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Tytuł:
Analiza metod pomiaru rozkładu prędkości strumieni powietrza w kabinach lakierniczych
Analysis of measurement methods of air streams velocity distribution inside spray booths
Autorzy:
Nikończuk, P.
Królikowski, T.
Rypina, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/249882.pdf
Data publikacji:
2015
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
kabina lakiernicza
prędkość strumienia
strumień powietrza
model CFD
spray booth
stream of air
CFD model
Opis:
W artykule przedstawiono analizę metod pomiaru rozkładu prędkości strumieni powietrza w pomieszczeniach. Analiza koncentruje się na przykładzie kabin lakierniczych, ze względu na charakter procesu lakierniczego wymagana jest wymiana powietrza z utrzymaniem odpowiednich reżimów. Oprócz analizy istniejących metod przedstawiono koncepcyjną metodę pomiaru wykorzystującą obrazy termowizyjne. Wyniki pomiarów pozwalają również na weryfikację numerycznych modeli CFD obrazujących obieg powietrza w modelowanych pomieszczeniach.
The paper presents analysis of current measurement methods of air streams distribution inside closed spaces. Analysis is focused on measurement inside spray booths. In case of specific nature of finishing process the air exchange in workspace is obligatory. The quality of air exchange is regulated with many requirements including air balance. Measurement will also help to verify numerical CFD models of air streams distribution.
Źródło:
TTS Technika Transportu Szynowego; 2015, 12; 1108-1111, CD
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza sposobów modelowania reaktora trójfazowego ze stałym złożem (TBR) z użyciem metod CFD
Analysis of modelling of a three-phase fixed bed reactor using CFD procedures
Autorzy:
Janecki, D.
Bartelmus, G.
Powiązania:
https://bibliotekanauki.pl/articles/2073295.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
reaktor strużkowy
model CFD
hydrodynamika
przepływy wielofazowe
trickle-bed reactor
CFD model
hydrodynamics
multiphase flow
Opis:
Przedstawiono zagadnienia związane z zastosowaniem modelu wielofazowego Eulera do modelowania reaktora trójfazowego ze złożem stacjonarnym (TBR). Analizując równania modelu wyselekcjonowano parametry, które obliczane są w oparciu o dane dostępne w literaturze, a następnie przeprowadzono analizę czułości modelu na zmianę wartości wyselekcjonowanych parametrów. Przeanalizowano wpływ zmian zależności opisujących siły wzajemnych oddziaływań pomiędzy fazami oraz promieniowej zmiany porowatości wypełnienia na wyniki obliczeń numerycznych.
The paper presents issues connected with the use of Eulerian multiphase model for modelling a three-phase fixed-bed reactor (TBR). Param eters calculated on the basis of available in literature data were selected, and next the analysis of model sensitivity to the change of selected parameters was carried out. The influence of changes of relationships describing the interaction forces between phases and the change of radial porosity of packing on the results of numerical calculations was analyzed.
Źródło:
Inżynieria i Aparatura Chemiczna; 2018, 4; 95--96
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of influence of fuel spray angle on NOx fraction in the exhaust gas from marine 4-stroke diesel engine
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/246120.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine diesel engine
NOx fraction
spray angle
CFD model
Opis:
The manuscript presents the analysis of influence of fuel spray angle on NOx fraction in the exhaust gas emitted from marine 4-stroke diesel engine. Analysis is based on computational fluid dynamic (CFD) model designed because of the motion mesh of combustion chamber of the marine engine cylinder and air inlet and exhaust gas ducts. Presented model consists of models of fuel injection into combustion chamber, breaking-up and evaporation of the fuel, mixing with air and turbulent combustion with heat transfer to construction elements of the engine cylinder. Mentioned CFD model is validated according to boundary and initial conditions taken from direct measurements. The chosen research object is laboratory 4-stroke turbocharged Diesel engine with direct injection of the fuel and mechanically controlled of both cylinder valves and the injector. The conclusion from the analysis is that the increase of fuel spray angle causes the increase of maximum speed of kinetic phase of the combustion and the decrease of maximum speed of diffusion phase of the combustion. The effect of this is the increase of maximum combustion pressure and the decrease of maximum combustion temperature. The result of presented changes in combustion process is the increase of NOx fraction in the exhaust gas. It should be noted that extended increase of the fuel spray angle cause close-up the fuel spray to the cylinder heads wall and the decrease of NOx fraction in the exhaust gas.
