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Wyświetlanie 1-10 z 17
Tytuł:
Approach to Impact Assessment of the Rated Power Uprate of NPP Unit on the Service Life of the Turbine Critical Elements
Autorzy:
Chernousenko, Olga
Nikulenkova, Tetyana
Peshko, Vitaliy
Nikulenkov, Anatolii
Powiązania:
https://bibliotekanauki.pl/articles/1811575.pdf
Data publikacji:
2020
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
nuclear power plant
reliability
turbine
steam flow
computational fluid dynamics
high pressure rotor
service life
long-term strength
low cycle fatigue
Opis:
Nuclear power plants play an important role in power systems of many countries. Ability to reasonable increase installed capacity of nuclear power units allow to reduce the cost for building of new power plants. When increasing NPP capacity to 104% there is a need to estimate the residual life of plant’s typical elements and continue their operation. The mathematical model of estimation of service life indicators of steam turbine K-1000-60/3000 is developed. The effect of increasing the capacity of a nuclear reactor on the heat transfer coefficients of a steam in the nozzle segments of high-pressure cylinder was established by using CFD modeling. The thermal and stress-strain state of the high-pressure rotor for the most typical operating modes are calculated. Using the correlation dependences of low-cycle fatigue, the rate of accumulation of cyclic damage of the base metal is established. The resistance of the metal to the exhaustion of long-term strength is also determined. On the example of the high pressure rotor of the 3rd power unit of Rivne NPP the service life indicators are calculated. The validity of increasing the installed capacity of the power unit was also confirmed.
Źródło:
Rocznik Ochrona Środowiska; 2020, Tom 22, cz. 1; 105-116
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposal of modernisation of a steam turbine stage before extraction, CFD and CSD analysis
Autorzy:
Gardzielewicz, A.
Karcz, M.
Marcinkowski, S.
Bielecki, M.
Badur, J.
Malec, A.
Banaszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1931599.pdf
Data publikacji:
2002
Wydawca:
Politechnika Gdańska
Tematy:
steam turbine stage
flow and stress optimisation
Opis:
The paper presents an idea and analysis of application of a new solution of a stage before extraction in the modernised LP part of 200MW turbines with ND exhaust. The idea of the patent is to introduce to the turbine steam path a ring directing high energy tip leakage steam from the stage to the regenerative extraction. Owing to this it is possible to cheaply achieve some energy benefits from the operation of first heat exchanger which in the modernised 200MW turbine is continuously underheated. Ring design has been checked using CFD and CSD numerical codes.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 4; 577-589
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polish aspects in the modern design solutions of steam turbine flow systems
Autorzy:
Gardzilewicz, A.
Obrzut, D.
Szymaniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/259290.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
steam turbine
power cycles
flow systems
efficiency
errosion
Opis:
This paper presents new solutions of turbine stages which have been applied to high-power steam turbine flow systems. The structures, elaborated in Poland, were designed with the use of the authors’ original computational software and verified by measurements performed on real turbine sets.
Źródło:
Polish Maritime Research; 2009, S 1; 14-21
1233-2585
Pojawia się w:
Polish Maritime Research
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:
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:
Applicability of flow simulation models to the case of radial inflow onto a rotating core
Autorzy:
Biernacki, R.
