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Готові списки джерел за темами / Turbomachines Design and construction / Статті в журналах

Щоб переглянути інші типи публікацій з цієї теми, перейдіть за посиланням: Turbomachines Design and construction.

Статті в журналах з теми "Turbomachines Design and construction"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 31 липня 2025

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1

Żywica, Grzegorz, Tomasz Kaczmarczyk, Eugeniusz Ihnatowicz, Paweł Bagiński, and Artur Andrearczyk. "Design and Manufacturing of Micro-Turbomachinery Components with Application of Heat Resistant Plastics." Mechanics and Mechanical Engineering 22, no. 2 (2020): 649–60. http://dx.doi.org/10.2478/mme-2018-0051.

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AbstractThe article discusses issues associated with the use of modern plastics for the construction of high-speed fluid-flow machines. Currently available plastics exhibit high chemical resistance as well as dimensional and shape stability across a wide temperature range. This allows them to be used for manufacturing components of micro turbomachinery, thereby reducing production time and costs. This article discusses the criteria for the selection of plastics suitable for a particular machine, namely micro turbogenerator operating in the organic Rankine cycle (ORC). In addition to the initia

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2

Sazonov, Yuri A., Mikhail A. Mokhov, Inna V. Gryaznova, et al. "Computational Fluid Dynamics (CFD) Simulation of Mesh Jet Devices for Promising Energy-Saving Technologies." Civil Engineering Journal 8, no. 12 (2022): 2749–67. http://dx.doi.org/10.28991/cej-2022-08-12-06.

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This paper discusses the development of mesh jet devices for hybrid turbines, including developing Euler's ideas, and considers a new patented version of a mesh jet device designed to create guiding devices for turbines. The research methods are based on simulations using CFD and additive technologies. An intermediate conclusion is that a new scientific direction for the study and creation of mesh jet control systems has been formed as part of developing Euler's ideas. Calculation methods showed possible improvements in the performance of jet devices, including the use of curved tubes proposed

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3

Mrzljak, Vedran, Igor Poljak, Maro Jelić, and Jasna Prpić-Oršić. "Thermodynamic Analysis and Improvement Potential of Helium Closed Cycle Gas Turbine Power Plant at Four Loads." Energies 16, no. 15 (2023): 5589. http://dx.doi.org/10.3390/en16155589.

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This paper presents thermodynamic and improvement potential analyses of a helium closed-cycle gas turbine power plant (Oberhausen II) and dominant plant components at four loads. DESIGN LOAD represents optimal operating conditions that cannot be obtained in exploitation but can be used as a guideline for further improvements. In real plant exploitation, the highest plant efficiency is obtained at NOMINAL LOAD (31.27%). Considering all observed components, the regenerator (helium-helium heat exchanger) is the most sensitive to the ambient temperature change. An exact comparison shows that the e

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4

Sazonov, Yuri Appolonievich, Mikhail A. Mokhov, Inna Vladimirovna Gryaznova, et al. "Designing Mesh Turbomachinery with the Development of Euler’s Ideas and Investigating Flow Distribution Characteristics." Civil Engineering Journal 8, no. 11 (2022): 2598–627. http://dx.doi.org/10.28991/cej-2022-08-11-017.

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This research discusses developing an Euler turbine-based hybrid mesh turbomachinery. Within the framework of mechanical engineering science, turbomachinery classification and a novel method for mesh turbomachinery design were considered. In such a turbomachine, large blades are replaced by a set of smaller blades, which are interconnected to form flow channels in a mesh structure. Previous studies (and reasoning within the framework of inductive and deductive logic) showed that the jet mesh control system allows for operation with several flows simultaneously and provides a pulsed flow regime

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5

SAKAGUCHI, Daisaku. "Design Optimization of Turbomachinery by Artificial Neural Networks as a Meta-model." Proceedings of Mechanical Engineering Congress, Japan 2022 (2022): W052–01. http://dx.doi.org/10.1299/jsmemecj.2022.w052-01.

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6

Silva, E. Raimunda da, R. G. R. Camacho, and N. M. Filho. "Global optimization based on metamodel construction app lied to design axial turbomachinery cascades using CFD." IOP Conference Series: Earth and Environmental Science 12 (August 1, 2010): 012095. http://dx.doi.org/10.1088/1755-1315/12/1/012095.