Źródło:
Journal of KONES; 2015, 22, 3; 309-316
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laminar field optimization in connection with the current pandemic situation caused by COVID-19
Optymalizacja z wykorzystaniem pola laminarnego w odniesieniu do obecnej sytuacji pandemicznej spowodowanej przez COVID-19
Autorzy:
Hrnková, Bronislava
Hečko, Dávid
Kapjor, Andrej
Mičko, Pavol
Vantúch, Martin
Powiązania:
https://bibliotekanauki.pl/articles/2055095.pdf
Data publikacji:
2021
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
laminar field
clean room
air flow
CFD model
outlet
pole laminarne
czyste pomieszczenie
przepływ powietrza
model CFD
wywiew
Opis:
COVID-19 is constantly spreading around the world. Doctors, nurses and medical staff spend more time providing their professional help than usual. It is especially important to provide them with a suitable working environment. Therefore, in the following article we will deal with the design of a computational model of a laminar field in a clean room using CFD methods.
COVID-19 nieustannie rozprzestrzenia się w świecie. Lekarze, pielęgniarki i personel medyczny spędzają więcej czasu niż zwykle niosąc profesjonalną pomoc. Jest zatem szczególnie istotne, aby zapewnić im odpowiednie środowisko pracy. Dlatego też w prezentowanym artykule zajęto się zaprojektowaniem modelu komputerowego pola laminarnego w czystym pomieszczeniu z wykorzystaniem metod CFD.
Źródło:
Structure and Environment; 2021, 13, 1; 5--9
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jakościowa oraz ilościowa weryfikacja własnego algorytmu liczącego zapotrzebowanie mocy w modelu CFD dla procesu mieszania
Quantitative and qualitative verification of the own algorithm for mixing power computation using CFD method
Autorzy:
Staszak, M.
Wesołowski, P.
Alejski, K.
Powiązania:
https://bibliotekanauki.pl/articles/2071074.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mieszanie
model CFD
moc mieszania
turbina Rushtona
program ANSYS
mixing CFD model
mixing power consumption
Rushton turbine
ANSYS software
Opis:
W pracy przedstawiono wyniki matematycznego modelowania procesu mieszania w zbiorniku w skali technicznej wraz z eksperymentalną weryfikacją uzyskanych wyników. Klasyczny model matematyczny oparty o technikę CFD został wzbogacony o dodatkowy, własny algorytm liczenia mocy przekazywanej przez mieszadło do objętości płynu. Pomiary mocy mieszania wykonane zostały w zbiorniku o średnicy D = 0,575 m wyposażonym w cztery przegrody o szerokości B = O, 1D przy użyciu turbiny Rushtona. Obliczenia symulacyjne wykonano za pomocą oprogramowania Ansys i własnych procedur UDF.
The paper presents results of mathematical modeling of mixing process in a technical-scale tank together with the experimental validation. The classic mathematical CFD model was extended using the own algorithm for computation of bulk phase mixing power. The measurements of mixing power were performed in the tank of D = 0.575 m in diameter equipped with four baffles of B = 0. 1D width. The Ruathon turbine was used in the experiments. The calculations were performed using Ansys software with the own UDF functions. .
Źródło:
Inżynieria i Aparatura Chemiczna; 2010, 1; 103-104
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A CFD model of a two-phase mixture flow in a test stand for air-borne particle analysis
Autorzy:
Stachnik, M.
Czachor, G.
Jakubowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/297802.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
CFD model
Euler method
two-phase flow
aerosol
air-borne particles
Opis:
Farmers come across many materials which when being handled generate dust clouds. Even with low concentration these might pose risk of explosion and can carry dangerous microorganisms. To broaden the knowledge about fine dust particles sedimentation and analyze process of particles becoming air-borne, a tunnel air cleaner was designed. Based on the experiment, a CFX simulation was performed using the Eulerian approach and the CFX12.1 software. Presented model is a stedy state two-phase analysis of dust sedimentation. The results show mechanism of dust dispertion over large distance, such as regions of vorticity that seem to be main motor. Presented analysis emphasizes how easily small particles can become resuspended in the air and carried over distance. Acquired knowledge can be applied for safety regulation in many branches of agriculture.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2017, 20(4); 343-358
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The model of the air inlet duct flow of the marine 4-stroke diesel engine
Autorzy:
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/243843.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine diesel engine
Venturi orifice
air flow
CFD model
air duct throttling
Opis:
The manuscript presents the model of the air flow through the air inlet duct of the marine 4-stroke engine. Presented model are computational fluid dynamic modelbased on dimensions and the construction of the real air intake duct. The measurement parameters from real object are used to the model validation. Mentioned measurements of the air flow are conducted by Venturi orifice for different loads of the engine and the different flow characteristics of the air intake duct. The results from computational fluid dynamic model are useful to calibration the orifice by setting the orifice module. The orifice module changes up to 6% of the mean values for all considered loads of the engine and throttling’s of the air intake duct. The approximation the flow characteristic for other throttling’s of the air intake duct was conducted also. The obtained approximation is useful tool to calculate the air flow to the engine for the different throttling’s than measured. Linear dependence between the air mass flow and the power of the engine at the constant engine speed was observed. The throttling of the cross section area of the air intake duct causes changing the characteristic in accordance to a second order polynomial. The maximum error of obtained approximation compared to measured values not excided 4% and mean error for all measured loads and throttling’s not exceeded 0.12%.