Powiązania:
https://bibliotekanauki.pl/articles/1955813.pdf
Data publikacji:
2001
Wydawca:
Politechnika Gdańska
Tematy:
turbulent flow
numerical flow simulation
flow simulation models
steam turbines
turbine inlet
computational fluid dynamics CFD
Opis:
The paper presents the results of fluid flow simulations carried out by means of the FIDAP7.6 program (a fluid dynamics FEM package) for the case of radial inflow onto a rotating shaft. The particular geometric configuration has been chosen to resemble a generalized inlet chamber of twin low-pressure steam turbines, but with the axial outlet section extended to allow better observation of flow instabilities in that region. The calculations were carried out for the same channel geometry for both compressible and incompressible flow, using the same or slightly varying boundary conditions. Extensive variation in non-physical parameters of the model was explored, such as applying different meshes over the region, as well as utilizing different turbulence and upwinding models. The intent of this research was to evaluate the relative applicability of the various available flow models to the simulation of axisymmetric flows with steep velocity gradients, and to discover the limitations of these models. The calculations have in fact established significant differences in the behavior of the simulated flow for the different meshes and models. Some results were characterized by extensive areas of recirculating flow whereas others, for the same boundary conditions, showed no recirculation. Correct near-wall meshing as well as the choice of the upwinding scheme were established as the critical factors in this regard. There was also noticeable variation in outlet velocity profiles. An extensive zone of separation within the investigated channel as well as a standing annular vortex near the point of stagnation are flow features of some interest. These patterns of flow change in response to the changing non-physical parameters; the separation zone in particular is absent or slow to develop under some setups. The influence of inflow parameters, the initial velocity distribution and turbulent intensity in particular, on flow behavior in contact with the rotating shaft have also been an area of investigation, as these are often defined with considerable uncertainty in practical applications. It was observed that some latitude in assuming these parameters did not significantly alter the relevant flow parameters at outlet (the velocity and pressure distributions), although it did induce variation in other aspects of the flow (such as the extent of the standing vortex).
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 2; 141-154
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wnikanie ciepła z warstewki smoły w przepływie dwufazowym z parą wodną
Heat transfer in two-phase tar - steam film flow
Autorzy:
Filipczak, G.
Powiązania:
https://bibliotekanauki.pl/articles/2070792.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
przepływ dwufazowy
smoła
para wodna
two-phase flow
tar
steam
Opis:
Opisano warunki procesowe wynikające z odparowania smoły węglowej w przepływie pierścieniowym z parą wodną. Dokonano oceny wpływu parametrów cieplno-przepływowych na wartość współczynnika wnikania ciepła, zarówno w zakresie odwadniania smoły (układ trójfazowy smoła — woda — para wodna nasycona) jak i odparowania ze smoły frakcji olejowych (układ dwufazowy smoła — para wodna przegrzana).
Conditions of heat transfer process in annular tar - steam flow are described. An influence of heating and flowing parameters on heat transfer coefficient is evaluated both on tar dewatering (tar - water - saturated vapour system) and evaporation of tar oils (two-phase tar — steam flow system).
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 6; 68-69
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of last stage blade of 13K215 turbine intermediate pressure module
Autorzy:
Bondyra, Radosław
Przytulski, Jan
Dominiczak, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2091352.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
efficiency
strength calculation
steam turbine
last stage blade
fluid flow
calculation
Opis:
Paper is considering the purpose and the process of development of last stage blade for intermediate pressure module of 13K215 steam turbine. In the last 20–30 years most of the steam turbine manufacturers were focused on improving such a turbine mainly by upgrading low pressure module. In a result of such a modernization technology were changed from impulse to reaction. The best results of upgrading were given by developing low pressure last stage blade. With some uncertainty and based on state of art knowledge, it can be stand that improving of this part of steam turbine is close to the end. These above indicators show an element on which future research should be focused on – in the next step it should be intermediate pressure module. In the primary design the height of intermediate pressure last stage blade was 500 mm but because of change of technology this value was decreased to 400 mm. When to focus on reaction technology, the height of the last stage blade is related to output power and efficiency. Considered here is the checking the possibility of implementing blades, in a reaction technology, higher than 400 mm and potentially highest. Article shows a whole chosen methodology of topic described above. It leads through the reasons of research, limitations of 13K215 steam turbine, creation of three-dimensional models, fluid flow calculations, mechanical integrity calculations and proposed solutions of design.
Źródło:
Archives of Thermodynamics; 2022, 43, 1; 45--62
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
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:
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
Wyświetlanie 1-10 z 17

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