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Wyświetlanie 1-15 z 38
Tytuł:
Study of combustion process with jet-ignition of propane-air mixtures
Autorzy:
Sendyka, B.
Mitianiec, W.
Noga, M.
Powiązania:
https://bibliotekanauki.pl/articles/200972.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gaseous mixture
combustion
jet ignition
mieszanina gazowa
spalanie
zapłon jet
Opis:
The paper presents the study of combustion process of a homogenous lean propane-air mixture in the cylindrical combustion chamber ignited by a hot gas jet from the pre-ignition chamber. A rich propane-air mixture in the pre-chamber is ignited by the spark plug and the exhaust gasses flow from the chamber trough the holes in the wall. The mathematical model of gas exchange and energy balance in chambers with a laminar finite-rate model taking into account the two-step Arrhenius chemical kinetics is presented. The work presents results of thermodynamic parameters of the charge obtained in CFD simulations in Fluent and Kiva3v for three configurations: with one hole in the wall of the ignition chamber, with three holes and without an ignition chamber. Modelling and simulation have shown faster burning of the mixture for jet ignition with three holes of the pre-chamber. The results of simulations were verified by experimental studies in the combustion chamber of the same geometry by the Schlieren method. The work presents flame front propagation, pressure traces and pressure increment speed for two mixtures with a different equivalence fuel-air ratio. Experimental results proved the simulation observation of faster flame propagation in the main chamber with three holes.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 533-543
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cold Zone Exploration Using Position of Maximum Nusselt Number for Inclined Air Jet Cooling
Autorzy:
Ingole, S. B.
Sundaram, K. K.
Powiązania:
https://bibliotekanauki.pl/articles/139691.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
jet impingement
inclined jet
cold zone
air jet cooling
uderzenie strumienia
strumień nachylony
strefa zimna
chłodzenie strumieniem powietrza
Opis:
Inclined jet air cooling can be effectively used for cooling of electronics or other such applications. The non-confined air jet is impinged and experimentally investigated on the hot target surface to be cooled, which is placed horizontally. Analysis and evaluations are made by introduction of a jet on the leading edge and investigated for downhill side cooling to identify cold spots. The jet Reynolds number in the range of 2000 ≤ Re ≤ 20 000 is examined with a circular jet for inclination (θ) of 15 less than θ less than 75 degree. Also, the consequence of a jet to target distance (H) is explored in the range 0.5 ≤ H/D ≤ 6.8. For 45 degree jet impingement, the maximum Nusselt number is widely spread. Location of maximum Nusselt number is studied, which indicates cold spots identification. At a higher angle ratio, the angle is the dominating parameter compared to the Reynolds Number. Whereas at a lower angle ratio, the inclined jet with a higher Reynolds number is giving the cooling point away from leading edge. It is observed that for a particular angle of incident location of maximum Nusselt Number, measured from leading edge of target, is ahead than that of stagnation point in stated conditions.
Źródło:
Archive of Mechanical Engineering; 2017, LXIV, 4; 533-549
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Alloy Steel Structures After Welding with Micro-Jet Cooling
Autorzy:
Węgrzyn, T.
Piwnik, J.
Hadryś, D.
Wszołek, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/356533.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
welding
micro-jet
impact toughness
steel
Opis:
The paper focuses on low alloy steel after innovate welding method with micro-jet cooling. Weld metal deposit (WMD) was carried out for welding and for MIG and MAG welding with micro-jet cooling. This method is very promising mainly due to the high amount of AF (acicular ferrite) and low amount of MAC (self-tempered martensite, retained austenite, carbide) phases in WMD. That structure corresponds with very good mechanical properties, ie. high impact toughness of welds at low temperature. Micro-jet cooling after welding can find serious application in automotive industry very soon. Until that moment only argon, helium and nitrogen were tested as micro-jet gases. In that paper first time various gas mixtures (gas mixtures Ar-CO2) were tested for micro-jet cooling after welding.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 115-118
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling the effects of failure of pipelines transporting hydrogen
Autorzy:
Rusin, A.
Stolecka, K.
Powiązania:
https://bibliotekanauki.pl/articles/185483.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wodór
wybuch
hydrogen pipeline
jet fire
explosion
Opis:
The depletion of stocks of fossil fuels and the environment protection requirements increase the significance of hydrogen as a future energy carrier. The present research is focused on the development of new safe methods of production, transport and storage of hydrogen. The paper presents an analysis of problems related to the assessment of the effects of failure of hydrogen transporting pipelines. Scenarios of hazardous events connected with an uncontrollable leakage of hydrogen are discussed. The sizes of heat radiation and pressure wave hazard zones are determined.
