Global Energy

RAR RUS 7-20 6603036819 Peter the Great St. Petersburg Polytechnic University, Russia Titkov Vassiliy titkovprof@yandex.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Voloshin Kirill ON THE CHOICE OF OPTIMAL POWER DISTRIBUTION IN CABLE DUCT The possibility of increasing the transmitted energy through cable lines laid in a cable duct by optimizing power distribution is investigated. The thermal field of the cable block is analytically considered. A simple ratio is proposed to determine the current loading profile of the duct, guided by a homogeneous distribution of cable temperature. For cable ducts with a large proportion of disconnected cables or empty pipes, a method for optimizing load distribution in accordance with the theory of the planar potential problem is presented. In addition, the acceptable accuracy of the discrete source model for calculating temperatures in the cable duct in comparison with the FEM calculation is noted. This approach makes it possible to calculate the cable duct of any configuration and filling, including the joint placement of XLPE and PILC cables in the cable duct, which is currently an urgent task. 10.18721/JEST.29101 621.315 кабельный блок кабельные линии трубно-блочная канализация электроэнергии допустимый длительный ток пропускная способность https://engtech.spbstu.ru/article/2023.123.1/ Titkov%2C-Voloshin.pdf

REV RUS 21-79 Nazeeruddin Vasilopoulou Maria Perovskite Solar Cells . . https://engtech.spbstu.ru/article/2023.123.2/ Nasiruddin%2C-Vasilopulu.pdf

RAR RUS 80-95 Galerkin Yuriy galerkin@pef.spbstu.ru Drozdov Alexandr A_drozdi@mail.ru Marenina Lyubov' N. Sahranavard Mahdi Solovyeva Olga A. INFLUENCE OF HUB RATIO ON THE PARAMETERS AND KINEMATICS OF THE FLOW IN AN AXIAL COMPRESSOR SUPERSONIC STAGE Much attention is paid to improving the methods of gas-dynamic design of axial compressors. Variants of the supersonic stage of an axial compressor with different hub ratios and pre-swirling of the flow were subjected to computational analysis. All variants have the same mass flow rate, flow coefficient and outlet angles of the blades at the hub diameter. The analysis was carried out according to the program of primary design in a quasi-three-dimensional setting. The graphical representation shows the quantitative results of the influence of the hub ratio and of the flow swirl on the efficiency, the loading factor and the pressure ratio of the stage. An analysis of the flow structure and velocity triangles explains the reasons for the change in efficiency and loading factor. The dependences of the efficiency and the loading factor on the hub ratio and flow swirl are approximated by a system of algebraic equations. 10.18721/JEST.29103 621.515 axial compressor impeller hub ratio loading factor radial equilibrium flow swirl https://engtech.spbstu.ru/article/2023.123.3/ Galerkin%2C-Drozdov%2C-Marenina.pdf

RAR RUS 96-109 Bagan Steve Peter the Great St. Petersburg polytechnic university Kalimov Alexander APPLICATION OF THE FIREWORKS ALGORITHM FOR DESIGN OPTIMIZATION OF DOUBLE PANCAKE SUPERCONDUCTING INDUCTIVE ENERGY STORAGE DEVICE The article deals with optimization problem of double pancake coil design parameters, intended for superconducting magnetic energy storage system. The corresponding problem formulation involves the search for the maximum stored energy of magnetic field for fixed length of second generation superconducting tape at temperatures of 22° K and 77° K. The optimization method used is based on fireworks algorithm with an improved selection strategy for choosing intermediate solutions. The stored energy of the storage system is determined by jointly solving integral equation of magnetic field and the equation of critical state of superconducting material. A series of numerical experiments was carried out in order to compare the main characteristics of the proposed strategy for implementing the fireworks algorithm with alternative optimization technologies, including the traditional implementation of this method, as well as the genetic algorithm. 10.18721/JEST.29104 621.3.013.22 renewable energy second-generation high-temperature superconductors critical current superconducting magnetic energy storage fireworks optimization algorithm https://engtech.spbstu.ru/article/2023.123.4/ Bagan%2C-Kalimov.pdf