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7

Demelio, G. P., SM Camporeale, A. Castellano, F. Cupertino, and M. Torresi. "Design and construction of an offshore diffuser augmented wind turbine with a high efficiency alternator." IOP Conference Series: Materials Science and Engineering 1214, no. 1 (2022): 012030. http://dx.doi.org/10.1088/1757-899x/1214/1/012030.

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Abstract This paper describes the design and the assembly of a new type of a ducted wind turbine with an electric power generator adopting permanent high coercive magnets embedded in the peripheral ring of the rotor. The nominal power is 20 kW, and the maximum diameter of the external duct is 9 meters. The project has been carried out within the Marine Energy Laboratory (MEL) funded by the Italian Ministry for Education, University and Research (MIUR) and collects the most advanced technologies of naval maritime engineering and combines them with energy and turbomachinery technologies. The pre

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8

Kidd, S. R., J. S. Barton, P. Meredith, J. D. C. Jones, M. A. Cherrett, and K. S. Chana. "A Fiber Optic Probe for Gas Total Temperature Measurement in Turbomachinery." Journal of Turbomachinery 117, no. 4 (1995): 635–41. http://dx.doi.org/10.1115/1.2836582.

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This paper describes the design, operation, construction, and demonstration of a new type of high-bandwidth unsteady temperature sensor based on fiber optics, and capable of operating in a high-speed multistage research compressor with flow representative of jet engine conditions. The sensing element is an optical coating of zinc selenide deposited on the end of an optical fiber. During evaluation in aerodynamic testing, a 1 K gas temperature resolution was demonstrated at 9.6 kHz and an upper bandwidth limit of 36 kHz achieved.

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9

Korakianitis, T. "Prescribed-Curvature-Distribution Airfoils for the Preliminary Geometric Design of Axial-Turbomachinery Cascades." Journal of Turbomachinery 115, no. 2 (1993): 325–33. http://dx.doi.org/10.1115/1.2929238.

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Blade surfaces with continuous curvature and continuous slope of curvature minimize the possibility of flow separation, lead to improved blade designs, and reduce the direct and inverse blade-design iterations for the selection of isolated airfoils and gas-turbine-blade cascades. A method for generating two-dimensional blade shapes is presented. The geometry near the trailing edge is specified by an analytic polynomial, the main portion of the blade surface is mapped using as input a prescribed surface-curvature distribution, and the leading edge is specified as a thickness distribution added

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10

Korakianitis, T. "Hierarchical Development of Three Direct-Design Methods for Two-Dimensional Axial-Turbomachinery Cascades." Journal of Turbomachinery 115, no. 2 (1993): 314–24. http://dx.doi.org/10.1115/1.2929237.

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The direct and inverse blade-design iterations for the selection of isolated airfoils and gas turbine blade cascades are enormously reduced if the initial blade shape has performance characteristics near the desirable ones. This paper presents the hierarchical development of three direct blade-design methods of increasing utility for generating two-dimensional blade shapes. The methods can be used to generate inputs to the direct- or inverse-blade-design sequences for subsonic or supersonic airfoils for compressors and turbines, or isolated airfoils. The examples included for illustration are

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11

Siddappaji, Kiran, and Mark G. Turner. "Versatile Tool for Parametric Smooth Turbomachinery Blades." Aerospace 9, no. 9 (2022): 489. http://dx.doi.org/10.3390/aerospace9090489.

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Designing blades for efficient energy transfer by turning the flow and angular momentum change is both an art and iterative multidisciplinary engineering process. A robust parametric design tool with few inputs to create 3D blades for turbomachinery and rotating or non-rotating energy converters is described in this paper. The parameters include axial–radial coordinates of the leading/trailing edges, construction lines (streamlines), metal angles, thickness-to-chord ratio, standard, and user-defined airfoil type among others. Using these, 2D airfoils are created, conformally mapped to 3D strea

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12

Morgese, Gaetano, Francesco Fornarelli, Paolo Oresta, et al. "Fast Design Procedure for Turboexpanders in Pressure Energy Recovery Applications." Energies 13, no. 14 (2020): 3669. http://dx.doi.org/10.3390/en13143669.

