISTIVE-CAPACITIVE PRINCIPLE OF REGULATING THE ELECTRIC FIELD OF CABLE COUPLINGS FOR 110 KV The article deals with the use of a tube-regulator (multifunctional element) as reinforcing insulation for 110 kV couplings, the operation of which is based on the use of heat-shrinkable tubes with special properties as elements that leveling the field. In this paper, we consider the key features of modeling the design of the tube-regulator and its optimization, made in the form of a combination of several heat-shrinkable tubes with specified parameters. Optimization of the design and analysis of its performance was carried out in a specialized software package ELCUT Professional. In the course of the work, a general optimal view of the structure and the parameters of each individual element of the tube-regulator were found. The most vulnerable zones were also found in which the electric field strength reaches the highest values. Recommendations are given on the arrangement of the structure to obtain the best possible picture of the distribution of the electric field in cable cutting. 10.18721/JEST.26101 621.3 tube-regulator cable coupling computer simulation resistive-capacitive method reinforcing insulation ELCUT https://engtech.spbstu.ru/article/2020.111.1/ 1_Seleznev.pdf

RAR RUS 15-28 Kolenko Grigorii S. Laskin Alexander a.s.laskin@mail.ru UNSTEADY AND AVERAGED AERODYNAMIC LOADS ACTING ON ROTOR BLADES OF DIFFERENT GEOMETRY The blades of modern axial turbine stages are highly loaded parts.Increased dynamic stresses in the material of the blades can lead to their fatigue failure.The source of dynamic stresses in the blades are variable aerodynamic forces, which must be evaluated at the design stage.The article considers the influence of the main geometric parameters of the axial stage on the averaged and non-stationary aerodynamic loads acting on the rotor blades. In particular, the influence of rotor-stator axial gap, blade count ratio and the relative length of blades is considered. Some foreign research results and authors' own results obtained by numerical-computational methods of computational gas dynamics (using the Ansys CFX package) are compared. Two model axial stages of the Department of Turbines, Hydraulic Machines and Aircraft Engines of SPbPU, which differ in the ratio of the average diameter to the height of the blade and the value of the rotor-stator axial gap, were selected as objects of study. 10.18721/JEST.26102 621.438 unsteady blade forces axial turbine vibration reliability unsteady blade loading rotor-stator axial gap blade row interaction effect of blade count ratio https://engtech.spbstu.ru/article/2020.111.2/ 2_Kolenko.pdf

RAR RUS 29-40 Arsentyeva Xenia xenia.ars@gmail.com Mamutov Viacheslav vmamutov@mail.ru STRAIN RATE INFLUENCE ON THIN SHEET METAL DRAWING SIMULATION USING LS-DYNA® The article presents an investigation of the influence of material model selection and strain rate accounting on the calculation error during impulse sheet metal drawing simulation. Computer models of electro-hydraulic thin sheet metal drawing processes have been developed in the LS-DYNA finite-element complex. Computer simulation in this study was carried out for 0.24 mm-thick CuZn33 brass sheet blank and 1mm-thick Aluminum 5754 under impulse drawing into a die 60 mm in diameter. Technique of refining of speed hardening coefficient of metal using LS-DYNA complex has been developed. The technique is based on preliminary computer calculations, which allow defining a changes range of elements effective strain rates in different parts of workpiece. The technique is simple to execute and implement. Comparison of methods of the strain rate hardening accounting during usage of different material models of workpiece in computer simulations have been provided. The applicability of material models for high-speed computer simulation of thin sheet metal drawing has been assessed. 10.18721/JEST.26103 621.7.044 impulse drawing thin sheet metall finite-element software LS-DYNA strain rate strain hardening https://engtech.spbstu.ru/article/2020.111.3/ 3_Arsenteva.pdf

RAR RUS 41-52 Ozerskoi Nikolaii Popovich Anatoliy popovicha@mail.ru Ermakov Boris PLASMACHEMICAL SYNTHESIS OF NANODISPERSED SILICON POWDER AND ITS USE AS ANODE IN LITHIUM-ION BATTERY In the work we investigated in detail the process of obtaining nanosized spherical silica powder from micron powder fragmental forms using inductively coupled argon-hydrogen plasma.The mode with the highest percentage of usable yield was developed. In the course of research, the phase composition, the morphology of the particles, particle size distribution and specific surface area of the powder was studied. The resulting silicon powder was used as the anode material for the lithium-ion battery. The assembled model of the battery was investigated using the process of galvanostatic charge/discharge, cyclic voltammetry. The working electrode showed a capacity of 2056 mAh/g during charge and 1977 mAh/g during discharge, respectively.The dependence of the number of charge/discharge cycles on the particle size of the resulting silicon powder was also established. 10.18721/JEST.26104 544.6.076.324.4 plasmachemical synthesis lithium-ion battery anode of lithium-ion battery silicon anode nanodispersed silicon powder https://engtech.spbstu.ru/article/2020.111.4/ 4_Ozerskoy.pdf

