Global Energy

RAR RUS 7-17 Peter the Great St. Petersburg polytechnic university Kalimov Alexander Bagan Steve Govor Vladislav MODELING OF THE SUPERCONDUCTING COIL CRITICAL STATE IN THE INDUCTIVE ENERGY STORAGE SYSTEMS A new method for determining critical currents in coils made of second-generation superconducting tapes is considered in the paper. The proposed approach is based on the joint solution of the integral equation of the electromagnetic field and the equation of state of the superconductor material, the critical current density in which is determined on the basis of the modified anisotropic Kim–Anderson model. Discretization of the equation system has been done by the collocation method. By means of the developed algorithm for solving the derived equations system, we calculated the critical current in coils used in inductive energy storage systems. A series of numerical experiments revealed the effect of significant degradation of the critical current in the coils compared to the declared parameters obtained for short samples of a superconducting tape 10.18721/JEST.28301 621.3.013.22 renewable energy sources superconducting energy storage critical current critical state model second generation superconductors https://engtech.spbstu.ru/article/2022.121.1/ Kalimov%2C-Bagan%2C-Govor.pdf

RAR RUS 18-30 Busarov Sergei S. Vansovich K.A. EVALUATION OF FATIGUE FAILURE OF A CYLINDER OF A LOW-FLOWS SILENT-SPEED RECIPROCATING COMPRESSOR The article evaluates the fatigue loading resource of the low-speed stage cylinder of a long-stroke piston unit when loaded by the internal pressure of the working medium in the injection zone. For low-speed compressor stages, an urgent task is to study the behavior of structures during long-term operation, since this machine has not been sufficiently studied and the purpose of its creation is an increased resource compared to existing multi-stage analogues. The results of the analysis of the operation of the compressor unit, obtained in the ANSYS Workbench program, make it possible to evaluate the influence of the properties of the material and design of the cylinder, as well as the characteristics of its loading on fatigue strength. The conducted research allowed us to create a general approach to the design of piston stages of units under the conditions of operational loads, which makes it possible to create piston stages with a given service life. 10.18721/JEST.28302 621.512.2 low-speed piston unit; stress-strain state; endurance limit of the material; fatigue strength; residual resource https://engtech.spbstu.ru/article/2022.121.2/ Busarov%2C-Vansovich.pdf

RAR RUS 31-40 Gulov Aleksandr Kolychev Aleksandr Kosorukov Anton kosorukov_anton@inbox.ru THE USE OF SURGE ARRESTERS ON SECTIONS OF 110 KV OVERHEAD LINES WITHOUT A GROUND WIRE The use of surge arresters on overhead lines instead of ground wire is a common practice. Operational experience shows that the number of damaged protective devices increases on such lines. It’s important to choose the right energy discharge capability to prevent the failure of surge arresters due to a lightning strike. Therefore, the study of the energy characteristics of surge arresters remains relevant. The article considers a special case of the intersection of two overhead lines. In that situation ground wire is removed from the lower line in the intersection span. Surge arresters are installed on the upper phases in that span. The amount of surge arrester discharge energy was determined as a function of the parameters of the lightning current pulse and the parameters of the overhead line. The following values were varied: the front and amplitude of the lightning current pulse, the tower footing resistance, the number of insulators in the string 10.18721/JEST.28303 621.315.1 transmission line surge arrester lightning protection ATP discharge energy https://engtech.spbstu.ru/article/2022.121.3/ Gulov%2C-Kolichev%2C-Kosorukov(1).pdf

RAR RUS 41-52 Balakhonov Denis Nikolenko Sergej Makarov Ivan INVESTIGATION OF TUNGSTEN BORIDE STRUCTURES OBTAINED IN PLASMA-CHEMICAL SYNTHESIS FROM A MINERAL TUNGSTEN-CONTAINING CONCENTRATE The article presents an analysis of the results of experiments obtained in the process of plasma-chemical synthesis, in a high-frequency plasma flow, of tungsten borides of the W-B system. A method for producing a mixture based on a multicomponent mineral oxide-containing concentrate of the Far East region and boric acid (H3BO3) is described. A schematic diagram of a prototype plasma reactor for the formation of the tungsten boride seed phase in a protective argon medium is presented. The results of the analysis of the chemical and physical properties of tungsten borides of the W-B system obtained under local high-energy exposure to a plasma flow of 10–100 kW/cm2 are presented. Tungsten borides were forming from a multicomponent oxide-containing mineral raw material in one technological cycle. The chemical and phase composition of the synthesis products, including compounds of the W-B system, was determined. The methods of X-ray phase and spectral microanalysis, as well as scanning electron microscopy, were used for identification. Some issues of the nature of the processes and properties of the materials obtained during high-temperature plasma synthesis, the morphology of genesis and formation of boride crystals are considered. During laboratory testing of the obtained material samples, the presence of tungsten borides of the W-B system was confirmed and the presence of phase compounds – WB, WB2 and W2B was established. The prospects of using plasma technologies for the formation of refractory and wear-resistant compounds based on boron and tungsten have been confirmed. 10.18721/JEST.28304 621.762.2+661.878 scheelite concentrate tungsten boride plasma plasma-chemical synthesis high-density energy https://engtech.spbstu.ru/article/2022.121.4/ Balahonov%2C-Nikolenko%2C-Makarov.pdf