Źródło:
Chemical and Process Engineering; 2011, 32, 2; 117-134
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gas Mixtures for Welding with Micro-Jet Cooling
Gazowe mieszanki do spawania z chłodzeniem mikro-jetowym
Autorzy:
Węgrzyn, T.
Powiązania:
https://bibliotekanauki.pl/articles/352813.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
welding
micro-jet cooling
weld
metallographic structure
gas mixtures
spawanie
chłodzenie mikro-jet
spoina
struktura metalograficzna
mieszanka gazowa
Opis:
Welding with micro-jet cooling after was tested only for MIG and MAG processes. For micro-jet gases was tested only argon, helium and nitrogen. A paper presents a piece of information about gas mixtures for micro-jet cooling after in welding. There are put down information about gas mixtures that could be chosen both for MAG welding and for micro-jet process. There were given main information about influence of various micro-jet gas mixtures on metallographic structure of steel welds. Mechanical properties of weld was presented in terms of various gas mixtures selection for micro-jet cooling.
Chłodzenie mikro-jetowe było stosowane tylko w spawalniczym procesie MIG i MAG, gdzie gazem osłonowym były tylko argon, hel i azot. W artykule przedstawiono informacje na temat wykorzystania mieszanek gazowych do chłodzenia mikro-jetowego. Podano informacje zarówno dla gazów, które mogą być wybrane dla spawania MAG i dla mikro-jetowego procesu. Uzyskano informacje o wpływie doboru mieszanek gazowych do chłodzenia mikro-jetowego na strukturę metalograficzną stalowych spoin. Własności mechaniczne złącza podano dla złączy wykonanych różnymi mieszankami gazowymi.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 1; 107-110
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CFD analysis of mixing intensity in jet stirred reactors
Autorzy:
Gil, I.
Mocek, P.
Powiązania:
https://bibliotekanauki.pl/articles/185797.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
kinetyka
CFD
jet stirred reactor
kinetic
reaction design
Opis:
The homogeneous stirred reactor designed for kinetic studies of the combustion of hydrocarbons with intensive internal recirculation in high temperature combustion chamber is described. The originality of our reactor lies in its construction which allows to intensively mix fuel and flue gases, measure gas temperature as well as obtain samples which can be used to investigate diffusion flames. The cylindrical construction enables to use the reactor in laboratory cylindrical electrically heated ovens. The CFD analysis of the reactors, the mixing parameters (turbulent Peclet number and mixing level) and the volume average temperature in the reactors were elaborated on the basis of the typical dimensions of classical reactors to kinetics research as well as the own reactor design. The results of the analysis allow to reveal advantages of our construction.
Źródło:
Chemical and Process Engineering; 2012, 33, 3; 397-410
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On proper closures for modeling of turbulent combustion
Autorzy:
Zakrzewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/175142.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
two-equation turbulence
jet flows
Pope correction
combustion
Opis:
The subject of this work is the numerical simulation of a turbulent diffusion jet flame fueled with a mixture of CH4, H2, and N2. Simulations have been investigated with various two-equation turbulence models to improve prediction of jet flow fields. The calculations are validated against existing experimental data obtained by Raman and laser Doppler velocimetry. In particular, a comparison of three two-equation turbulence models and their influence on combustion proces is presented, namely the Pope corrected k-ε model, standard k-ε model and the realizable k-ε. For combustion modeling the eddy dissipation concept (EDC) model with a 25-step reaction is considered. The numerical results for mean velocity components, temperature, and major chemical species are presented and compared with the experimental data. The goal of the work is to investigate the capabilities of the used turbulence models in proper predicting of the round jet spreading in a nonpremixed jet flame. Simple geometry allows for reliable flow simulations. Calculations were performed using FLUENT 2D and 3D solver. The Pope correction has been applied via the user defined function. The advantages and disadvantages of the models are discussed in detail in the meantime during presentation of the results.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 81-91
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathemathical Equations of the Influence of Molybdenum and Nitrogen in Welds
Autorzy:
Węgrzyn, T.
Kamińska, J.
Piwnik, J.
Stanik, Z.