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Sustainable development can no longer neglect the growth of those technologies that look at the recovery of any energy waste in industrial processes. For example, in almost every industrial plant it happens that pressure energy is wasted in throttling devices for pressure and flow control needs. Clearly, the recovery of this wasted energy can be considered as an opportunity to reach not only a higher plant energy efficiency, but also the reduction of the plant Operating Expenditures (OpEx). In recent years, it is getting common to replace throttling valves with turbine-based systems (tuboexpan

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13

Barsi, Dario, Marina Ubaldi, Pietro Zunino, and Robert Fink. "Optimized Design of a Novel Hydraulic Propeller Turbine for Low Heads." Designs 5, no. 1 (2021): 20. http://dx.doi.org/10.3390/designs5010020.

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In the present paper, an optimized design procedure capable of providing the geometry of a high efficiency compact hydraulic propeller turbine for low head is proposed and developed. The turbine preliminary design is based on fundamental turbomachinery mean-line equations and on the employment of statistical correlations, which relate the main geometrical parameters to the fundamental design parameters. The first obtained geometry represents the starting point of an automated aerodynamic single point optimization procedure based on a genetic algorithm generating and updating a wide database of

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14

Popova, Diana, Denis Popov, and Nikita Samoylenko. "INVESTIGATION OF THE GRID MODEL AND TURBULENCE MODEL PARAMETERS INFLUENCE ON QUALITY OF TURBINE ROTOR BLADE TIP CLEARANCE AREA AERODYNAMIC PROCESSES MODELING." Perm National Research Polytechnic University Aerospace Engineering Bulletin, no. 66 (2021): 67–78. http://dx.doi.org/10.15593/2224-9982/2021.66.07.

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Aerodynamic processes mathematical modeling is carried out using numerical methods. Now the level of development of software numerical methods of three-dimensional gas-dynamic modeling of processes in turbomachinery makes it possible to determine with high accuracy the main characteristics of units at the design stage. It significantly reduces the time and cost of production. This article proposes a methodology for installation and improving the mathematical and grid model of HPT rotor blade to improve the quality of three-dimensional modeling. Aerodynamic processes mathematical modeling in ai

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15

Licheri, Fabio, Tiziano Ghisu, Francesco Cambuli, Pierpaolo Puddu, and Mario Carta. "Review of Experimental Investigations on Wells Turbines for Wave Energy Conversion." Energies 18, no. 12 (2025): 3035. https://doi.org/10.3390/en18123035.

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Wells turbines are one of the most attractive types of rotating machines installed in Oscillating Water Column (OWC) devices, owing to their simplicity of construction and reliability. Their unconventional design, with symmetrical blades staggered orthogonally with respect to the axis of rotation, simultaneously represents one of the main strengths and weaknesses of the turbine, and makes their aerodynamic behavior complex and significantly different from that of other types of machines. The importance of numerical analyses in explaining the physics behind the Wells rotor operation has signifi

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16

Ainsworth, R. W., J. L. Allen, and J. J. M. Batt. "The Development of Fast Response Aerodynamic Probes for Flow Measurements in Turbomachinery." Journal of Turbomachinery 117, no. 4 (1995): 625–34. http://dx.doi.org/10.1115/1.2836581.

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The advent of a new generation of transient rotating turbine simulation facilities, where engine values of Reynolds and Mach number are matched simultaneously together with the relevant rotational parameters for dimensional similitude (Dunn et al., 1988; Epstein and Guenette, 1984; Ainsworth et al., 1988), has provided the stimulus for developing improved instrumentation for investigating the aerodynamic flows in these stages. Much useful work has been conducted in the past using hot-wire and laser anemometers. However, hot-wire anemometers are prone to breakage in the high-pressure flows requ

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17

Son, Seongmin, Yongju Jeong, Seong Kuk Cho, and Jeong Ik Lee. "Development of supercritical CO2 turbomachinery off-design model using 1D mean-line method and Deep Neural Network." Applied Energy 263 (April 2020): 114645. http://dx.doi.org/10.1016/j.apenergy.2020.114645.

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18

Wang, Yuqi, Qiuwan Du, Yunzhu Li, Di Zhang, and Yonghui Xie. "Field reconstruction and off-design performance prediction of turbomachinery in energy systems based on deep learning techniques." Energy 238 (January 2022): 121825. http://dx.doi.org/10.1016/j.energy.2021.121825.