RAR RUS 53-64 Vasilyeva Elena Ivanov Afanasiy Struchov Nikolay Kychkin Anatoliy COMPARISON OF WETTABILITY OF FIBERGLASS PLASTIC WITH ETHYL ALCOHOL AND KEROSENE TO DETERMINE OPEN POROSITY Two approaches to determining the open porosity of fiberglass plastic by hydrostatic weighing with and without considering the pore volume and densities of the sample and working fluids, polar ethyl alcohol and non-polar kerosene, have been evaluated. Surface tension and work of adhesion to the fiberglass surface were chosen as evaluation parameters. Surface hydrophobicity, determination of surface tension energy and adhesion work of wetting liquid to the fiberglass plastic surface were evaluated by the edge angle of wetting drops of working fluids. Distilled water was used as a reference for comparison. The evaporation rate and permeation capacity of ethyl alcohol showed significantly higher values based on the measurement of the wetting edge angle. At the same time, wetting of the fiberglass surface was faster when non-polar kerosene was used as the working fluid. The data of the wetted edge angle has been used to determine the adhesion work on the fiberglass surface, taking into account the perfectly smooth surface. According to the data obtained, kerosene demonstrated excellent wetting ability, relatively low volatility (evaporation) with high permeability. It should be kept in mind that when calculating the open porosity of a sample of polymer composite material, the working fluid should be selected based on the wettability, surface polarity of the studied sample, volatility and non-toxicity. At the same time to measure the open porosity it is necessary to keep in mind that the work spent on adhesion with a polar surface will be higher when using polar ethyl alcohol as a wetting liquid. 10.18721/JEST.28305 691.175.3 composite material epoxy resin ethyl alcohol kerosene open porosity surface tension edge wetting angle https://engtech.spbstu.ru/article/2022.121.5/ Vasileva%2C-Ivanov%2C-Struchkov%2C-Kichkin.pdf

RAR RUS 65-74 Goncharenko Dmitry Kiryanov Andrey Kochemirovskaia Svetlana EFFECT OF LASER TREATMENT OF ALUMINUM ALLOY SURFACE ON METAL-POLYMER ADHESION This paper investigates the effect of laser surface treatment on the adhesion between D16AM aluminum alloy and thermoplastic polyurethane. By measuring the shear strength, we showed the effect of: preliminary surface cleaning of aluminum alloy; chemical etching and electrochemical anodizing; a combination of etching or anodizing methods with laser surface treatment. High power density in laser treatment allows not only modifying the surface, but also cleaning it from an organic contaminant. It is shown that several types of combined treatment of metal allow obtaining the shear strength above the yield strength of the polymer and is no less than 50%. In addition, the work shows that the effect of the sequence of laser treatment allows increasing the shear strength by 10%. 10.18721/JEST.28306 678 adhesion laser surface treatment fiber metal laminate thermoplastic elastomer etching anodizing https://engtech.spbstu.ru/article/2022.121.6/ Goncharenko%2C-Kiryanov%2C-Kochemirovskaya.pdf

RAR RUS 75-84 Yunusov Firuz Larionova Tatiana D-3061-2012 7003918449 0000-0001-9623-4001 Peter the Great St. Petersburg Polytechnic University, Russia Tolochko Oleg

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

INFLUENCE OF ALLOYING ELEMENTS ON THE STRUCTURE AND PROPERTIES OF ALUMINUM-BASED COMPOSITES WITH CARBON NANOPARTICLES Aluminum-fullerene soot composite materials with subsequent alloying were obtained by mechanical milling followed by hot press compacting. The influence of the alloying on the structure and properties of the composite materials is shown. The addition of copper and nickel led to denser structure and increased hardness, and the addition of titanium and zinc had almost no effect on the structure and hardness of the composite. The tribological properties of the aluminum-fullerene soot composites with alloying are investigated and compared with the results of the aluminum-fullerene soot composites obtained under similar conditions. The morphology of the wear surfaces was examined using scanning electron microscopy (SEM). The addition of copper and nickel resulted in a change in the friction mechanism from oxidation-adhesion with micro-cutting to oxidation with micro-cutting. 10.18721/JEST.28307 621.2.082.18 mechanical milling composite material alloying element mechanical properties tribology friction mechanism https://engtech.spbstu.ru/article/2022.121.7/ Yunusov%2C-Larionova%2C-Tolochko.pdf