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    Wyświetlanie 1-12 z 12
    Tytuł:
    Two-tier low pressure cylinders for condensing steam turbines
    Autorzy:
    Zaryankin, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/175404.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    two-tier stage
    two-tier low pressure cylinder
    fork-shaped blade
    Opis:
    The paper deals with new construction of low pressure cylinder (LPC) for condensing steam turbines. The flow path of these cylinders is formed on the base of new two-tier stages. As opposed to well known Baumann’s stages newer two-tier stages is a combination of two independent stages with own blades set. Such construction allows to decrease the number of LPC in the existing turbines or to ensure their operation with very high vacuum in the condenser or increases in 1.5 times power capacity of new turbines without increasing of the last stage blade length and LPC number.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 123-130
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technical solution for improve the efficiency of the steam turbines
    Autorzy:
    Bilyk, Y.
    Martsinkovsky, V. S.
    Nosowa, O.
    Tarelnik, V.
    Yurko, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/175480.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    two-tier stage
    two-tier low pressure cylinder
    fork-shaped blade
    Opis:
    This paper presents effective ways to increase the carrying and reliability of thrust bearings. Technical solutions implemented by TRIZ Ltd have been considered. In comparative characteristics of the bearing took into account such factors as: capacity, peripheral speed at the average radius, speed at the periphery, specific pressure, specific lubricant consumption. Comprehensive analysis of the working conditions of bearing was aimed to protect against electroerosion.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2015, 130; 31-55
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    General description of cold sprayed coatings formation and of their properties
    Autorzy:
    Winnicki, M.
    Piwowarczyk, T.
    Malachowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/201414.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bonding mechanism
    microstructure
    FEM
    high pressure cold spray
    low pressure cold
    mechanizm sklejenia
    mikrostruktura
    MES
    Opis:
    This paper intends to describe the formation of cold sprayed coatings and their properties based on latest works. Thermodynamic aspects of the cold spray process are discussed, including the main factors influencing powder particles velocity, e.g. nozzle construction, gas type, powder morphology as well as its significance for coating quality. The phenomenon of coating building is illustrated using both numerical simulation and microstructure analysis. Particular emphasis is placed on the description of critical and erosion velocities. Microstructure and coating properties have also been discussed, i.e. porosity, electrical conductivity and residual stresses based on own research. These are further supplemented by a literature review. Finally, clear division between the low and high pressure cold spray method is made.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 3; 301-310
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of innovative solutions to improve the efficiency of the LPC flow part of the 220 MW NPP steam turbine
    Autorzy:
    Rusanov, Andrii
    Subotin, Viktor
    Shvetsov, Viktor
    Rusanov, Roman
    Palkov, Serhii
    Palkov, Ihor
    Chugay, Marina
    Powiązania:
    https://bibliotekanauki.pl/articles/2091359.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steam turbine
    low-pressure cylinder
    flow part
    meridional contours
    spatial flow
    computational investigation
    Opis:
    The results of the gas-dynamic calculation of the low-pressure cylinder flow part of the K-220-44 type steam turbine intended for operation at nuclear power plants are presented. The ways of the flow part improvement were determined. Some of those ways include the use of innovative approaches that were not previously used in steam turbines. The design of the new flow part was carried out on the basis of a comprehensive methodology implemented in the IPMFlow software package. The methodology includes gas-dynamic calculations of various levels of complexity, as well as methods for analytical construction of the spatial shape of the blade tracts based on a limited number of parameterized values. The real thermodynamic properties of water and steam were taken into account in 3D calculations of turbulent flows. At the final step, end-to-end 3D calculations of the lowpressure cylinder that consists of 5 stages were performed. The technology of parallel computing was applied in those calculations. It is shown that due to the application of innovative solutions, a significant increase in efficiency can be achieved in the developed low-pressure cylinder.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 1; 63--87
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and hardness of Pyrowear 53 steel after low-pressure vacuum carburizing at 921°C
    Autorzy:
    Wojtyczka, Artur
    Iżowski, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/1831343.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low-pressure carburizing
    diffusion
    Pyrowear 53 steel
    nawęglanie niskociśnieniowe
    dyfuzja
    stal Pyrowear 53
    Opis:
    The present paper studies and analyzes the low-pressure vacuum carburizing of Pyrowear 53 steel. The carburizing was performed at 921°C. The results after the completion of the treatment process are presented, i.e. microstructure of the surface layer and hardness. The results confirm that carburizing can be effectively used in hardening of the steel.