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19

Du, Qiuwan, Like Yang, Liangliang Li, Tianyuan Liu, Di Zhang, and Yonghui Xie. "Aerodynamic design and optimization of blade end wall profile of turbomachinery based on series convolutional neural network." Energy 244 (April 2022): 122617. http://dx.doi.org/10.1016/j.energy.2021.122617.

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20

Yokota, Jeffrey W., and Adam J. Medd. "Convergence Acceleration of an Inverse Design Technique for Constructing Turbomachinery Cascades." AIAA Journal 38, no. 10 (2000): 1983–85. http://dx.doi.org/10.2514/2.854.

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21

Yokota, Jeffrey W., and Adam J. Medd. "Convergence acceleration of an inverse design technique for constructing turbomachinery cascades." AIAA Journal 38 (January 2000): 1983–85. http://dx.doi.org/10.2514/3.14637.

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22

Tiwari, Ravi Nath, Alberto Traverso, and Federico Reggio. "Performance assessment of a reversible Tesla machine." E3S Web of Conferences 414 (2023): 03002. http://dx.doi.org/10.1051/e3sconf/202341403002.

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It is well known that bladeless or Tesla turbomachinery, which was invented by Nikola Tesla in 1913, has several distinct features, such as reversibility of operation, which includes expander as well as compressor operation, just by reversing the rotational speed, provided that the statoric channels are purposely designed. Despite their potential application to a variety of fields, such as energy harvesting, automotive, light aircraft, and food processing, especially for low volumetric flows, Tesla machines have not found yet a specific market niche. In fact, at small size, it is estimated tha

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23

Repetckii, Oleg, and Hoang Dinh Cuong. "RESEARCHING WAYS TO INCREASE THE RESOURCE CHARACTERISTICS OF RADIAL TURBOMACHINES BY MISTUNING OF GEOMETRIC AND MECHANICAL PARAMETERS." Perm National Research Polytechnic University Aerospace Engineering Bulletin, no. 76 (2024): 15–29. http://dx.doi.org/10.15593/2224-9982/2024.76.02.

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At present computer prediction of the actual resource and evaluation of the strength rotor constructions are one of the main direction of research in world science in the creation of new turbomachines. The complexity of assessing the strength and operational reliability of radial rotors turbomachines is associated with the presence of highly loaded elements in them and the variety of their geometric shapes. But in many scientific papers, both in Russia and in other countries, it is noted that there is practically no analysis of the sensitivity vibrations of turbomachine rotors, taking into acc

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24

Raheel, Muhammad M., and Abraham Engeda. "Systematic Design Approach for Radial Blade Regenerative Turbomachines." Journal of Propulsion and Power 21, no. 5 (2005): 884–92. http://dx.doi.org/10.2514/1.1426.

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25

Kim, Jun-Seong, You-Taek Kim, and Do-Yeop Kim. "Preliminary Design and Blade Optimization of a Two-Stage Radial Outflow Turbine for a CO2 Power Cycle." Energies 15, no. 17 (2022): 6240. http://dx.doi.org/10.3390/en15176240.

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Recently, the CO2 power cycle has attracted attention because of tightening environmental regulations. The turbine is a factor that greatly affects the efficiency of the cycle. The radial outflow turbine is a turbomachine with the various advantages of an axial flow turbine and a radial inflow turbine, but the design theory for the turbine is uncertain. In this study, a preliminary design algorithm for a radial outflow turbine with a multi-stage configuration is presented. To verify the preliminary design algorithm, a preliminary design for a two-stage radial outflow turbine for a CO2 power cy

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26

Kovář, Patrik, Adam Tater, Pavel Mačák, and Tomáš Vampola. "Searching for the Most Suitable Loss Model Set for Subsonic Centrifugal Compressors Using an Improved Method for Off-Design Performance Prediction." Energies 14, no. 24 (2021): 8545. http://dx.doi.org/10.3390/en14248545.

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This work investigates loss model sets based on empirical loss correlations for subsonic centrifugal compressors. These loss models in combination with off-design performance prediction algorithms make up an essential tool in predicting off-design behaviour of turbomachines. This is important since turbomachines rarely work under design conditions. This study employs an off-design performance prediction algorithm based on an iterative process from Galvas. Modelling of ten different loss mechanisms and physical phenomena is involved in this approach and is thoroughly described in this work. Geo

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27

Shang, Peng, Ying Zhan, Sheng Feng, Jian Zhou, and Lie Yu. "Exact Solution of High-Speed Couplings for Interference Fits." Advanced Materials Research 744 (August 2013): 180–84. http://dx.doi.org/10.4028/www.scientific.net/amr.744.180.

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High-speed couplings are the key parts of micro-turbomachinerys. They are assembled to shafts by interference fits, which can transfer large torque, are easy to produce and offer significant cost advantages. Considering of the influences of the torque, rotational speed and temperature variation, the interference fits between couplings and shafts have to be analyzed accurately in order to save the construction cost and reducing risk of invalidation accidents. In this paper, a model of the interference fit between a coupling and a shaft is developed to study the determine parameters of the inter

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28

Omidi, Mohammad, Shu-Jie Liu, Soheil Mohtaram, Hui-Tian Lu, and Hong-Chao Zhang. "Improving Centrifugal Compressor Performance by Optimizing the Design of Impellers Using Genetic Algorithm and Computational Fluid Dynamics Methods." Sustainability 11, no. 19 (2019): 5409. http://dx.doi.org/10.3390/su11195409.

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It has always been important to study the development and improvement of the design of turbomachines, owing to the numerous uses of turbomachines and their high energy consumption. Accordingly, optimizing turbomachine performance is crucial for sustainable development. The design of impellers significantly affects the performance of centrifugal compressors. Numerous models and design methods proposed for this subject area, however, old and based on the 1D scheme. The present article developed a hybrid optimization model based on genetic algorithms (GA) and a 3D simulation of compressors to exa

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29

Epple, Ph, F. Durst, and A. Delgado. "A theoretical derivation of the Cordier diagram for turbomachines." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 2 (2010): 354–68. http://dx.doi.org/10.1243/09544062jmes2285.

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The design of high-efficiency fans is often based on the experience of the designer. In order to determine its main dimensions, fan designers use the Cordier diagram. For a given operating point (i.e. flowrate and pressure, and a rotating speed), the optimum diameter of high-efficiency fans can be found in the Cordier diagram. The Cordier diagram is an empirical diagram based on measurements. It delivers a relation between flowrate, pressure, rotating speed, and diameter. However, the Cordier diagram does not provide any information on the blade shape (i.e. the angles and the blade width). In

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30

Brighenti, Attilio, Davide Duranti, and Debora Quintabà. "TGSim Plus™—Real-Time Dynamic Simulation Suite of Gas Turbine Systems for the MATLAB®/Simulink® Environment." International Journal of Turbomachinery, Propulsion and Power 5, no. 3 (2020): 24. http://dx.doi.org/10.3390/ijtpp5030024.

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Dynamic simulation of turbomachinery by Hardware in the Loop (HIL) real-time systems has become an essential practice, due to the high cost of real equipment testing and the need to verify the control and diagnostic systems’ reaction to emergency situations. The authors developed a full model of a power generation Gas Turbine Plant, including liquid and gaseous auxiliaries, and the electrical generator and starter motor, integrated in a MATLAB®/Simulink® simulation suite: TGSim Plus™. This allows assembling models of various gas turbine (GT) architectures by customised Simulink® library blocks

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31

Bondar, V. S., D. A. Alkhimov, A. I. Fakeev, Y. M. Temis, D. A. Yakushev, and A. V. Pestov. "Computer-aided design of gas turbine engines rotors." Izvestiya MGTU MAMI 9, no. 1-4 (2015): 10–20. http://dx.doi.org/10.17816/2074-0530-67096.

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The technology of the optimal design when designing the structure of the rotor disc for turbomachines is showed. The features of the organization of computer-aided design of gas turbine engine rotor are considered. The calculations of gas turbine engine rotor parts optimal form were made. Structural optimization (shape optimization) was applied to optimal design of compressor disk depending on various factors of loading and optimization criteria.

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32

Makarov, Nikolai. "Mathematical model of jet control of adaptability of mine turbomachines." E3S Web of Conferences 177 (2020): 05008. http://dx.doi.org/10.1051/e3sconf/202017705008.

