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Wyszukujesz frazę "flow analysis" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    A thermodynamic analysis of a gas-steam turbine incorporating a full model of a spray – ejector condense
    Autorzy:
    Ziółkowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/175324.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    computational flow mechanics modelling
    two-phase ejector
    thermodynamic analysis
    numerical analysis
    Opis:
    The specific issues that occur in the mathematical modelling of a spray-ejector condenser have been presented. The results of a thermodynamic analysis of a steam-gas turbine cycle have been obtained by computational flow mechanics code. The main aim of the spray-ejector condenser is simultaneously condensing steam and compressing CO2 from the condensation pressure to about 100 kPa. Hence, the most important innovation of this steam-gas cycle emerges as the enhanced condensation, which is based on the nano-injection of cold water and a jet-powered compression of CO2 performed in the spray-ejector condenser.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2018, 139; 63-96
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of stereology for assessment of two-phase flow structures
    Autorzy:
    Masiukiewicz, M.
    Ulbrich, R.
    Zając, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/175510.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stereological analysis
    two-phase flow pattern
    pattern recognition
    Opis:
    This paper describes a method for two-phase flow structures evaluation of gas-liquid mixture based on theoretical assumptions for the stereology in materials science. This assessment is based on the analysis of digital images, obtained with a high-speed camera. The bright field technique was used for process visualization. The images obtained during the visualisation were, in fact, projections of the structures. For the given recording conditions, the stereological analysis applied was based on the linear method and on the method of random and directed secants. The new methods of determining important parameters of two-phase flow were proposed on the basis of collected data. The parameters are as follows: the volume fraction, the interfacial area, the number of objects in one of the phases of the mixture and two other structural parameters of the selected two-phase fluid obtained from the analysis of the two-dimensional image (average length of chords for projected objects, average free distance for convex shapes from the projection).
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2013, 125; 39-54
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The thermodynamic analysis of the Szewalski hierarchic vapour cycle cooperating with a system of waste heat recovery
    Autorzy:
    Ziółkowski, P.
    Kowalczyk, T.
    Hernet, J.
    Kornet, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/175466.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    binary cycle
    waste heat
    ORC
    thermodynamical analysis
    numerical
    analysis
    CFM (computational flow mechanics)
    Opis:
    In this paper, thermodynamic analysis of the Szewalski hierarchic vapour cycle cooperating with a system of waste heat recovery from exhaust gases are presented. According to that purpose, the CFM (computation flow mechanics) approach has been used correctly. In this paper, traditional steam cycle, the bottoming organic Rankine cycle (ORC) and a system of waste heat recovery with use of water with temperature 90 ◦C have been analyzed. The Szewalski binary vapour cycle is providing steam as the working fluid in the high temperature part of the cycle, while another fluid – organic working fluid – as the working substance substituting conventional steam over the temperature range represented by the low pressure steam expansion. The steam cycle for reference conditions, the Szewalski binary vapour cycle, and the Szewalski hierarchic vapour cycle cooperating with a system of waste heat recovery have been comprised. Four working fluids in the low temperature part of binary cycle such as ammonia, propane, isobutene and ethanol have also been investigated. Moreover, the Szewalski cycle is a good resolution for proper using heat flux received from the exhaust gases heat regeneration system.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2015, 129; 51-75
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accuracy problem of modeling in a gas turbine cycle with heat regeneration according to Szewalski’s idea
    Autorzy:
    Ziółkowski, P.
    Piotrowski, R.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175258.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat regeneration
    gas turbine
    thermodynamical analysis
    numerical analysis
    basic model vs numerical model
    computational flow mechanics (CMF)
    Opis:
    In this paper, authors undertook a problem of accuracy and exactness verification of some assumptions and calculation methods that are important in the 0D modeling. The computational flow mechanics (CFM) tools and basic calculations of gas turbine cycle with heat regeneration according to Szewalski’s idea have been done. Results and conclusions for this specific problem have been presented. Gas turbine cycle with heat regeneration according to Szewalski’s idea includes regeneration as same as it is now commonly employed in steam turbine cycles. Mentioned regeneration is enabled by adding to the simple cycle devices configuration of two regenerative heat exchangers and auxiliary compressor. That modification allows to obtain working medium circulation in closed cycle inside a basic cycle. Efficiency gain is dependent on extraction pressure and extraction mass flow rate.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2015, 129; 77-109
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancement of the Brayton cycle efficiency by water or steam utilization
    Autorzy:
    Jesionek, K.
    Chrzczonowski, A.
    Ziółkowski, P.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175275.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Brayton cycle
    regeneration
    Cheng cycle
    thermodynamic analysis
    gas steam turbine
    computational flow mechanics
    steam injection
    water injection
    interstage cooling
    Opis:
    In the paper, thermodynamic analysis of two modifications of the Brayton cycle into enhancement cycles with water or steam injection are discussed. The first one deals with a water injected gas turbine modified system with both interstage compressed air cooling and air heating (heat regeneration) before combustion chamber. The second one, mainly devoted to higher steam to air ratio, is connected with separate steam production in the heat recovery steam generator. Hence, steam utilization for the gas turbine propulsion in the Cheng cycle has been analysed. The analysis has been based on the computational flow mechanics (CFM) models of these advanced humidified systems, thanks to which, the influence of the main thermodynamic and design parameters have been examined.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 93-109
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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