RAR RUS 110-117 Blinov Lev lnblinov@ftim.spbstu.ru Krylov Nikolay Polyakova Vera ON THE QUESTION OF A CHEMICAL SUBSTANCE, CHEMICAL COMPOUNDS AND NANOMATERIALS IN MODERN SCIENCE AND TECHNOLOGY The interpretations and definitions of such concepts and terms as "substance", "chemical substance", "compound", "chemical compound", "material", "chemical material", "nanomaterial" in modern chemistry, nanochemistry, nanotechnology are determined. The analysis of the system of concepts "substance-compounds-materials" is carried out, various aspects of the concept of "substance", its types and characteristics are considered. The concept of "materials" is interpreted, including in new sections of chemistry and other sciences (nanochemistry, nanotechnology). The areas and boundaries of their application and use in classical and theoretical chemistry, materials science, medicine, oncology, construction, glass science and other fields are considered. On the basis of a systematic and hierarchical approach, the possibilities and limitations of the application of the concepts of "chemical substance", "chemical compounds" and "nanomaterials" in modern science are shown. The "concept" and "term" are also analyzed. 10.18721/JEST.29105 54-3 substance chemical substance compound chemical compound materials chemical materials nanomaterials nanotechnology scope of application https://engtech.spbstu.ru/article/2023.123.5/ Blinov%2C-Krilov%2C-Polyakova.pdf

RAR RUS 118-128 Gorynin Vladimir z1dehy97@mail.wplus.net JSC "Atomproekt" Rogozhkin Vladimir Mikhailov Vladimir SuKhorukov Yuriy teploobmen@ckti.ru. Lanin Aleksandr Homenok Leinid Esin Sergey NATURAL FRESH WATER FOR SAUDI ARABIA An environmentally friendly turbo-condensate technology and the W-Condenser plant for large-scale production of natural fresh water of rain quality from the atmospheric air of the Red Sea of the Arabian Peninsula for the coastal cities of the Kingdom of Saudi Arabia are proposed. The principles of operation and characteristics of a condensate unit with a capacity of more than 4000 tons of fresh water per day, conditions for location on the sea coast, taking into account the climate and natural topography of the northwestern territory, are formulated to solve the urgent problem of supplying freshwater resources and ensuring sustainable development and landscaping of arid ecosystems of the city of the future under the Neom project. The W-Condenser plant uses practically unlimited and environmentally friendly natural atmospheric moisture of the Red Sea water area and a turbocompressor air cooling system during its adiabatic expansion with the formation of freshwater condensate, where the source of technological cold is electricity from various sources of Saudi Arabia. 10.18721/JEST.29106 621.319.4 environmentally friendly turbo-condensate technology and W-Condenser plant large-scale production of rain-quality natural fresh water atmospheric moisture of the air in the Red Sea freshwater supply Neom city https://engtech.spbstu.ru/article/2023.123.6/ Gorinin%2C-Rogozhkin%2C-Mihaylov.pdf

RAR RUS 129-138 Vasilyeva Elena Ivanov Afanasiy MATRIX–FIBER ADHESION ASSESSMENT USING THE ARDUINO ANALOG-TO-DIGITAL CONVERTER REMOTE CONTROL PLATFORM This paper considers two approaches to conducting tests to evaluate the basalt fiber–epoxy matrix interfacial adhesion using the Arduino analog-to-digital converter remote control platform. The approaches include the droplet detachment method from the fiber and the fiber–matrix detachment method. The results obtained in the two tests showed results comparable to those of other researchers. A variant of the device for determination of the fiber–matrix interface interaction parameters with the possibility of adjusting the loading parameters and loading zone is proposed. Thus, a device using Arduino analog-to-digital converter platform can be recommended for implementation for adhesion quality control of the fiber–epoxy matrix interface interaction. 10.18721/JEST.29107 620.179.4 adhesion interfacial interaction epoxy basalt fiber microplastic microprocessor https://engtech.spbstu.ru/article/2023.123.7/ Vasileva%2C-Ivanov.pdf

RAR RUS 139-156 Boldyrev Ilia Lihachev Alexey Narykova Maria Levin Aleksandr Prasolov Nikita Sokolov Roman Kardashev Boris Kadomtsev Andrej Brunkov Pavel Sultanov Makhsud Strizhichenko Alexander INFLUENCE OF SERVICE LIFE ON THE MICROSTRUCTURE AND ELASTIC-PLASTIC PROPERTIES OF STEEL-ALUMINUM WIRE AC120/19 OVERHEAD POWER LINES The paper studies the influence of the service life on the microstructural and elastic-plastic properties of individual aluminum and steel wires depending on their location along the cross section of the AC120/19 steel-aluminum wire. It was found that aluminum wires in the outer layer, after long-term operation of 33 years, show integral density significantly lower than in the inner layer, which is associated with a significant effect of atmospheric conditions on the degradation of the surface of single wires. In new unused wires, all aluminum wires are characterized by a higher integral density, the same for all layers. The integral density of steel core wires in contact with aluminum wires, after long-term operation, shows values that are lower than the density of the central wire of the steel core that does not have contact with aluminum wires. In contrast to aluminum wires from the inner layer, aluminum wires from the outer layer in contact with the surrounding atmosphere have reduced values of Young’s modulus compared to a new unused cable. In comparison with the new cable, a decrease in Young’s modulus and an increase in amplitude-independent decrement values were found for steel wires from the cable core. 10.18721/JEST.29108 538.9 EBSD elastic-plastic properties microstructure steel-aluminum wires high-voltage power lines. https://engtech.spbstu.ru/article/2023.123.8/ Lihachev%2C-Narikova%2C-Levin.pdf