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Achieving synergies from high-tech industries in combination with environmental technologies of innovative subsurface use is possible only on the path to the formation of a qualitatively new approach to creation of energy-efficient technologies including assistive technologies. The lack of adaptability of turbomachines providing industrial safety by more than 15% increases the cost of production of mining and oil and gas complexes of the Russian Federation, reducing their competitiveness due to their low energy efficiency. An equation is derived in the article for calculating the circulation o

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33

Lu, Kun-Hsien, Hsiao-Wei D. Chiang, and Pei-Jen Wang. "Sensitivity Analysis of Transcritical CO2 Cycle Performance Regarding Isentropic Efficiencies of Turbomachinery for Low Temperature Heat Sources." Energies 15, no. 23 (2022): 8868. http://dx.doi.org/10.3390/en15238868.

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The transcritical CO2 (T-CO2) power cycle using low temperature waste heat is a promising technique for energy saving and environmental protection. However, according to the literature, there is no commercialized unit in service yet. This study provides developers a reference to shorten the design phase of the T-CO2 cycle commercialization process. A sensitivity analysis of the system performance, i.e., thermal efficiency and net power output, regarding the isentropic efficiencies of pump (ηp) and expander (ηe) and the heat source temperature (Th,in) has been carried out using MATLAB and NIST

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34

Nikolaev, Vitaly S., Sergey A. Abalakin, and Igor V. Tishchenko. "Comparison of efficiency losses due to leaks for turbine units of aviation air conditioning systems with petal-type gas-dynamic bearings and ball bearings." Refrigeration Technology 111, no. 1 (2022): 13–20. http://dx.doi.org/10.17816/rf96964.

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BACKGROUND: Designers of turbomachines strive to increase the efficiency of expanding compressed gases by reducing all kinds of energy losses, particularly due to clearances between the impeller and the body elements of the turbomachine. AIM: This article aimed to evaluate a possible increase in efficiency with a decrease in the radial and axial clearance between the blades of a radial-axial impeller and the casing of a centrifugal expander in the designs of turbomachines with ball bearings and petal-type gas-dynamic bearings. MATERIALS AND METHODS: The radial and axial clearances

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35

Dmitriev, V. T., D. R. Gabidullin, G. A. Boyarskikh, and A. O. Kochanov. "Choosing a construction of junction point of mining turbomachines and a collector." News of the Ural State Mining University, no. 1(45) (2017): 62–64. http://dx.doi.org/10.21440/2307-2091-2017-1-62-64.

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36

Yang, Jingze, Zitao Yu, and Hong Yao. "Efficient turbomachinery layout design and performance comparison of supercritical CO2 cycles for high-temperature concentrated solar power plants under peak-shaving scenarios." Energy 285 (December 2023): 129445. http://dx.doi.org/10.1016/j.energy.2023.129445.

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37

Gundy-Burlet, K. L., M. M. Rai, R. C. Stauter, and R. P. Dring. "Temporally and Spatially Resolved Flow in a Two-Stage Axial Compressor: Part 2—Computational Assessment." Journal of Turbomachinery 113, no. 2 (1991): 227–32. http://dx.doi.org/10.1115/1.2929090.

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Fluid dynamics of turbomachines are complicated because of aerodynamic interactions between rotors and stators. It is necessary to understand the aerodynamics associated with these interactions in order to design turbomachines that are both light and compact as well as reliable and efficient. The current study uses an unsteady, thin-layer Navier–Stokes zonal approach to investigate the unsteady aerodynamics of a multistage compressor. Relative motion between rotors and stators is made possible by the use of systems of patched and overlaid grids. Results have been computed for a 2 1/2-stage com

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38

Papoutsis-Kiachagias, E. M., S. A. Kyriacou, and K. C. Giannakoglou. "The continuous adjoint method for the design of hydraulic turbomachines." Computer Methods in Applied Mechanics and Engineering 278 (August 2014): 621–39. http://dx.doi.org/10.1016/j.cma.2014.05.018.

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39

MAKAROV, Nikolay, Vladimir MAKAROV, Aleksandr UGOLNIKOV, and Mikhail NOSYREV. "OPTIMIZATION OF PARAMETERS OF FAN UNITS OF AIR COOLING DEVICES." Sustainable Development of Mountain Territories 13, no. 3 (2021): 433–40. http://dx.doi.org/10.21177/1998-4502-2021-13-3-433-440.