    Źródło:
    Advances in Manufacturing Science and Technology; 2020, 44, 4; 109-112
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of the Quenching Method on the Deformations Size of Gear Wheels after Vacuum Carburizing
    Autorzy:
    Dybowski, K.
    Sawicki, J.
    Kula, P.
    Atraszkiewicz, R.
    Lipa, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/352890.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermo-chemical treatment
    vacuum carburizing
    carburized layer
    quenching
    quenching deformations
    low-pressure carburizing
    Opis:
    This paper presents a comparison of the deformations and residual stresses in gear wheels after vacuum carburizing process with quenching in high-pressure nitrogen and oil. The comparison was made on a medium-sized gear wheels, made of AMS6265 (AISI 9310) steel. This steel is applied in the aerospace industry for gears. The study has provided grounds for an assessment of the effect of the method of quenching on the size of deformations. Compared to oil quenching, high-pressure gas quenching following vacuum carburizing resulted in more uniform and smaller deformations.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 1057-1062
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and computational fluid dynamics analysis of the last stage of innovative gas-steam turbine
    Autorzy:
    Głuch, Stanisław Jerzy
    Ziółkowski, Paweł
    Witanowski, Łukasz
    Badur, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1955024.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    axial turbine
    blade design
    computational fluid dynamics
    last stage of low-pressure
    twisted blade
    Opis:
    Research regarding blade design and analysis of flow has been attracting interest for over a century. Meanwhile new concepts and design approaches were created and improved. Advancements in information technologies allowed to introduce computational fluid dynamics and computational flow mechanics. Currently a combination of mentioned methods is used for the design of turbine blades. These methods enabled us to improve flow efficiency and strength of turbine blades. This paper relates to a new type turbine which is in the phase of theoretical analysis, because the working fluid is a mixture of steam and gas generated in a wet combustion chamber. The main aim of this paper is to design and analyze the flow characteristics of the last stage of gas-steam turbine. When creating the spatial model, the atlas of profiles of reaction turbine steps was used. Results of computational fluid dynamics simulations of twisting of the last stage are presented. Blades geometry and the computational mesh are also presented. Velocity vectors, for selected dividing sections that the velocity along the pitch diameter varies greatly. The blade has the shape of its cross-section similar to action type blades near the root and to reaction type blades near the tip. Velocity fields and pressure fields show the flow characteristics of the last stage of gas-steam turbine. The net efficiency of the cycle is equal to 52.61%.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 3; 255-278
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Casting Defects Filling by Low Pressure Cold Spraying Method
    Autorzy:
    Piwowarczyk, T.
    Winnicki, M.
    Małachowska, A.
    Ambroziak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382335.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting defects
    surface treatment
    Low Pressure Cold Spraying
    LPCS
    bond strength
    wady odlewów
    obróbka powierzchniowa
    natryskiwanie na zimno
    przyczepność
    Opis:
    In this paper the possibilities of using Low Pressure Cold Spraying (LPCS) method for filling the casting defects are presented. In Cold Spraying there is no metallurgical bonding because powder particles are deposited in solid state. The effect of high temperature on both substrate and coating structure is avoided. In performed experiments coatings of Al, Zn and Sn powders with addition of Al2O3 ceramic were deposited onto chosen aluminium alloys substrates. Two the most important mechanical properties of Cold Sprayed coatings, i.e. bond strength and microhardness, were analysed. Coatings bond strength was determined by tensile pull test. Coatings microstructure was examined with the use of scanning electron microscope (SEM) analysis. LPCS method potential applications in castings repair is shown.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 109-114
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Al5FeSi Phases on the Cracking of Castings at Al-Si Alloys
    Autorzy:
    Hren, I.
    Svobodova, J.
    Michna, Š.
