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    Wyświetlanie 1-9 z 9
    Tytuł:
    Numerical estimation of losses in steam flow through LP turbine blade rows
    Autorzy:
    Dyskas, S.
    Wróblewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955213.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska
    Tematy:
    LP steam turbine
    wet steam
    condensation
    losses
    Opis:
    The aim of this work is to estimate the losses in steam flow through an LP steam turbine rotor and the who]e stage. Two types of losses occur in steam flow, aerodynamic (profile, secondary flow, leakage) and thermodynamic (due to addition of heat caused by condensation). The presented numerical results are split into two groups. First, a comparison of three different calculation methods of steam flow is carried out. To this end, the geometry of an LP steam turbine's last rotor is chosen. The first examined method is the Streamline Curvature Method (SCM) used on the meridional plane with loss correlations, the other two being commercial and in-house CFD codes, solving the Reynolds-averaged Navier-Stokes equations for a 3D flow. The first two codes model equilibrium steam properties below the saturation line, while the latter models non-equilibrium steam properties. Finally, a comparison is made of the influence on lass prediction of various condensation models for the geometry of the penultimate stage, with the use of an in-house CFD code.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 2; 177-190
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluating the efficiency of low pressure part of steam turbines based on probing measurements
    Autorzy:
    Gardzilewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/175464.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wet steam
    steam turbines
    measurements
    numerical calculations
    Opis:
    A methodology oflow pressure part turbine efficiency evaluation based on measurements of the steam flow parameters in the interspaces between neighbouring stages is described. Specially manufactured probes have been applied carry out such measurements. The efficiencies of the stages operating in the superheated steam zone result directly from experimental values of pressures, temperatures, and flow angles. To complete the efficiency evaluation for the stages operating in the wet steam region, a relevant estimation of blading system losses has been proposed and validated. This evaluation of losses is compatible with the measurement results. Adaptation of a comparative error analysis makes it possible to show the advantages of the methodology over the thermal balance applied during performance tests. The low pressure turbine efficiency evaluation methodology has been applied to numerous steam turbine power units of 200–500 MW output.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2017, 135; 41-56
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical calculation of the steam condensing flow
    Autorzy:
    Dykas, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1967648.pdf
    Data publikacji:
    2001
    Wydawca:
    Politechnika Gdańska
    Tematy:
    condensation
    homogeneous
    real gas
    wet steam
    Opis:
    Considering the flow in the last stages of LP (low pressure) steam turbine the strong non-linearity of the thermal parameters of state and possibility of the two-phase flow have to be taken into account in the numerical calculation of the flow field. In this paper numerical calculations of the steam condensing flow for the turbine geometry are presented. The steam properties are described here on the basis of the IAPWS’97 formulation. The classical nucleation theory of Volmer and Frenkel was adapted for modelling of condensing flow. The droplet growth model of Gyarmathy is implemented. The calculations are based on the time dependent 3D Euler equations, which are coupled to three additional mass conservation equations for the liquid phase and are solved in conservative form.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 4; 519-535
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wet steam flow in 1100 MW turbine
    Autorzy:
    Jun, Gukchol
    Kolovratník, Michal
    Hoznedl, Michal
    Powiązania:
    https://bibliotekanauki.pl/articles/1954998.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steam turbine
    wet steam
    loss
    non-equilibrium condensation
    CFD
    Opis:
    The paper deals with the wet steam flow in a steam turbine operating in a nuclear power plant. Using a pneumatic and an optical probe, the static pressure, steam velocity, steam wetness and the fine water droplets diameter spectra were measured before and beyond the last turbine low-pressure stage. The results of the experiment serve to understand better the wet steam flow and map its liquid phase in this area. The wet steam data is also used to modify the condensation model used in computational fluid dynamics simulations. The condensation model, i.e. the nucleation rate and the growth rate of the droplets, is adjusted so that results of the numerical simulations are in a good agreement with the experimental results. A 3D computational fluid dynamics simulations was performed for the lowpressure part of the turbine considering non-equilibrium steam condensation. In the post-processing of the of the numerical calculation result, the thermodynamic wetness loss was evaluated and analysed. Loss analysis was performed for the turbine outputs of 600, 800, and 1100 MW, respectively.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 3; 63-85
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation of spontaneously condensing flows in a plane turbine cascade
    Autorzy:
    Li, L.
    Li, G.
    Feng, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1986685.pdf
    Data publikacji:
    2002
    Wydawca:
    Politechnika Gdańska
    Tematy:
    wet steam
    condensing flow
    Eulerian/Eulerian model
    numerical simulation
    Opis:
    The low efficiency of wet steam turbine is mainly attributed to wetness losses. To investigate the mechanisms which give rise to these losses, a fully Eulerian model has been developed for calculation of the wet steam flows with spontaneous condensation. In this model, the liquid phase is described with two conservation equations in Eulerian form and coupled with a solver of gas dynamics equations. With such a model, the existing code for simulation of single-phase flows can easily be changed to include wet steam two-phase flows in wet steam turbines. A numerical simulation of condensing flow in a plane turbine cascade is performed, and the numerical results are presented and compared with the experimental results.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 1; 209-216
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light extinction and ultrasound method in the identification of liquid mass fraction content in wet steam
    Autorzy:
    Majkut, Mirosław
    Dykas, Sławomir
    Smołka, Krystian
    Powiązania:
    https://bibliotekanauki.pl/articles/1845458.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wet steam
    light extinction
    ultrasound method
    mass fraction content
    Opis:
    Recently, significant progress has been made in experimental studies on the flow of wet steam, measuring techniques based on recording the phenomenon of extinction of light and ultrasound have been elaborated or improved. The basic value experimentally determined in the final stage was the content of the liquid phase defined as the wetness fraction. The methodology of tests and experimental investigations was presented, as well as the applied and developed measurement systems. Next, some developed designs of new ultrasonic and light extinction measuring probe and their modifications are described. The article presents also some examples of applications of the developed measurement techniques in application to experimental research conducted on wet steam. Examples of comparison between experimental and numerical tests for the extinction method are also provided.