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Purpose of the study. Optimization of the parameters of high speed fan units of air coolers, the combination of which achieves the highest economic efficiency of fan units and, accordingly, the most rational range of specific speed values for the modes of maximum efficiency of fan units in combination with the relative diameter of the sleeve. Development of a mathematical model for determining the local values of the parameters of the efficiency of highspeed fan installations. Sustainable development of territories with active subsoil use is closely related to solving the problems of improving

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40

Tiainen, Jonna, Ahti Jaatinen-Värri, Aki Grönman, Petri Sallinen, Juha Honkatukia, and Toni Hartikainen. "Validation of the Axial Thrust Estimation Method for Radial Turbomachines." International Journal of Rotating Machinery 2021 (February 24, 2021): 1–18. http://dx.doi.org/10.1155/2021/6669193.

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Анотація:

The fast preliminary design and safe operation of turbomachines require a simple and accurate prediction of axial thrust. An underestimation of these forces may result in undersized bearings that can easily overload and suffer damage. While large safety margins are used in bearing design to avoid overloading, this leads to costly oversizing. In this study, the accuracy of currently available axial thrust estimation methods is analyzed by comparing them to each other and to theoretical pressure distribution, numerical simulations, and new experimental data. Available methods tend to underestima

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41

Mostefa, Brihmat, Refassi Kaddour, Douroum Embarek, and Kouadri Amar. "Analysis and Optimization of the Performances of the Centrifugal Compressor Using the CFD." International Journal of Heat and Technology 39, no. 1 (2021): 107–20. http://dx.doi.org/10.18280/ijht.390111.

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Centrifugal compressors have been used in many areas of the machinery. The centrifugal compressor design is very complex, and a unique design system needs to be developed. A centrifugal compressor design system should be easy to use in interface and also flexible for inputs and outputs. The design tool also needs to be able to predicate the compressor performance in a fairly accurate level. In this study, we have developed a general analyses and optimization approach in the design and performance analysis of centrifugal turbomachines. This approach is based on different methods starting from a

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42

Rosa Taddei, S., and F. Larocca. "Axisymmetric design of axial turbomachines: An inverse method introducing profile losses." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 222, no. 6 (2008): 613–21. http://dx.doi.org/10.1243/09576509jpe644.

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43

Mehrotra, Pranav, Paras Seth, Ishaan Nagpal, Devansh Rastogi, and Vivek Kumar. "CFD analysis of hydrodynamic journal bearing operating with non-newtonian lubricant." Journal of Interdisciplinary Mathematics 27, no. 7 (2024): 1637–61. https://doi.org/10.47974/jim-2005.

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The hydrodynamic journal bearing is a crucial machine element used to support radial load in turbomachines. The research in journal bearings focuses on enhancing the steady state and dynamic performance indices. This study deals with the CFD simulations of hydrodynamic journal bearing operating with non-Newtonian lubricants. The CFD simulations have been performed using the Fluent module of Ansys 2023. The Power law fluid model has been used to describe the non-Newtonian character of the lubricant. The plots are generated for maximum fluid pressure, film pressure distribution, and turbulence d

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44

Volkov-Muzylev, V. V. "Influence of the foil gas-dynamic bearing installation angle on its performance." Proceedings of Higher Educational Institutions. Маchine Building, no. 10 (763) (October 2023): 64–70. http://dx.doi.org/10.18698/0536-1044-2023-10-64-70.

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Gas-dynamic bearings are widely used in the high-speed low-power turbomachines due to their missing complex oil system, wide range of the operating temperatures, low cost, long overhaul intervals, etc. Due to these reasons, such bearings are introduced in the most advanced turbomachines systems, for example, in the aerospace and energy industries. Currently, design, development and research continues on the new promising gas-dynamic bearings of this type. One of the aspects in such research lies in studying the bearing units performance exposed to the off-design conditions. The paper considers

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45

Shutin, Denis, Alexander Fetisov, Maksim Litovchenko, Aleksey Rodichev, Yuri Kazakov, and Leonid Savin. "Methodology for Optimal Design of Active Fluid Film Bearings Considering Their Power Losses, Stability and Controllability: Theory and Experiment." Energies 17, no. 23 (2024): 5879. http://dx.doi.org/10.3390/en17235879.