    Powiązania:
    https://bibliotekanauki.pl/articles/380066.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminium alloy
    intermetallic phase
    low pressure casting
    alloy structure
    iron contamination
    stop aluminium
    faza międzymetaliczna
    odlewanie niskociśnieniowe
    struktura stopu
    zanieczyszczenie żelazem
    Opis:
    The research described in this contribution is focused on fractographic analysis of the fracture area of newly developed eutectic silumin type AlSi9NiCuMg0.5 (AA 4032), which was developed and patented by a team of staff of the Faculty of Mechanical Engineering. The paper presents determination of the cause of casting cracks in operating conditions. Fractographic analysis of the fracture area, identification of the structure of the casting, identification of structural components on the surface of the fracture surface and chemical analysis of the material in the area of refraction were performed within the experiment. Al-Si alloys with high specific strength, low density, and good castability are widely used in pressure-molded components for the automotive and aerospace industries. The results shown that the inter-media phases Fe-Al and Fe-Si in aluminium alloys lead to breakage across the entire casting section and a crack that crossed the entire cross section, which was confirmed by EDS analysis.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 4; 120-124
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aluminum Alloy Development for Wheel Production by Low Pressure Die Casting with New Generation Computational Materials Engineering Approaches
    Autorzy:
    Yağcı, T.
    Cöcen, Ü.
    Çulha, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079795.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloy
    foundry industry
    wheels
    low pressure casting
    materials engineering
    mechanical properties
    microstructural design
    stop aluminium
    przemysł odlewniczy
    koła
    odlewanie niskociśnieniowe
    inżynieria materiałowa
    właściwości mechaniczne
    projektowanie mikrostrukturalne
    Opis:
    Computational Materials Engineering (CME) is a high technological approach used to design and develop new materials including the physical, thermal and mechanical properties by combining materials models at multiple techniques. With the recent advances in technology, the importance of microstructural design in CME environments and the contribution that such an approach can make in the estimation of material properties in simulations are frequently discussed in scientific, academic, and industrial platforms. Determination of the raw material characteristics that can be modeled in a virtual environment at an atomic scale by means of simulation programs plays a big role in combining experimental and virtual worlds and creating digital twins of the production chain and the products. In this study, a new generation, alternative and effective approach that could be used to the development of Al-Si based wheel casting alloys is proposed. This approach is based on the procedure of optimizing the physical and thermodynamic alloy properties developed in a computer environment with the CME technique before the casting phase. This article demonstrates the applicability of this approach in alloy development studies to produce Al-Si alloy wheels using the low pressure die casting (LPDC) method. With this study, an alternative and economical way is presented to the alloy development studies by trial and error in the aluminum casting industry. In other respects, since the study is directly related to the automotive industry, the reduction in fuel consumption in vehicles is an expected effect, as the new alloy aims to reduce the weight of the wheels. In addition to conserving energy, reducing carbon emissions also highlights the environmental aspects of this study.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 4; 35-46
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of plasma gases composition and powder feed rate on microstructure of ceramic coatings obtained by plasma spray physical vapour deposition (PS-PVD)
    Wpływ składu chemicznego gazów plazmotwórczych oraz natężenia przepływu proszku na mikrostrukturę warstwy ceramicznej powłokowej bariery cieplnej wytworzonej w procesie fizycznego osadzania z fazy gazowej z odparowaniem w strumieniu plazmy
    Autorzy:
    Góral, M.
    Kubaszek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/175908.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low pressure plasma spray
    LPPS
    PS-PVD
    plasma spray physical vapour deposition
    natryskiwanie plazmowe w warunkach obniżonego ciśnienia
    fizyczne osadzanie z fazy gazowej z odparowaniem w strumieniu plazmy
    Opis:
    The article presents results of research on the influence of the chemical composition of the plasma plume and the powder feed rate on microstructure and thickness of the ceramic coating deposited on IN617 alloy substrate by Plasma Spray Physical Vapour Deposition (PS-PVD) method. There were used three powder feed rates: 2, 10 and 30 g/min and five different compositions of plasma gas (Ar, He, H2 and O2). Current – 2200 A, a sample rotation speed – 20 RPM and pressure inside of chamber – 150 Pa was fixed. The results showed that it is possible to deposit ceramic layer with lamellar and columnar structure, depends on process parameters. Columnar structure, characteristic for the PS-PVD process, is possible to obtain when the energy of plasma plume is sufficient for evaporating ceramic powder and deposit in on the substrate. The columnar-like structure coatings were obtained in the process with the highest amount of He – 60 dm3/min and lower values of powder feed rate – 2 and 10 g/min. Such effect was observed independently from the additional flow of H2 and O2. The columnar-like structure was possible to deposit also with 30 g/min feed rate. However, evaporation of ceramic powder occurred only in the process with only Ar and He in mixture – respectively 35 and 60 dm3/min and with addition only 2 dm3/min O2 to it. Nevertheless, inside the structure a lot of unmelted particles was visible.