Powiązania:
https://bibliotekanauki.pl/articles/352317.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
welding
steel
micro-jet
ferrite
impact toughness
equations
Opis:
The paper offers mathematical equations of the influence of micro-jet cooling on structure and impact toughness properties of metal weld deposit. Weld metal deposit (WMD) was carried out for standard MIG welding and for MIG welding with micro-jet cooling. This new method is very promising mainly due to the high amount of AF (acicular ferrite) and low amount of MAC (selftempered martensite, retained austenite, carbide) phases in WMD. That structure corresponds with very good mechanical properties ie. good impact toughness of welds at low temperature. Micro-jet cooling after welding can find serious application in automotive industry very soon. Until that moment only argon, helium, nitrogen and gas mixtures of argon were tested for micro-jet cooling after welding. The best results of mechanical properties of WMD in presented welding method correspond with micro-jet argon cooling.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 83-86
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Properties of Plug Welds after Micro-Jet Cooling
Autorzy:
Hadryś, D.
Powiązania:
https://bibliotekanauki.pl/articles/353030.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
welding
micro-jet cooling
plug welds
plastic properties
Opis:
New technology of micro-jet welding could be regarded as a new way to improve mechanical properties of plug welds. The main purpose of that paper was analyzing of mechanical properties of plug welds made by MIG welding method with micro-jet cooling. The main way for it was comparison of plug welds made by MIG welding method with micro-jet cooling and plug welds made by ordinary MIG welding method. It is interesting for steel because higher amount of acicular ferrite (AF) in weld metal deposit (WMD) is obtained in MIG welding method with micro-jet cooling in relation to ordinary MIG welding method. This article presents the influence of the cooling medium and the number of micro-jet streams on mechanical properties of the welded joint. Mechanical properties were described by force which is necessary to destroy weld joint.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1771-1776
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Roughness Parameters Calculation By Means Of On-Line Vibration Monitoring Emerging From AWJ Interaction With Material
Autorzy:
Hreha, P.
Radvanska, A.
Knapcikova, L.
Królczyk, G. M.
Legutko, S.
Królczyk, J. B.
Hloch, S.
Monka, P.
Powiązania:
https://bibliotekanauki.pl/articles/221321.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
abrasive water jet
surface topography
material vibration
vibration measurement
Opis:
The paper deals with a study of relations between the measured Ra, Rq, Rz surface roughness parameters, the traverse speed of cutting head v and the vibration parameters, PtP, RMS, vRa, generated during abrasive water jet cutting of the AISI 309 stainless steel. Equations for prediction of the surface roughness parameters were derived according to the vibration parameter and the traverse speed of cutting head. Accuracy of the equations is described according to the Euclidean distances. The results are suitable for an on-line control model simulating abrasive water jet cutting and machining using an accompanying physical phenomenon for the process control which eliminates intervention of the operator.
Źródło:
Metrology and Measurement Systems; 2015, 22, 2; 315-326
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Large Eddy Simulations and κ-ε Modelling of Fluid Velocity and Tracer Concentration in Impinging Jet Mixers
Autorzy:
Wojtas, K.
Orciuch, W.
Makowski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/185361.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
jet mixer
mixing
PIV
PLIF
LES
mieszalnik strumieniowy
mieszanie
Opis:
Simulations of turbulent mixing in two types of jet mixers were carried out using two CFD models, large eddy simulation and k-ε model. Modelling approaches were compared with experimental data obtained by the application of particle image velocimetry and planar laser-induced fluorescence methods. Measured local microstructures of fluid velocity and inert tracer concentration can be used for direct validation of numerical simulations. Presented results show that for higher tested values of jet Reynolds number both models are in good agreement with the experiments. Differences between models were observed for lower Reynolds numbers when the effects of large scale inhomogeneity are important.
Źródło:
Chemical and Process Engineering; 2015, 36, 2; 251-262
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of the prototype of a Roto-Jet pump for the domestic ORC power plant
Autorzy:
Kaczmarczyk, Tomasz Z.
Ihnatowicz, Eugeniusz
Żywica, Grzegorz
Kaniecki, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/240196.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Roto-Jet pump
pitot tube pump
domestic ORC micropower plant
low-boiling medium
pompa
Roto-Jet
pompa czerpakowa
mikropompa
ORC
czynnik niskowrzący
Opis:
The purpose of the work was to experimentally determine the characteristics of the prototype of a Roto-Jet pump (the Pitot tube pump) during its operation under conditions typical for the domestic micro power plant. The low-boiling fluid, sold under the trade name of HFE7100 and characterised by a zero ozone depletion potential (ODP) coefficient, was used as a working medium in the organic Rankine cycle (ORC). An electric thermal oil heater with a maximum power of 2×24 kWe was used as a heat source. The pump of Roto-Jet type was specially designed for the operation with the following rated parameters of the thermodynamic cycle: nominal flow rate of the working fluid 0.17 kg/s, operating pressure 1.2 MPa. The pump was put under load using an expansion valve that simulated the operation of an expansion machine. The article discusses thermodynamic and flow conditions to be met by the pumping engine as well as results of the experimental research. Moreover, the article includes the operational characteristics of the ORC installation and the Roto-Jet pump obtained during the operation with the target working medium – HFE7100. The engineering problems the authors of this article faced when designing and testing the pumping engine prototype are also presented.
Źródło:
Archives of Thermodynamics; 2019, 40, 3; 83-108
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compressive Strength of Steel Frames after Welding with Micro-Jet Cooling
Autorzy:
Hadryś, D.
Węgrzyn, T.
Piwnik, J.
Wszołek, Ł.
Węgrzyn, D.
Powiązania:
https://bibliotekanauki.pl/articles/351848.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
welding
micro-jet cooling
plastic properties
compressive tests
impact toughness
Opis:
Low carbon steel weld structures generally exhibit a very linear stress-strain relationship. In the study of strength of materials, the compressive strength is the capacity of a material or structure to withstand loads tending to reduce size of structure. It is mainly measured by plotting applied force against deformation in a testing machine. Compressive strength is a main key value for design of welded structures.The main goal of that paper was analysing of plastic properties of frame welds which were made with various parameters of micro-jet cooling. New technology of micro-jet welding could be regarded as a new way to improve plastic properties of welds. It allows to obtain welds with better mechanical properties in comparison to ordinary welding method. Furthermore it is possible to steering of weld structure and properties of the weld. There were given main information about influence of various micro-jet gases on metallographic and properties of structure steel welds.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 123-126
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact Toughness of Steel WMD after TIG Welding
Autorzy:
Węgrzyn, T.
Piwnik, J.
Stanik, Z.
Węgrzyn, D.
Sieteski, D.
Powiązania:
https://bibliotekanauki.pl/articles/355102.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
TIG
welding
micro-jet
oxygen in WMD
acicular ferrite
impact toughness
Opis:
The material selected for this investigation was low alloy weld metal deposit after TIG welding with various amount of oxygen in weld metal deposit (WMD). After TIG process it is difficult to get proper amount of oxygen in WMD on the level much lower than 350 ppm. The highest impact toughness of low alloy WMD corresponds with the amount of oxygen in WMD above 350 ppm. In the paper focuses on low alloy steel after innovate welding method with micro-jet cooling that could be treated as a chance on rising amount of oxygen in weld. Weld metal deposit (WMD) was carried out for TIG welding with micro-jet cooling with various amount of oxygen in WMD. In that paper various gas mixtures (gas mixtures Ar-O2 and Ar-CO2) were tested for micro-jet cooling after TIG welding. An important role in the interpretation of the results can give methods of artificial intelligence.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1647-1650
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application research of high pressure jet grouting pile in an underground engineering in Vietnam
Autorzy:
Nguyen, Xuan Loi
Wu, Li
Nguyen, Khanh Tung
Bui, Quang Anh
Powiązania:
https://bibliotekanauki.pl/articles/231234.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ciśnienie wysokie
pal jet grouting
podstawa pala
odkształcenie
fundament
kontrola przesączania
efekt wzmocnienia
high pressure
jet grouting pile
pile principle
deformation
foundation
seepage control
reinforcement effect
Opis:
High-pressure jet grouting pile is a kind of stratum reinforcement technology developed in recent years. Due to its characteristics of high solid strength, fast construction, low noise, safety and reliability, low cost, controllable reinforcement diameter, strong adaptability to stratum, and good reinforcement effect for soft soil, loose soil and water-rich stratum, high-pressure jet grouting pile technology has been more and more widely used in foundation treatment, water stop, and seepage prevention, tunnel lining and other fields in recent years. As a country with a relatively late development of underground construction engineering, Vietnam has little research on special geotechnical reinforcement technology, especially on special geotechnical reinforcement technology around urban underground construction engineering, especially on its theoretical analysis and practical application. Therefore, this thesis combines the Vietnam Trung Hoa tunnel project as an example, using the theoretical calculation formula and field monitoring measurement comparing the two methods, the high pressure jet grouting pile system research in Vietnam in the underground engineering reinforcement principle and application effect, get to the actual engineering design and construction has a guiding significance to the research, provides the reference for future similar projects. Finally, the application effect of high-pressure jet grouting pile in underground building reinforcement project is evaluated, which proves that high-pressure jet grouting pile has good applicability and economic benefit in underground building reinforcement project in Vietnam.
Źródło:
Archives of Civil Engineering; 2020, 66, 3; 575-593
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 38

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