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This study addresses the problem of the automated synthesis of active fluid film bearings optimized for their adjustable design for new generations of turbomachines. The developed methodology proposes a criterion describing the ability of a bearing’s mechanical design to effectively implement control actions along with its energy efficiency and stability properties considered in a solved multi-objective optimization problem. The design process of actively lubricated journal bearings was investigated in the context of the proposed approach. A multi-objective optimization problem was solved with

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46

Humm, H. J., C. R. Gossweiler, and G. Gyarmathy. "On Fast-Response Probes: Part 2—Aerodynamic Probe Design Studies." Journal of Turbomachinery 117, no. 4 (1995): 618–24. http://dx.doi.org/10.1115/1.2836580.

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The influence of the probe size and geometry on the quality of fast-response measurements in turbomachines has been experimentally investigated. For investigations in the static domain (time-independent flows) probes were calibrated in two continuously operating wind tunnels in the range 0.2 < M < 1.2. For dynamic calibrations in time-variant flows model experiments in water (0.025 < k < 0.4, reduced frequency) were performed. Aerodynamic characteristics were determined for a great number of probe geometries, such as circular cylinders and wedge-type probes with varied apex angles,

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47

Repetckii, Oleg, and Van Vinh Nguyen. "DYNAMIC CHARACTERISTICS ANALYSIS OF BLADED DISK TURBOMACHINES BASED ON INTENTIONAL MISTUNING." Perm National Research Polytechnic University Aerospace Engineering Bulletin, no. 62 (2020): 61–70. http://dx.doi.org/10.15593/2224-9982/2020.62.07.

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To increase technical level of energy turbomachine in modern turbomachinery, high reliability and durability of structures are required in the design, manufacture and operation of turbomachine. Any change geometry, mass, material properties of the bladed disk of turbomachine in the design is called mistuning parameters. With a small value of mistuning blades can significantly increase amplitude, displacement or stresses of the blades structures. So, analysis influence of the effect mistuning parameters on the dynamic characteristics in the field of turbomachine is an important and urgent task.

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48

Xiao, Yuhui, Yuan Zhou, Yuan Yuan, Yanping Huang, and Gengyuan Tian. "Research Advances in the Application of the Supercritical CO2 Brayton Cycle to Reactor Systems: A Review." Energies 16, no. 21 (2023): 7367. http://dx.doi.org/10.3390/en16217367.

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Amid the global emphasis on efficient power conversion systems under the “dual carbon” policy framework, the supercritical CO2 (SCO2) Brayton cycle is a noteworthy subject, owing to its pronounced efficiency, compact design, economic viability, and remarkable potential to increase the thermal cycle efficiency of nuclear reactors. However, its application across various nuclear reactor loops presents divergent challenges, complicating system design and analytical processes. This paper offers a thorough insight into the latest research on the SCO2 Brayton cycle, particularly emphasising its inte

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49

Nava, P., N. Paone, G. L. Rossi, and E. P. Tomasini. "Design and Experimental Characterization of a Nonintrusive Measurement System of Rotating Blade Vibration." Journal of Engineering for Gas Turbines and Power 116, no. 3 (1994): 657–62. http://dx.doi.org/10.1115/1.2906870.

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A measurement system for nonintrusive monitoring of rotating blade vibration in turbomachines based on fiber optic sensors is presented. The design of the whole system is discussed; the development of special purpose sensors, their interfacing to the data acquisition system, and the signal processing are outlined. The processing algorithms are tested by software simulation for several possible blade vibrations. Experimental tests performed on different bladed rotors are presented. Results are compared to simultaneous strain gage measurements.

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50

Yoo, I. S., M. R. Park, and M. K. Chung. "Improved momentum exchange theory for incompressible regenerative turbomachines." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 219, no. 7 (2005): 567–81. http://dx.doi.org/10.1243/095765005x31252.

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On the basis of the momentum exchange theory, an improved mathematical model is developed to analyse the complicated helical flow in regenerative turbomachines and to suggest a systematic way to design such kind of machines. The helical flow in the machines is resolved into a peripheral component and a circulatory component, and a theoretically sound method is proposed to calculate the circulatory flow velocity and slip factor, which are closely related to the machine performance. To implement the present method, the concepts of a circulatory pivot and an effectiveness of the circulatory flow

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