Źródło:
Journal of KONES; 2013, 20, 2; 193-200
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The CFD analysis of influence the start of fuel injection (SOI) on combustion parameters and exhaust gas composition of the marine 4-stroke engine
Autorzy:
Kowalski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/133899.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
marine four-stroke engine
NOx emission
CFD model
combustion
SOI
start of injection angle
czterosuwowy silnik okrętowy
emisja NOx
model CFD
spalanie
kąt początku wtrysku
Opis:
The paper presents a theoretical analysis of the impact of injection timing on the parameters of the combustion process and the composition of exhaust gas from a 4-stroke engine designed to shipbuilding. The analysis was carried out based on a three-dimensional multi-zone model of the combustion process. This model has been prepared on the basis of properties of the research facility. The input data to the model were obtained through laboratory tests. Results of calculations showed that the change of the start of injection angle (SOI) from the value of 14 degrees before TDC to 22 degrees before TDC results in changes in the combustion rate and thus an increase in the temperature of the combustion process as well as the increase of nitric oxides fraction in the exhaust gas. Simultaneously the maximum combustion pressure increases also.
Źródło:
Combustion Engines; 2019, 58, 2; 40-45
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical analysis of underground coal gasification models. Part II: Kinetic and computational fluid dynamics models. Literary studies and comparison of models
Autorzy:
Żogała, A.
Powiązania:
https://bibliotekanauki.pl/articles/91950.pdf
Data publikacji:
2014
Wydawca:
Główny Instytut Górnictwa
Tematy:
coal gasification
kinetic models
CFD models
zgazowanie węgla
model kinetyczny
model CFD
Opis:
Purpose Underground coal gasification, as a complex and technically difficult process, in many aspects requires the support provided by computer simulations. There are a lot of mathematical models of UCG, some of them are concentrated with the forecast of syngas composition. The most important may be divided into three groups: equilibrium, kinetic and CFD models. The purpose of this work was the detailed critical analysis of more advanced approaches (than equilibrium considerations) applied in simulations of the coal conversion process – both kinetic and based on computational fluid dynamics. The other aim of this paper was the comparative analysis of the most important models of underground coal gasification. Methods Literary studies, concerned with the features and mathematical description of kinetic and CFD models of coal gasification, were used as the research method applied in the work presented. Compilation of the kinetic parameters of gasification reactions was an important part of this article. For that purpose the analysis of Polish and foreign papers, monographs and university handbooks was undertaken. Results Critical analysis of kinetic and CFD models of coal gasification (together with their mathematical formulation) was the result of considerations presented in this article. Kinetic equations were shown separately for pyrolysis, homogenous and heterogeneous reactions. In the case of CDF models, except for the presentation of the conservation equation, the most important methods of modeling turbulence are described (for the reason that this phenomenon may have significant inflence on the final results). Practical implications The work presented describes practical issues connected with kinetic and CFD models, focusing on their capabilities, drawbacks and possible application problems. Originality/ value This paper presents state of art in the field of coal gasification modeling using kinetic and computational fluid dynamics approach. The paper also presents own comparative analysis (concerned with mathematical formulation, input data and parameters, basic assumptions, obtained results etc.) of the most important models of underground coal gasification.
Źródło:
Journal of Sustainable Mining; 2014, 13, 1; 29-37
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High quality multi-zone and 3d CFD model of combustion in marine diesel engine cylinder
Autorzy:
Cuper-Przybylska, Dominika
Nguyen, Van Nhanh
Cao, Dao Nam
Kowalski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/32921247.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
CFD combustion model
large 4-stroke engine
diesel engine
emission
NOx concentration
Opis:
The paper presents a 3D model of the processes taking place in the cylinder of a large 4-stroke marine engine. The model is based on CFD calculations performed on the moving mesh. The modelling range includes the full duty cycle (720° crankshaft position) and the complete geometry of the cylinder with inlet and exhaust ducts. The input data, boundary conditions and validation data were obtained by direct measurements on the real object. Fuel injection characteristics were obtained by Mie scattering measurements in a fixed-volume chamber. The modelling results have been validated in terms of the pressure characteristics of the engine’s cylinder within the entire range of its loads. The mean error did not exceed 1.42% for the maximum combustion pressure and 1.13% for the MIP (Mean Indicated Pressure). The model was also positively validated in terms of the O2 and NOx content of the exhaust gas. The mean error in this case was 1.2% for NOx fractions in the exhaust gas and 0.4% for O2 fractions. The complete model data has been made available in the research data repository on an open access basis.
