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    Wyświetlanie 1-7 z 7
    Tytuł:
    A study of CFD simulations of the flow pattern in an agitated system with a pitched blade worn turbine
    Autorzy:
    Skocilas, J.
    Fort, I.
    Jirout, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/185244.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pitched blade impeller
    erosion wear
    ensemble-average mean velocity
    impeller
    pumping capacity
    CFD simulation
    prędkość uśredniona
    wirnik
    wydajność pompy
    symulacji CFD
    Opis:
    This paper presents a numerical analysis of an agitated fully baffled cylindrical vessel with a down pumping four blade worn or unworn pitched blade impeller (= 45[degrees] and 30[degrees]) under a turbulent flow regime. CFD simulations predict the pumping capacity of the system equipped by worn and unworn pitched blade impeller. Experimental data were taken from the authors’ previous work and compared with results of numerical computations. A good agreement with experimental data was obtained. The ensemble-average mean velocity field with worn and unworn impellers was computed. It follows from the simulation results that the wear rate of the impeller blade has a significantly negative effect on the velocity distribution in an agitated liquid. The greater the destruction of the worn blade, the higher is the deformation of the velocity field around the rotating impeller, with a simultaneous decrease in impeller pumping capacity.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 1; 39-49
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of exit blade angle, viscosity and roughness in centrifugal pumps investigated by CFD computation
    Autorzy:
    Li, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934039.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Gdańska
    Tematy:
    centrifugal pump
    impeller
    volute
    viscosity
    performance
    blade angle
    viscous oil
    Opis:
    It has long been known that the exit blade angle plays a very important role in the performance of a centrifugal pump handling water or viscous oil. The effect of exit blade angle on the performance and flow of centrifugal pumps is usually investigated experimentally. However, due to the high cost and limited data that can be obtained by experiment, currently there is a great need for this effect to be studied numerically by means of computational fluid dynamics (CFD). At present, extensive comparisons between experiment and simulation regarding the performance of viscous oil and flow in centrifugal pumps with different exit blade angles are not available. Hydraulic performance and flow details in the impeller and the volute of a centrifugal pump with an exit blade angle of 44o were investigated numerically with the CFD code Fluent, using water and viscous oil as the working fluid, respectively. The effect of exit blade angle was then elucidated by comparing the performance and flow with that of a pump with an exit blade angle of 20o. It was determined that the results for the performance and flow obtained by means of CFD were in qualitative agreement with the observations. The sudden-rising-head effect is dependent on roughness and viscosity. The unstable zone in the theoretical head curve of the impeller at a low flow rate was attributed to the strong reaction of the volute to the flow in the vicinity of the impeller exit. The flow in the impeller with a large exit blade angle was subject to separation near the blade pressure side, however, a large exit blade angle helped improve the pump performance of viscous oil.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2011, 15, 1; 21-41
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical Modelling of Degassing Process by Blowing of Inert Gas
    Autorzy:
    Michalek, K.
    Tkadlečková, M.
    Socha, L.
    Gryc, K.
    Saternus, M.
    Pieprzyca, J.
    Merder, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/351001.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    physical modelling
    refining ladle
    inert gas blowing
    degassing process
    impeller
    Opis:
    This paper deals with the possibilities of using physical modelling to study the degassing of metal melt during its treatment in the refining ladle. The method of inert gas blowing, so-called refining gas, presents the most common operational technology for the elimination of impurities from molten metal, e.g. for decreasing or removing the hydrogen content from liquid aluminium. This refining process presents the system of gas-liquid and its efficiency depends on the creation of fine bubbles with a high interphase surface, uniform distribution, long period of its effect in the melt, and mostly on the uniform arrangement of bubbles into the whole volume of the refining ladle. Physical modelling represents the basic method of modelling and it makes it possible to obtain information about the course of refining processes. On the basis of obtained results, it is possible to predict the behaviour of the real system during different changes in the process. The experimental part focuses on the evaluation of methodical laboratory experiments aimed at the proposal and testing of the developed methods of degassing during physical modelling. The results obtained on the basis of laboratory experiments realized on the specific physical model were discussed.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 987-992
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cavitation wear of pump impellers
    Zużycie kawitacyjne wirników pomp
    Autorzy:
    Szala, M.
    Łukasik, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/101826.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Lubelska. Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    pump
    impeller
    cavitation
    cavitation erosion
    wear
    pompa
    wirnik
    kawitacja
    erozja kawitacyjna
    zużycie
    Opis:
    Cavitation is a common phenomenon in pump systems, negatively influencing their operating parameters and components such as impellers and, thus, causing considerable financial losses. This paper explains the problem of cavitation and cavitation erosion. The causes of cavitation in pump systems are analyzed. A selection of centrifugal pump impellers damaged by cavitation erosion are presented and examined. The authors also discuss ways of preventing cavitation and cavitation erosion in pump systems. Finally, relevant conclusions are drawn.