    W pracy ustalono wpływ składu chemicznego mieszaniny gazów plazmotwórczych i natężenia przepływu proszku na budowę warstwy ceramicznej na podłożu nadstopu niklu IN-617. Warstwy wytworzono w procesie fizycznego osadzania z fazy gazowej z odparowaniem za pomocą palnika plazmowego (Plasma Spray Physical Vapour Deposition – PS-PVD). Przyjęto natężenie przepływu proszku: 2, 10 i 30 g/min oraz różny skład chemiczny mieszaniny gazów plazmotwórczych (Ar, He, H2 i O2). Stosowano natężenie prądu palnika – 2200 A, prędkość obrotową stołu – 20 obr/min oraz ciśnienie w komorze roboczej – 150 Pa. Analiza wyników badań pozwoliła ustalić, że proces fizycznego osadzania z fazy gazowej z odparowaniem w strumieniu plazmy umożliwia wytworzenie warstwy ceramicznej o budowie lamelarnej i kolumnowej. Budowę kolumnową warstwy, charakterystyczną dla procesu PS-PVD, uzyskano dla energii strumienia plazmy zapewniającej odparowanie podawanego proszku. Warstwy takie wytworzono przy dużym natężeniu przepływu He – 60 dm3/min i małej wartości natężenia przepływu proszku – 2 i 10 g/min. Efekt ten obserwowano niezależnie od natężenia przepływu H2 oraz O2. Budowa kolumnowa warstwy możliwa jest również do wytworzenia przy największym natężeniu przepływu proszku – 30 g/min. Odparowanie i osadzenie warstwy ceramicznej stwierdzono tylko dla mieszaniny Ar + He o natężeniu przepływu – odpowiednio 35 i 60 dm3/min oraz dla mieszaniny Ar +He z dodatkowym wprowadzeniem tlenu O2 o natężeniu przepływu – 2 dm3/min. Wytworzone warstwy cechowały się wówczas występowaniem nieodparowanych cząstek proszku.
    Źródło:
    Advances in Manufacturing Science and Technology; 2017, 41, 2; 63-72
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study on the effects of vibrational frequency on the permeability of gas-containing coal rocks
    Autorzy:
    Bairu, Zhu
    Yang, Song
    Beining, Wu
    Yongqi, Li
    Powiązania:
    https://bibliotekanauki.pl/articles/1853881.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wibracje
    przepuszczalność
    ciśnienie gazu
    gas-containing coal rock
    low-frequency vibration
    gas pressure
    permeability
    sensitivity coefficient
    Opis:
    Low-frequency mechanical vibrations can trigger disasters such as coal-gas outbursts. An in-house “vibration-triaxial stress-seepage” experimental apparatus was used to measure the gas flow rate of rock specimens with varying vibrational frequency, gas pressure, and confining pressure. The results of these tests were then used to derive expressions that describe how the permeability of gas-containing coal rocks is related to these aforementioned factors. In addition, sensitivity coefficients were defined to characterise the magnitude of the permeability response to each permeability-affecting factor (i.e., vibrational frequency and gas pressure). The following insights were gained, regarding the effects of vibrational frequency on the permeability of gas-containing coal rocks: (1) If gas pressure and confining pressure are fixed, the permeability of gas-containing coal rocks rapidly increases, before gradually decreasing, with increasing vibrational frequency. Thus, the permeability of the gas-containing coal rock is always larger with vibrations than without. (2) If vibrational pressure and confining pressure are fixed, the relationship between the permeability of gas-containing coal rocks and gas pressure is consistent with the “Klinkenberg effect,” i.e., the permeability initially decreases, and then increases, with increasing gas pressure. (3) The change in permeability induced by each unit change in gas pressure is proportional to the gas pressure sensitivity coefficient. (4) The change in permeability induced by each unit change in vibrational frequency is proportional to the vibrational frequency sensitivity coefficient.
    Źródło:
    Archives of Mining Sciences; 2021, 66, 2; 265-278
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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