Źródło:
Polish Maritime Research; 2023, 2; 61-67
1233-2585
Pojawia się w:
Polish Maritime Research
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:
Windshield Defrost Simplified CFD Model
Autorzy:
Schmid, Michal
Powiązania:
https://bibliotekanauki.pl/articles/112070.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
windshield defrost
CFD
ice layer thickness
VOF
Thin Film
model CFD
model VOF
cienki film
Opis:
The windshield defrost system, in general, is a vehicle safety feature. Thus, its restricted by variety of directives. However, the OMEs’ benchmark targets could be even more demanding as the deicing process is in addition also part of passengers comfort. From vehicle design point of view the wind-shield defrost system is typically connected to HVAC unit (Heating, Ventilation and Air Conditioning). In the technical solution the windshield is heated via hot air convection. Nevertheless, other methods are becoming more and more popular, like directly heated glass by hot wire ohmic heating (heated glasses). The defrost CFD model should predict the ice layer thickness in time and space and in environmental conditions defined according to appropriate directives and technical solution. The accurate and fast modelling technique is essential part of a vehicle development, especially nowadays, where the optimization techniques area widely used and requires hundreds of simulations runs. Modelling requests are even increasing with modern pure electric vehicles (EVs), were the thermal and energy management is more demanding compared to the classical internal combustion engine (ICE) vehicles. The aim of the work is to verify possibility to model the ice layer thickness with simplified approach, which could be beneficial from computational time burden.
Źródło:
Production Engineering Archives; 2019, 25; 8-11
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling and simulation tests of a quadrocopter flying robot
Autorzy:
Ciesielka, Wojciech
Grzegorz, Suchanek
Powiązania:
https://bibliotekanauki.pl/articles/2064410.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
quadrocopter
mathematical model
CFD simulation
model matematyczny
symulacja CFD
Opis:
In recent years, there has been a dynamic increase in the use of multirotor flying robots in various areas of economic and social life. Robots of this kind may be used in environmental research, after equipping them with an appropriate measuring systems. This includes taking measurements of various types of contaminants, such as: particulate matter (PM), various gases, noise and light pollution. To make this possible, it is necessary to conduct advanced model-simulation tests of the flying platform, analyse and determine the appropriate location for the measurement system. Most of the current research on methods and techniques of taking measurements on the flying platform does not take into account these issues. This work consists of two main parts: modeling and simulation tests, and experimental part carried out in laboratory conditions. As part of the work, quadrocopter dynamics equations have been developed and implemented in the Matlab/Simulink environment. The developed discrete mathematical model made it possible to simulate different robot maneuvers: upward, forward, sideways and rotation flight. In order to determine the required characteristics of the multicopter drive sets, a mobile dynamometer station was designed, constructed and programmed. The dynamometer allows, among others, to take measurements of thrust force, torque and rotational speed. The final stage of the work was the development of the numerical model and CFD calculations of the quadrocopter. In this part, distributions of the pressure fields and velocity for the robot's hover state were determined.
Źródło:
New Trends in Production Engineering; 2019, 2, 1; 486--495
2545-2843
Pojawia się w:
New Trends in Production Engineering
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:
A multiscale methodology for CFD simulation of catalytic distillation bale packings
Autorzy:
Ding, H.
Xiang, W.
Liu, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/780059.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
multiscale model
CFD
reactive distillation
Opis:
A multiscale model for simulating the hydrodynamic behavior of catalytic bale packings has been proposed. This model combines computational fluid dynamics (CFD) and macroscopic calculation. At small scale calculation, the CFD model includes 3-D volume-of-fluid (VOF) simulation within representative elementary unit (REU) under unsteady-state conditions. The REU constitutes gauze and catalyst domain, and porous media model is applied. At large scale calculation, a new mechanistic model deduced from the unit network model is employed. Based on liquid split proportion from small scale calculation, liquid distribution of the entire bale packing can be predicted. To evaluate different packing design, three common bale arrangements, i.e. one-bale, nine-bales and seven-bales, are compared. The area-weighted Christiansen uniformity coefficient is introduced to assess the distribution performance. A comparison between simulation and experimental results is made to validate the multiscale model. The present methodology is proved to be effective to analysis and design of catalytic distillation columns.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 1; 24-32
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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