RAR RUS 157-169 Evgeniy Evgeniy Akhmetova Gulzhainat Volokitina Irina THEORETICAL STUDY OF THE FORCE PARAMETERS OF ECAP-LINEX COMBINED PROCESS The paper presents theoretical studies of a new deformation process combining the stages of equal-channel angular pressing and the Linex scheme. To analyze the resulting deformation forces, the stages of pressing in a matrix and compression by a chain conveyor were separately considered. Equations for determining the forces acting on the drive pulley, ECA matrix and the chain element link were obtained. A trial calculation and comparative analysis with the previously known rolling-ECAP process showed that the new ECAP-Linex process enables a stable deformation process with lower forces and a smaller channel junction angle in the matrix. Verification of the obtained values by equations using FEM computer simulation in the Deform program was performed. Comparison of values showed that the force values in the calculation and simulation have a high level of convergence. In all three considered details the difference value did not exceed 3%. The materials of the article were presented at the International Scientific and Practical Conference "Advanced Engineering Technologies AET 2022" held in St. Petersburg on November 21–25, 2022. 10.18721/JEST.29109 621.771.014 severe plastic deformation equal-channel angular pressing Linex combined process force equation simulation https://engtech.spbstu.ru/article/2023.123.9/ Panin%2C-Ahmetova%2C-Volokitina.pdf

RAR RUS 170-180 Teplukhina Irina Batasov Aleksandr Ovanesyan Konstantin Vologjanina Svetlana Grechikhina Irina Anisimova Victoria FEATURES OF AUSTENITE DECAY AND PATTERNS OF STRUCTURE FORMATION IN LOW-ALLOY STEEL GRADE 09G2SA-A UNDER CONTINUOUS COOLING The paper presents the results of a study of structure formation during continuous cooling in low-alloy steel grade 09G2SA-A used in the production of large-sized forgings for power engineering. Based on the results of dilatometric analysis, studies of changes in the hardness and structure of steel after cooling at different rates, a thermokinetic diagram (TKD) was constructed for the decomposition of supercooled austenite. The TKD is the basic element for creating a heat treatment technology for large-sized forgings that provides uniform mechanical properties due to controlled management of structure formation processes in the entire volume of the hardened workpiece. The studies established the interval of cooling rates, which ensures the absence of such structural components as pearlite or high-temperature bainite in the steel structure after hardening to prevent their adverse effect on the resistance to brittle fracture of the steel. The materials of the article were presented at the International Scientific and Practical Conference "Advanced Engineering Technologies AET 2022" held in St. Petersburg on November 21–25, 2022. 10.18721/JEST.29110 669-156.3 low-carbon low-alloy steel austenite decay cooling rate phase transformations structure thermokinetic diagram https://engtech.spbstu.ru/article/2023.123.10/ Tepluhina%2C-Batasov%2C-Ovanesyan.pdf

RAR RUS 181-189 Prilipko Sergey Linnik Dmitriy Kudryavtsev Yuriy Belichko Danil Volkova Galina Glazunova Valentina Burkhovetsky Valeriy POLYMER-CERAMIC COMPOSITE BASED ON POROUS AL2O3 Ceramic samples with open porosity were manufactured from powders of various sizes and shapes. The porosity value varied within 20–50%, while the bending strength reached 130 MPa. The influence of the morphology of Al2O3 nanopowders on the structure and strength of porous ceramics made from them was studied, and the possibility of increasing the specific strength by filling open pores with epoxy resins was established. A method for obtaining composite materials with low specific gravity (2–2.5 g/cm3) was developed. The objective of the experiment was to obtain a composite in which each component would have a continuous structure. Samples of polymer-ceramic composites with an Al2O3 matrix were made, combining the advantages of both materials, which led to an increase in specific strength. The materials of the article were presented at the International Scientific and Practical Conference "Advanced Engineering Technologies AET 2022" held in St. Petersburg on November 21–25, 2022. 10.18721/JEST.29111 539.422.5, 620.174 polymer-ceramic composite aluminum oxide epoxy resins strength density https://engtech.spbstu.ru/article/2023.123.11/ Prilipko%2C-Linnik%2C-Kudryavtsev.pdf