    Źródło:
    Archives of Thermodynamics; 2020, 41, 4; 63-92
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light extinction and ultrasound method in the identification of liquid mass fraction content in wet steam
    Autorzy:
    Majkut, Mirosław
    Dykas, Sławomir
    Smołka, Krystian
    Powiązania:
    https://bibliotekanauki.pl/articles/1845452.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wet steam
    light extinction
    ultrasound method
    mass fraction content
    Opis:
    Recently, significant progress has been made in experimental studies on the flow of wet steam, measuring techniques based on recording the phenomenon of extinction of light and ultrasound have been elaborated or improved. The basic value experimentally determined in the final stage was the content of the liquid phase defined as the wetness fraction. The methodology of tests and experimental investigations was presented, as well as the applied and developed measurement systems. Next, some developed designs of new ultrasonic and light extinction measuring probe and their modifications are described. The article presents also some examples of applications of the developed measurement techniques in application to experimental research conducted on wet steam. Examples of comparison between experimental and numerical tests for the extinction method are also provided.
    Źródło:
    Archives of Thermodynamics; 2020, 41, 4; 63-92
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pary
    Steams
    Autorzy:
    Litke, Benedykt Julian
    Powiązania:
    https://bibliotekanauki.pl/articles/136138.pdf
    Data publikacji:
    2018
    Wydawca:
    Wyższa Szkoła Techniczno-Ekonomiczna w Szczecinie
    Tematy:
    pary
    proces wytwarzania
    para przegrzana
    para mokra
    para wilgotna
    parametry pary przegrzanej
    parametry pary mokrej
    wykres graniczny pary
    steam
    production process
    superheated steam
    wet steam
    parameters of superheated
    parameters wet steam
    steam limit graph
    Opis:
    Wstęp i cele: W pracy opisano proces wytwarzania pary, parametry pary mokrej, parę przegrzaną, oraz wykresy graniczne pary. Celem pracy jest opis graficznego przebiegu temperatury substancji przy izobarycznym podgrzewaniu, podanie charakterystyk pary mokrej i pary przegrzanej oraz opis graficzny pary wodnej. Materiał i metody: Materiał stanowią źródła z literatury z zakresu termodynamiki. W pracy zastosowano metodę analizy teoretycznej. Wyniki: Rezultatem analizy jest opracowanie analityczne procesu wytwarzania pary, parametrów pary mokrej (wilgotnej) oraz przedstawienie graficzne wykresów granicznych pary. Wnioski: W czasie podgrzewania cieczy przy wyższym ciśnieniu, temperatura nasycenia jest wyższa. Czas parowania cieczy zmniejsza się ze wzrostem ciśnienia. Przy wyższym ciśnieniu do odparowania cieczy wymagana jest mniejsza ilość ciepła. Proces izobarycznego parowania jest również procesem izotermicznym. Wartości parametrów termodynamicznych pary mokrej zależą więc od stopnia suchości.
    Introduction and aim: The work describes the steam generation process, wet steam parameters, superheated steam, and steam limit graphs. The aim of the work is to describe the graphic temperature course of the substance during isobaric heating, to provide the characteristics of wet steam and superheated steam and a graphic description of the water vapor. Material and methods: Material covers some sources based on the literature in the field of thermodynamics. The method of theoretical analysis has been shown in the paper. Results: The result of the analysis is the analytical development of the steam generation process, the parameters of the wet (damp) steam and the graphic representation of the steam boundary graphs. Conclusion: When the fluid is heated at a higher pressure, the saturation temperature is higher. The evaporation time of the fluid decreases with increasing pressure. At higher pressure, less heat is needed to evaporate the fluid. The process of isobaric evaporation is also an isothermal process. The values of thermodynamic parameters of wet steam depend on the degree of dryness.
    Źródło:
    Problemy Nauk Stosowanych; 2018, 9; 43-50
    2300-6110
    Pojawia się w:
    Problemy Nauk Stosowanych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Models for water steam condensing flows
    Autorzy:
    Wróblewski, W.
    Dykas, S.
    Chmielniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/240446.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dysza Lavala
    kondensacyjne modele przepływu
    para wylotowa
    condensing flow models
    Laval nozzle
    wet steam
    Opis:
    Abstract The paper presents a description of selected models dedicated to steam condensing flow modelling. The models are implemented into an in-house computational fluid dynamics code that has been successfully applied to wet steam flow calculation for many years now. All models use the same condensation model that has been validated against the majority of available experimental data. The state equations for vapour and liquid water, the physical model as well as the numerical techniques of solution to flow governing equations have been presented. For the single-fluid model, the Reynolds-averaged Navier-Stokes equations for vapour/liquid mixture are solved, whereas the two-fluid model solves separate flow governing equations for the compressible, viscous and turbulent vapour phase and for the compressible and inviscid liquid phase. All described models have been compared with relation to the flow through the Laval nozzle.
    Źródło:
    Archives of Thermodynamics; 2012, 33, 1; 67-86
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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