RAR RUS 53-61 Grigoriev Andrei Dmitryuk Artem CALCULATION OF TECHNOLOGY PARAMETERS OF ALUMINUM POWDER EXTRUSION An algorithm has been developed for calculating the extrusion force during the process of pressing briquettes of aluminum powder. The algorithm allows you to pre-determine the energy-power parameters of the process, especially at the initial stage: effort, power, speed. The initial parameters for the calculations are material characteristics: briquette density (bulk density), briquette dimensions; degree of deformation (drawing), deformation resistance depending on the strain rate and temperature; as well as geometric and speed parameters of the process: the type of pressing (direct or reverse), the dimensions of the press tool (length, diameter), the dimensions of the matrix (up to the size of the calibrating girdle), the friction coefficient (taking into account the lubricant for pressing), the speed of the press block. It is shown that the presence of unsteady pressing sections and the dependence of the resistance on the strain rate lead to process instability and, consequently, to the uneven properties of the resulting bars. However, the presented algorithm allows us to calculate and reduce this negative effect when using automation systems (stabilizing speed-force systems) with appropriate adjustment. 10.18721/JEST.26105 621.762:669.71:004.94 powder metallurgy extrusion aluminum technology simulation https://engtech.spbstu.ru/article/2020.111.5/ 5_Grigorev.pdf

RAR RUS 62-74 Konchus Darina Sivenkov Aleksei Mikhajlov Andrei Pryahin Eugene mthi@spmi.ru. THE LASER MARKING INFLUENCE ON THE STAINLESS STEEL CORROSION RESISTANCE The research describes to the corrosion resistance study of AISI 304 steel treated with a MiniMarker2 – M20A4 laser marking system. The steel was marked with a 35 × 35 mm QR code containing 305 typewritten characters. Samples were tested on stability and readability after exposure to acids and alkalis, various chemical potent household detergents and disinfectants. To assess the durability of the applied laser marking, the sample with the marking is exposed to boiling tap water at 100 ° C for 3 hours. The intercrystalline corrosion tendency was estimated. The tests for the intercrystalline corrosion resistance were carried out according to the AMU method without provoking heating for unstabilized steel (GOST 6032–2003) 10.18721/JEST.26106 620.193.6 Corrosion Resistant Steel laser marking QR-code intercrystalline corrosion pitting corrosion https://engtech.spbstu.ru/article/2020.111.6/ 6_Konchus.pdf

PER RUS 75-83 Morachevski Andrey morachevski@mail.ru DMITRI IVANOVICH MENDELEEV. 150 YEARS OF THE PERIODIC SYSTEM OF ELEMENTS 2019, the United Nations proclaimed the «International Year of the Periodic Table of the Chemical Elements». 150 years have passed since the discovery by the great Russian scientist D.I. Mendeleev of the Periodic Law and the Periodic System of Elements. The information on 63 elements available by that time (1869) was brought into a harmonious system and made it possible to predict the properties of a number of those elements that had not yet been discovered. D.I. Mendeleev himself spoke of his discovery as follows: «... The future does not threaten destruction with a periodic law, but only a superstructure and development are promised.» The superstructure turned out to be very significant – to date, the number of elements has reached 118, and the element that appeared in 1955 was called Mendeleev (Md, registered under number 101). Even during the life of the scientist, a number of predictions came true: gallium was discovered in 1875, scandium in 1879, and Germany in 1886. All of them were previously named because of their similarity with the known elements: ecaaluminium, ecabor and ecasilicium («eca» – from the Sanskrit word «one»), their properties were predicted and places were left in the periodic system of elements. The discovery of the predicted elements and the fact that the experimentally determined properties of the new elements coincided with the predicted ones led to the worldwide recognition of the Periodic Law. In 2007, at the International Materials Science Congress (TMS -2007), the Periodic System of Chemical Elements was named among the ten major achievements of mankind in the field of materials science and sciences, engaged in the development and study of the properties of new materials. 10.18721/JEST.26107 546.3 D.I. Mendeleev Periodic system of chemical elements Periodic law of D.I. Mendeleev Russian chemist periodic dependence https://engtech.spbstu.ru/article/2020.111.7/ 7_Morachevskiy.pdf

PER RUS 84-91 Shestakova Tatyana ENGINEER ALEXEY VASILIEVICH LAVROV The article is devoted to Alexey V. Lavrov, a graduate of the Leningrad Polytechnic Institute of 1926, a hydraulic engineer. Lavrov designed hydroelectric power stations and hydrotechnical constructions and conducted explorations on rivers of the North Caucasus, prepared a plan of its electrification, he went on the Caucasian complex expedition of the Council of the Academy of Sciences of the USSR for study of productive forces. He could not have escaped the political repressions of the 1930s. 10.18721/JEST.26108 627.8 A. V. Lavrov Polytechnic Institute hydraulic engineering hydroelectric power stations electrification of the North Caucasus https://engtech.spbstu.ru/article/2020.111.8/ 8_Shestakova.pdf