    Kawitacja w układach pompowych jest zjawiskiem powszechnym, oddziaływującym negatywnie na parametry pracy oraz podzespoły pomp np. wirniki, przyczyniając się do dużych strat finansowych. W pracy wyjaśniono pojęcie kawitacji i erozji kawitacyjnej. Przedstawiono przyczyny występowania kawitacji w układach pompowych. Scharakteryzowano przykłady uszkodzonych w wyniku działania erozji kawitacyjnej wirników pomp wirowych. Omówiono sposoby zapobiegania kawitacji i erozji kawitacyjnej w układach pompowych, oraz sformułowano adekwatne wnioski.
    Źródło:
    Journal of Technology and Exploitation in Mechanical Engineering; 2016, 2, 1; 40-44
    2451-148X
    Pojawia się w:
    Journal of Technology and Exploitation in Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of forced spatial vibrations of a centrifugal pump impeller with axial forces balancing device
    Autorzy:
    Zhulyov, A.
    Martsinkovsky, V.
    Kundera, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/265211.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    wibracje
    promieniowanie
    wirnik
    pompa
    vibrations–radial
    angular
    axial
    rotor
    impeller
    partial systems
    self-centering
    shaftless pump
    Opis:
    In this paper, a model of a pump impeller with annular seals and a balancing device, used as a combined support-seal assembly, is considered. The forced coupled radial, angular and axial vibrations of the rotor are determined with consideration of linearized inertial, damping, gyroscopic, positional and circulating forces and moments acting on the impeller from the side of the fluid flow in annular seals. The theoretical analysis is supplemented with a numerical example, the amplitude frequency characteristics are shown.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 3; 737-750
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Optimization Parameters on the Efficiency of Aluminium Melt Refining by using Physical Modelling
    Autorzy:
    Walek, Josef
    Michalek, Karel
    Tkadlečková, Markéta
    Powiązania:
    https://bibliotekanauki.pl/articles/2174623.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    physical modelling
    refining ladle
    blowing of inert gas
    degassing of the melt
    impeller
    modelowanie fizyczne
    kadź rafinacyjna
    wdmuchiwanie gazu obojętnego
    odgazowanie stopu
    wirnik
    Opis:
    The article describes the influence of optimization parameters on the efficiency of aluminium melt refining by using physical modelling. The blowing of refining gas, through a rotating impeller into the ladle is a widely used operating technology to reduce the content of impurities in molten aluminium, e.g. hydrogen. The efficiency of this refining process depends on the creation of fine bubbles with a high interphase surface, wide-spread distribution, the residence time of its effect in the melt, and mostly on the wide-spread dispersion of bubbles in the whole volume of the refining ladle and with the long period of their effect in the melt. For physical modelling, a plexiglass model on a scale of 1:1 is used for the operating ladle. Part of the physical model is a hollow shaft used for gas supply equipped with an impeller and also two baffles. The basis of physical modelling consists in the targeted utilization of the similarities of the processes that take place within the actual device and its model. The degassing process of aluminium melt by blowing inert gas is simulated in physical modelling by a decrease of dissolved oxygen in the model liquid (water).
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 3; 60--66
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FEM numerical simulation of contact stresses between driving shaft and hub impeller of fuel pump
    Autorzy:
    Wiater, M.
    Chladek, G.
    Żmudzki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201038.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    fibre reinforcement composite
    fuel pump
    impeller
    shaft
    hub wear
    contact stress
    finite elements analysis
    FEA
    kompozyty wzmocnione włóknami
    pompa paliwa
    wirnik
    wał
    zużycie piasty
    naprężenia kontaktowe
    analiza elementów skończonych
    Opis:
    Purpose: The aim of the work was to test the contact stresses in the model system of the turbine hub cooperating with the fuel pump drive shaft. The hypothesis of the work was that, by means of FEA, it is possible to assess the contact stresses in the materials of the turbine hub and the fuel pump shaft during torque transmission. Design/methodology/approach: A turbine with fibre-reinforced polyphenylene sulphide (PPS) composite cooperating with a stainless steel shaft (X46Cr13/1.4034) in a commonly used D-flat shape joint was selected for the experimental research. To assess contact stresses, the CAD model (NX, Siemens) of the entire turbine was limited to the hub area. The drive shaft is supported in accordance with the bearing in the fuel pump, and the possibility of rotation about the axis along the length of the torque-producing magnet is taken away. The system was loaded with a torque of 200 Nmm on the turbine. The turbine hub and shaft were calculated, taking into account the phenomenon of contact detachment or slip at the value of the friction coefficient of 0.1. Findings: The pressure transmission area was found in the area at the edge of the flat surface D-flat and on the opposite side of the D-convexity. The contact stresses on the D-flat side reached values close to the composite strength. Research limitations/implications: The studies did not take into account the technological inaccuracies, thermal deformation, local material properties, and wear. The value of the friction coefficient was not measured in realistic conditions with fuel lubrication. Practical implications: FEA has been achieved, which allows to reduce the cost of experimental research. Originality/value: The proposed model allows for further studies of the influence of elasticity of various materials and structures on contact stresses in order to assess wear resistance.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 113, 1; 13--21
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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