Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "steam" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-15 z 15
    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:
    Estimation of the steam condensation flow via CFD methods
    Autorzy:
    Zakrzewski, W.
    Karcz, M.
    Kornet, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/175353.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    condensation model
    steam turbine
    CFD
    Opis:
    The results of numerical simulations to predict the performance of different steam models have been presented. All of the considered models of steam condensation have been validated on the base of benchmark experiment employing expansion in nozzle and next on the low pressure part of the steam turbine stage. For numerical analysis three models have been finally used - the ideal steam model without condensation, equilibrium steam model and a nonequilibrium steam model. It was confirmed that only the inclusion of the nonequilibrium effects in the computations can lead to a proper prediction of the condensation phenomena in the test nozzle. However, the basic characteristics of the low-pressure turbine can be succesfully estimated using a simple ideal steam or the equilibrium condensation model.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 111-124
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigation of creep behaviour of high-temperature steam turbine compone
    Autorzy:
    Banaszkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/175375.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    creep
    lifetime assessment
    steam turbine
    Opis:
    The paper presents a model for creep basing on the so-called characteristic creep strain. It illustrates its application in computations of old steam turbines components. The presented model is a modification of the Norton model which relates the stress exponent to the creep rupture strength and current stress. Creep strain is a function of the above two quantities, i.e., rupture strength and current stress, and acharacteristic creep strain which is material constant for a given time and temperature. Computational examples regard the rotating and pressure components analysed using the finite element method.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 5-15
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical model for digital simulation of steam turbine set dynamics and on-line turbine load distribution
    Autorzy:
    Badyda, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/175201.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mathematical modeling
    steam turbine
    online optimization
    Opis:
    The general structure and purposes of the distributed control systems (DCS) are reminded in connection with the capability to use them for on-line optimization of the load distribution in large, multiunit power stations. The basic assumptions, equations and structure of a model of backpressure extraction turbine are presented. The tasks, realized using this model in collaboration with the DCS’s measuring and archive systems, are defined. The principles of using and correcting the input data for the considered tasks are described. Model calculation results and recorded measuring data are compared. The input data quality and influence of the DCS record mode on the abilities to use the model appropriately are discussed.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 65-82
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    How much a geometrical model of a honeycomb seal can be simplied in the CFD calculation
    Autorzy:
    Stajnke, M.
    Włodarski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/175443.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CFD modeling
    steam turbine
    seal
    honeycomb
    Opis:
    This paper presents the influence of geometry simplification on the results obtained in the computational fluid dynamics simulation. The subject of simulation was part of the honeycomb seal located at the inlet to high pressure part of a steam turbine. There were three diferent geometrical models assumed in the calculations. First one was two-dimensional case and two others were three-dimensional, one with the radius of curvature and one without. Numerical simulations were performed for 15 sets of boundary conditions to compare flow characteristics for each geometrical case.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2017, 136; 55-64
    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
    Tytuł:
    A verification approach to thermoelastic steam turbine rotor analysis during transient operation
    Autorzy:
    Dominiczak, K.
    Banaszkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/175490.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steam turbine
    thermal stress
    thermal growth
    differential expansion
    Opis:
    This paper presents a verification approach to thermoelastic steam turbine rotor analysis. Neither temperature nor stresses are measured on the rotor surface in utility power plants. Therefore analysis of the steam turbine rotor can be verified only based on absolute and differential thermal expansion measurements in vicinity of the steam turbine. Absolute and differential expansion measurements and steam turbine fixed points arrangement allow to calculate thermal growth of the steam turbine rotor during transients. Thermal growth of the rotor can be a baseline for the calculation using a numerical model.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 131; 55-65
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in aerodynamic parameters for 5-stage steam turbine during warming and gradual start-up to nominal operating parameters
    Autorzy:
    Hoznedl, M.
    Bednář, L.
    Tajč, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/175267.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steam turbine
    experimental measurement
    warming
    start-up
    efficiency
    Opis:
    The results of experiments on the 5-stage steam turbine are presented. The parameters of individual stages as well as the whole turbine are observed during the gradual start-up to nominal operating parameters. The pressures and temperatures are shown at stages in idling, heating up the experimental turbine and during the transition to operating speed. A greater attention is devoted to three selected operational conditions with different processed enthalpy drops. Problems with efficiency and enthalpy drops measurement during warming are described. The attempts to measure flow parameters quickly and without time for heating of turbine casings and other parts are often in the experimental research caused byprice of the survey. This contributionÞs task is to inform about these situations and to avoid confused and untrue results obtained by somewhat hasty measurements due to reduction and optimisation of costs.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 134; 45-62
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utilisation of bleed steam from power plant to increase saturation temperature in organic Rankine cycle
    Autorzy:
    Mikielewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175333.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ORC
    increase of upper source temperature
    bleed steam utilisation
    Opis:
    In the paper presented is a novel concept to utilize the heat from the turbine bleed to improve the quality of working fluid vapour in the organic Rankine cycle (ORC), which contributes to the increase of ORC efficiency and the overall efficiency of the combined system of the power plant and ORC plant. Calculations have been accomplished for the case when available is waste heat as a flow rate of hot water at a temperature of 90 ◦C, which is used for preliminary heating of working fluid in ORC cycle. That hot water is obtained as a result of conversion of exhaust gases from power plant to the energy of hot water. Then the working fluid in ORC is further heated by the bleed steam to reach 120 ◦C. Such vapour is subsequently directed to the turbine. Possible working fluids were examined, namely R134a, silicone oils MM and MDM, toluene, and ethanol. Only under conditions of 120 ◦C/40 ◦C the silicone oil MM showed the best performance, in all other cases the ethanol proved to be best performing fluid of all. Results are compared with the ‘stand alone’ ORC module showing its superiority.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 21-32
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A methodology for online rotor stress monitoring using equivalent Green’s function and steam temperature model
    Autorzy:
    Banaszkiewicz, M.
    Dominiczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/175458.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Steam turbine
    thermal stress
    Green's functions
    Duhamel’s integral
    Opis:
    The requirement of high operational flexibility of utility power plants creates a need of using online systems for monitoring and control of damage of critical components, e.g., steam turbine rotors. Such systems make use of different measurements and mathematical models enabling calculation of thermal stresses and their continuous control. The paper presents key elements of the proposed system and discusses their use from the point of view of thermodynamics and heat transfer. Thermodynamic relationships, well proven in design calculations, were applied to calculate online the steam temperature at critical locations using standard turbine measurements as input signals. The model predictions were compared with operational data from a real power plant during a warm start-up and show reasonably good accuracy. The effect of variable heat transfer coefficient and material properties on thermal stresses was investigated numerically by finite element method (FEM) on a cylinder model, and a concept of equivalent Green’s function was introduced to account for this variability in thermal stress model based on Duhamel’s integral. This approach was shown to produce accurate results for more complicated geometries by comparing thermal stresses at rotor blade groove computed using FEM and Duhamel’s integral.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 133; 13-37
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Goliński-Jesionek multistage combined air/steam systems with external combustion
    Autorzy:
    Gnutek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/175431.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    binary cycles
    combined cycles
    external combustion
    air/steam power plants
    Opis:
    In the paper a brief review of an air/steam set of thermodynamic cycles dedicated for energy production is presented. The main aim of this work is show to the Goliński-Jesionek multistage combined air/steam plants which improve efficiency. For this purpose, systems are first studied and secondly new concept is presented.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 33-54
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the effectiveness of the turbine condenser air extraction system using hydro ejectors
    Autorzy:
    Badur, J.
    Kowalczyk, T.
    Ziółkowski, P.
    Tokarczyk, P.
    Woźniak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/175162.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    condensation
    steam condenser
    Venturi nozzle
    Dalton’s law
    partial pressure
    Opis:
    The aim of the paper is to investigate the effectiveness of the 18K380 steam turbine condenser air extraction system using hydro ejectors. Motivation for the analysis was a need of improvement of the energy conversion ratio of the power plant. To achieve this goal it was necessary to establish efficiency of each subsystem of the energy cycle. The air extraction system is not a highly power consuming system but it has great impact on the steam cycle efficiency by influence on the condensation temperature. The air extraction system effectiveness depends on a weather conditions, exactly on the ambient temperature, which raises the question whether it is worth to modernize the hydro ejectors or replace them by a centrifugal vacuum pumps. To establish the vacuum system effectiveness a new innovative mass flow measuring system has been implemented to measure an air-steam mixture flow and the fraction of the air mass in the mixture. The measuring system is based on a Venturi nozzle supplemented with a temperature drop during the mixture expansion.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 131; 41-53
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adress for Professor Krzysztof Jan Jesionek Anniversary
    Autorzy:
    Lewandowski, J.
    Gnutek, Z.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175358.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steam and gas turbine
    power boiler
    compressors
    fluid-flow machinery
    power plants
    Opis:
    This article presents professional activity of Krzysztof Jesionek within the background of his personal career in the field of heat and power engineering on Wrocław University of Technology. In particular, we present stages of scientific and professional development with an emphasis on nature Professor Jesionek’s career main driving forces as a result of his cooperation with industry and power engineering.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 3-20
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The analyzis of the stream-air mixture during a flow through a tube bank inside a condenser
    Autorzy:
    Krzyślak, P.
    Joachimiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/175261.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    condenser
    pressure drop
    steam-air mixture
    water vapor condensation in a solution with air
    partial pressure
    Opis:
    The paper presents the results of calculations related to the flow analysis of a tube bank taking into account the partial pressures of gases flowing through the condenser. Different mass share of the gas not condensing in the heat exchanger upstream to the first row of tubes and the partial pressures of water vapor and air have been taken into account. The value of the partial pressures of gases, pressures drop, temperature, velocity, Reynolds number, and air share in the subsequent rows of tubes have been calculated. This study is a basis for the analysis of heat exchange in the condenser considering the influence of the noncondensing gas. The increase in the share of air in the following rows of tubes results in an increase in the thermal resistance and condensation of increasingly lower mass of water vapor.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 131-140
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Clean gas technologies - towards zero-emission repowering of Pomerania
    Autorzy:
    Ziółkowski, P.
    Badur, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175502.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    clean gas technologies
    clean coal technologies
    zero emission
    thermodynamic cycle
    steam-gas turbine
    oxy combustion
    carbon capture storage
    Opis:
    In the paper a brief review of processes for energy conversion developed recently within the framework of clean gas te chnologies is presented, in cluding projects for future repowering of Pomerania. The main aim of this work is to show the diferent thermodynamcs cycles which improve efficiency and/or decrease emissions such as: Cheng cycle, Szewalski cycle, LOTHECO cycle, hybrid pSOFC/GT cycle, inverse Brayton cycle, low-emission cycle and zero-emission cycle. For that purpose,cycles and results of analysis are frst studied and, secondly, new concept is presented. The role of coupled analysis 0D and 3D in cycle's devices is also discussed.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 51-80
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies