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Wyświetlanie 1-15 z 24
Tytuł:
Modelowanie 3D procesu napełniania w silniku o ZI
3D modeling of the SI engine intake process
Autorzy:
Pietrykowski, K.
Wendeker, M.
Grabowski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/395475.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
modelowanie CFD
proces napełniania
CFD modeling
intake process
Opis:
W Politechnice Lubelskiej powadzone są prace mające na celu opracowanie systemu zasilania wodorem silnika o ZI. W celu poznania zjawisk zachodzących podczas procesu napełniania silnika przeprowadzono badania modelowe z wykorzystaniem oprogramowania AVL Fire. W artykule przedstawiono wyniki badań modelowych ilustrujące zjawiska związane z przepływem powietrza przez kanały dolotowe silnika jak również ruch powietrza w komorze spalania.
Hydrogen supply system for SI engines is developed in Lublin University of Technology. To learn the phenomena that occur during the engine filling process, AVL based modeling was performed. This paper describes the results of the modeling studies to show the air flow through engine intake duct and the air movement in the combustion chamber.
Źródło:
Postępy Nauki i Techniki; 2012, 15; 123-133
2080-4075
Pojawia się w:
Postępy Nauki i Techniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydraulic mixing modelling in reactor for biogas production
Autorzy:
Chmielewski, A. G.
Berbeć, A.
Zalewski, M.
Dobrowolski, A.
Powiązania:
https://bibliotekanauki.pl/articles/185258.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
biogas
biomass mixing
bioreactor
CFD modeling
biogaz
mieszanie biomasy
bioreaktor
modelowanie CFD
Opis:
Two-stage biogas production plant consists of two reactors: a hydrolyser and a fermentor. The bioreactor construction has to meet three requirements: low cost and simplicity of construction and good biomass mixing conditions with an application of appropriate method. This paper reports CFD modelling of hydraulic mixing in the tank to be applied in a two-stage industrial installation.
Źródło:
Chemical and Process Engineering; 2012, 33, 4; 621-628
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer modeling of a convective steam superheater
Autorzy:
Trojan, M.
Powiązania:
https://bibliotekanauki.pl/articles/240867.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
superheater
steam boiler
CFD modeling
ash fouling
przegrzewacz
kocioł parowy
modelowanie CFD
zanieczyszczenia popiołowe
Opis:
Superheater is for generating superheated steam from the saturated steam from the evaporator outlet. In the case of pulverized coal fired boiler, a relatively small amount of ash causes problems with ash fouling on the heating surfaces, including the superheaters. In the convection pass of the boiler, the flue gas temperature is lower and ash deposits can be loose or sintered. Ash fouling not only reduces heat transfer from the flue gas to the steam, but also is the cause of a higher pressure drop on the flue gas flow path. In the case the pressure drop is greater than the power consumed by the fan increases. If the superheater surfaces are covered with ash than the steam temperature at the outlet of the superheater stages falls, and the flow rates of the water injected into attemperator should be reduced. There is also an increase in flue gas temperature after the different stages of the superheater. Consequently, this leads to a reduction in boiler efficiency. The paper presents the results of computational fluid dynamics simulations of the first stage superheater of both the boiler OP-210M using the commercial software. The temperature distributions of the steam and flue gas along the way they flow together with temperature of the tube walls and temperature of the ash deposits will be determined. The calculated steam temperature is compared with measurement results. Knowledge of these temperatures is of great practical importance because it allows to choose the grade of steel for a given superheater stage. Using the developed model of the superheater to determine its degree of ash fouling in the on-line mode one can control the activation frequency of steam sootblowers.
Źródło:
Archives of Thermodynamics; 2015, 36, 1; 125-137
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling and measurement of bubble formation and growth in electroflotation processes
Autorzy:
Sarkar, S. K.
Machniewski, P.M.
Evans, G.M.
Powiązania:
https://bibliotekanauki.pl/articles/184977.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electroflotatio
bubble diameter
detachment
mass transfer
CFD modeling
średnica bańki
oderwanie
masa transferu
modelowanie CFD
Opis:
Electroflotation is used in the water treatment industry for the recovery of suspended particles. In this study the bubble formation and release of hydrogen bubbles generated electrolytically from a platinum cathode was investigated. Previously, it was found that both the growth rate and detachment diameter increased with increasing wire diameter. Conversely, current density had little effect on the released bubble size. It was also found that the detached bubbles rapidly increased in volume as they rose through the liquid as a result of decreasing hydrostatic pressure and high levels of dissolved hydrogen gas in the surrounding liquid. The experimental system was computationally modelled using a Lagrangian-Eulerian Discrete Particle approach. It was revealed that desorption of gaseous solutes from the electrolyte solution, other than hydrogen, may have a significant impact on the diameter variation of the formed bubbles. The simulation confirmed that liquid circulation, either forced or induced by the rising bubble plume, influences both the hydrogen supersaturation (concentration) in the neighbourhood of the electrode and the size of the resulting bubbles.
Źródło:
Chemical and Process Engineering; 2013, 34, 3; 327-336
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
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:
Determination of the flow characteristic of a high-rotational centrifugal pump by means of CFD methods
Autorzy:
Dykas, S.
Wilk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1943238.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska
Tematy:
centrifugal pump
CFD modeling
flow characteristic
Opis:
The paper refers to a numerical analysis of the flow through a centrifugal pump working at high rotational speed. This kind of a pump is characterized by a high delivery head and a low discharge. The considered pump is a one-stage centrifugal pump with a rotational speed of 12 000 rpm. This pump has been manufactured and prepared for experimental research. The main purpose of the presented research has been to determine the flow characteristic of the pump by means of CFD methods. To this end the commercial CFD code, ANSYS CFX 11, has been used. The obtained numerical results have shown high usefulness of the CFD methods for the flow machinery design process. In the next step the obtained flow characteristic will be compared with the experimental investigations.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2008, 12, 3-4; 245-253
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of aerodynamic parameters of solar plane airfoil using CFD modeling
Autorzy:
Jaszczur, Marek
Papis, Karolina
Książek, Michał
Czerwiński, Grzegorz
Wojtas, Gabriel
Koncewicz, Wojciech
Nabożna, Sylwia
Wójcik, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2097896.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
solar plane
aerodynamic parameters
CFD modeling
Opis:
The technology of solar-powered aerial vehicles requires enormous financial support and further development. For this purpose, the computational fluid dynamic can be used. In order to carry out necessary analyses and model development in this research, ANSYS Fluent software was used. Using the first version of the AGH Solar Plane model, preliminary analysis of lift, drag and tearing off the stream was performed. Four new geometries were prepared on which the flattening of upper surfaces for fixing solar panels was tested. The results were validated in the aerodynamic tunnel using particle image velocimetry method. Taking into account all analyses, a number of recommendations have been prepared that will be implemented to create an aircraft, which meets all target requirements.
Źródło:
Computer Science; 2021, 22 (1); 123-142
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CFD model of a magnetorheological fluid in squeeze mode
Autorzy:
Sapiński, B.
Szczęch, M.
Powiązania:
https://bibliotekanauki.pl/articles/386683.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
MR fluid
squeeze mode
CFD modeling
Bingham model
ciecz MR
ciecz magnetoreologiczna
model CFD
model Binghama
Opis:
The study briefly outlines a CFD model of a magnetorheological (MR) fluid operated in squeeze mode with a constant interface area using the CFD (Computational Fluid Dynamics) approach. The underlying assumption is that the MR fluid is placed between two surfaces of which at least one can be subject to a prescribed displacement or a force input. The widely employed Bingham model, which fails to take into account the yield stress variations depending on the height of the gap, has been modified. Computation data obtained in the ANSYS CFX environment are compared with experimental results.
Źródło:
Acta Mechanica et Automatica; 2013, 7, 3; 180-183
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulacja przepływu płynu w kadzi wirowej o wielopunktowym napełnianiu
Fluid flow simulation in a whirlpool tank of multi-point inflow
Autorzy:
Sterczyńska, M.
Jakubowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/288058.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
kadź wirowa
modelowanie CFD
symulacja przepływu
przepływ wtórny
whirlpool separator
CFD modeling
fluid flow simulation
secondary flow
Opis:
Praca prezentuje porównanie wyników uzyskanych dla modelu symulacyjnego CFD (Coputational Fluid Dynamcs) kadzi wirowej o napełnianiu jednostronnym (klasycznym) i zwielokrotnionym po obwodzie. Przedmiotem analizy było określenie wpływu zastosowania napełniania z wykorzystaniem czerech otworów rozmieszczonych symetrycznie na płaszczyźnie płaszcza zbiornika kadzi wirowej na występowanie przepływ wtórnego odpowiedzialnego za formowanie się stożka osadu gorącego. Analiza czasów formowania oraz wartości prędkości maksymalnej przepływu wtórnego który jest odpowiedzialny za powstawania specyficznego kształtu stożka osadu wykazała zróżnicowanie wyników w zależności od wariantu napełniania. W odniesieniu do klasycznego napełniania korzystniejsze warunki (skrócenie czasu powstawania przepływu formującego stożek osadu oraz wyższą wartość prędkości) uzyskano przy napełnianiu wielostronnym.
The paper presents the comparison of simulation results obtained for the Computational Fluid Dynamics CFD) model of the whirlpool tank of one-sided inflow (classic) and multiplied by the circumference. The subject of the analysis was to determine the effect of using four inlets placed symmetrically on a whirlpool plane of the tank on the occurrence of the secondary flow which is responsible for the formation of the hot trub cone. Analysis of the formation time and the speed of the secondary flow which is responsible for the formation of the specific shape of the cone of sediment results showed differences depending on the variant of the filling. With respect to the classical filling better conditions (shorter cone formation forming sediment flow and higher speed) achieved during the filling multilateral.
Źródło:
Inżynieria Rolnicza; 2012, R. 16, nr 3, 3; 227-235
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania numeryczne wpływu wysokości zawieszenia mieszadła PBT na jakość wytwarzanej zawiesiny lekkiej
Numerical study of the effect of PBT impeller position on a quality of floating particles suspension
Autorzy:
Kacperski, Ł.
Karcz, J.
Powiązania:
https://bibliotekanauki.pl/articles/2073121.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mieszanie mechaniczne
zawiesina lekka
modelowanie CFD
pozycja mieszadła
agitation
suspension of floating particles
CFD modeling
impeller position
Opis:
Przeprowadzono numeryczną analizę wpływu wysokości zawieszenia mieszadła PBT na jakość zawiesiny lekkiej w zbiorniku z przegrodami. Obliczenia numeryczne wykonano w oprogramowaniu ANSYS CFX 16.1 dla mieszalnika o średnicy wewnętrznej D = 0,295 m. Wysokość h zawieszenia mieszadła w zbiorniku wynosiła 0,67; 0,78 lub 0,89H. Na podstawie otrzymanych rozkładów stężenia cząstek ciała stałego w cieczy stwierdzono, że w zakresie przeprowadzonych obliczeń, profile stężenia cząstek istotnie zależą od pozycji mieszadła w zbiorniku.
A numerical analysis of the effect of PBT impeller position on a quality of floating particles suspension produced in a baffled agitated vessel was carried out. The numerical computations were performed for a vessel of inner diameter D = 0.295 m, using ANSYS CFX 16.1 software. The off-bottom clearance of the impeller was equal to 0.67, 0.78 or 0.89H. On the basis of obtained distributions of particles concentration in liquid it was proved that, within the range of performed computations, the profiles of particles concentration significantly depended on the impeller position.
Źródło:
Inżynieria i Aparatura Chemiczna; 2015, 6; 328--329
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of dustiness state in a driven underground dog heading ventilating by auxiliary air-duct
Autorzy:
Brodny, Jarosław
Tutak, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/410090.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
dust
CFD modeling
dog heading
mining exploitation
Opis:
Dustiness of the mine atmosphere during carrying out exploitation is one of the most hazardous factors threaten to health and life of employees. Also it is large hazard for all type of mechanical and electrical devices operating in mining headings. Coal dust is also very dangerous due to its possibility of explosion. Currently applied technologies of rock mass mining process, entire transport process of output and applied ventilation system cause that rock and coal dust is presented practically in each of the mining heading. Practically, is impossible to eliminate dust from mining headings. However, one can determine its parameters and potential ways its displacement. In the paper there is presented modeling research methodology of dustiness state in a driven dog heading. Developed model is the basis for this methodology, including the diphase flow of mixture of air and dust in the mining heading. Analysis was performed for real driven dog heading. Based on performed analyses, distributions of particular fraction and movement trajectories of selected dust grains were determined. Developed methodology gives a lot of opportunities for analysis of dustiness state in mining headings and in other compartments. It enables to determine parameters of particular grains and their impact on ventilation parameters of the air stream in the tested headings. Obtained results can also be used to reduce dust hazard.
Źródło:
Management Systems in Production Engineering; 2020, 2 (28); 73-77
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of unsteady flow forces on the thermowell of steam temperature sensor
Autorzy:
Kornet, S.
Sławiński, D.
Ziółkowski, P.
Badur, J.
Powiązania:
https://bibliotekanauki.pl/articles/175578.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
unsteady flow
resonance
CFD modeling
CSD modeling
Opis:
In this paper, 3D numerical analysis of unsteady flow forces acting on the thermowell of steam temperature sensor is presented. According to that purpose, the CFD+CSD (computational fluid–solid dynamics) approach has been used. The nonstationary of fluid acting on the thermowell such as: Strouhal frequency, amplitude of pressure, structure of vortex, peak of pressure, field of pressure, field of velocity, etc. are studied analytically and numerically. There have been examined two cases of flow with changing both temperature, pressure and mass flow rate (operating daily and night in the unit with capacity of 380 MWe). In accordance with the standards ASME PTC 19.3 TW-2010 the possibility of entry into resonance has been examined.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 129; 25-49
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance comparison of different aerodynamic shapes for autonomous underwater vehicles
Autorzy:
Khalin, Anatoliy
Kizilova, Nataliya
Powiązania:
https://bibliotekanauki.pl/articles/139785.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
autonomous underwater vehicle
aerodynamic performance
lifting force
CFD modeling
autonomiczny pojazd podwodny
wydajność aerodynamiczna
siła podnoszenia
modelowanie CFD
Opis:
A brief review of the existing autonomous underwater vehicles, their types, design, movement abilities and missions is presented. It is shown, the shape optimization design and enhancement of their efficiency is the main problem for further development of multipurpose glider technologies. A comparative study of aerodynamic performance of three different shape designs (the airfoil NACA0022 based (I), flattened ellipsoidal (II) and cigar-type (III) bodies of the same volumes) has been carried out. Geometrical modelling, meshing and computational fluid dynamics (CFD) simulations have been carried out with AnSys15.0. The pathlines and wall shear stress distributions have been computed to understand the advantages and disadvantages of each shape. The lift and drag coefficients, aerodynamic quality, power index and pitching moment have been computed. The higher efficiency of the shape I/shape II at higher/lower angles of attack (greater than 20o and less than 20o) has been found. The shape III develops high speeds at the same angles of attack and has higher manoeuvrability at relatively low aerodynamic quality. The comparative analysis of the flow capabilities of studied autonomous undersea vehicles proposes some design improvement for increasing their energy efficiency and flow stability.
Źródło:
Archive of Mechanical Engineering; 2019, LXVI, 2; 171-189
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CFD modeling of passive autocatalytic recombiners
Autorzy:
Orszulik, M.
Fic, A.
Bury, T.
Powiązania:
https://bibliotekanauki.pl/articles/147615.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
nuclear reactor
hydrogen
passive autocatalytic recombiners
CFD modeling
Opis:
This study deals with numerical modeling of passive autocatalytic hydrogen recombiners (PARs). Such devices are installed within containments of many nuclear reactors in order to remove hydrogen and convert it to steam. The main purpose of this work is to develop a numerical model of passive autocatalytic recombiner (PAR) using the commercial computational fluid dynamics (CFD) software ANSYS-FLUENT and tuning the model using experimental results. The REKO 3 experiment was used for this purpose. Experiment was made in the Institute for Safety Research and Reactor Technology in Julich (Germany). It has been performed for different hydrogen concentrations, different flow rates, the presence of steam, and different initial temperatures of the inlet mixture. The model of this experimental recombiner was elaborated within the framework of this work. The influence of mesh, gas thermal conductivity coefficient, mass diffusivity coefficients, and turbulence model was investigated. The best results with a good agreement with REKO 3 data were received for k-ε model of turbulence, gas thermal conductivity dependent on the temperature and mass diffusivity coefficients taken from CHEMKIN program. The validated model of the PAR was next implemented into simple two-dimensional simulations of hydrogen behavior within a subcompartment of a containment building.
Źródło:
Nukleonika; 2015, 60, 2; 347-353
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of a mixture flow of helium and methanol in thermocatalytic reactor and chemical reactions on the intermethallic phase of Ni3A
Autorzy:
Ziółkowski, P.
Stajnke, M.
Jóźwik, P.
Powiązania:
https://bibliotekanauki.pl/articles/175269.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CFD modeling
numerical analysis
methanol decomposition
catalytic reactions
Opis:
In this paper, the specified issues that occurs in the numerical modeling of complex phenomena of chemical reactions intensified with forced fluid flow in the thermocatalytic reactor channels on the intermetallic phase of Ni3Al are presented. Based on the example of flowing mixture containing helium contaminated by methanol in a horizontal microchannels, heated from the outside, received results of the experiment were shown and compared with computational fluid dynamize calculations. However, standard version of commercial code have been expanded by user definedfunctions. These extensionstransformed the calculation mechanisms and algorithms of computational fluid dynamize codes adapting them for the micro-flow cases and increased chemical reactions rate on an interphase between fluid and solid. Results obtained on the way of numerical calculations were compared with experimental data receiving satisfactory compliance.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2017, 138; 33-73
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
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