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Wyświetlanie 1-12 z 12
Tytuł:
Mechanical and thermal stresses issues related to a size of a four-stroke piston based on a Renault Premium DXi11 430 460 EEV engine
Autorzy:
Kaliszewski, M.
Mazuro, P.
Powiązania:
https://bibliotekanauki.pl/articles/242061.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
heat transfer
temperature distribution
four-stroke engine piston
finite element method
size related issues
Opis:
The size of an engine is one of the factors affecting its thermal efficiency. It is known that with an increase of the size of the engine, the cubic capacity and heat generation grows in the third power, whereas thermal losses are proportional only to the second power of the size (due to heat exchange surface). However, the increase in the size of the engine generates some problems related to its mass, rotational speed and heat load, the last of which is a subject of these considerations. In the article, the influence of the piston size on its thermal and mechanical stresses is considered. Similar boundary conditions for both cases were assumed. Simulation of the steady-state heat transfer and mechanical simulation were carried out using the Finite Element Method. In each analysis, both the original version of the piston and its scaled version were considered. The boundary conditions were adopted on the basis of engine catalogue data and available literature. The results of analyses were discussed.
Źródło:
Journal of KONES; 2018, 25, 3; 275-282
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of thermal and mechanical stresses of Renault Premium DXi11 460 EEV four-stroke piston
Autorzy:
Kaliszewski, M.
Mazuro, P.
Powiązania:
https://bibliotekanauki.pl/articles/245402.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
heat transfer
temperature distribution
four-stroke engine piston
finite element method
1D combustion
Opis:
In this article the engine piston Renault Premium DXi11 430 460 EEV has been analysed using the Finite Element Method. Analysis consider as well heat transfer phenomenon as the thermal and mechanical strains of the piston. Simulations were performed for the point of engine maximum power. Piston material was assumed to be 40HM (1.7225) steel and its properties are delivered basing on available scientific papers. The simulation assumed mean values of heat transfer coefficient, reference temperature and cycle pressure based on engine data, maximum power engine work simulation in AVL Boost software and literature. Part of boundary condition (e.g. cylinder wall temperature) was assumed basing on authors’ engineering intuition and experience. The resulting temperature distribution in the piston was implemented for geometrically nonlinear mechanical FEM analysis. Both the analysis of thermal stresses and stresses of the hot piston in the top dead centre were performed.
Źródło:
Journal of KONES; 2018, 25, 2; 169-175
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alternative FEM algorithm of determining piston ring pressure distribution on a cylinder to a contact simulation
Autorzy:
Kaliszewski, M.
Mazuro, P.
Powiązania:
https://bibliotekanauki.pl/articles/793393.pdf
Data publikacji:
2016
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
finite element modelling
algorithm
piston ring
pressure distribution
contact simulation
ANSYS programme
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2016, 16, 4
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozwinięcie metody analizy numerycznej wymiany ładunku w silnikach o tłokach przeciwbieżnych
Development of the numerical scavenging process analysis in opposed-piston engines
Autorzy:
Kalke, J.
Mazuro, P.
Sulikowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/133702.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
wymiana ładunku
silnik o tłokach przeciwbieżnych
skryptowanie
sprawność
scavenging
opposed-piston engine
scripting
efficiency
Opis:
Moc i sprawność całkowita silników dwusuwowych jest silnie zależna od sprawności wymiany ładunku, dlatego też optymalizacja tego procesu jest krytyczna z punktu widzenia wydajności. Głównym celem tego artykułu jest pokazanie potencjału łączenia ze sobą różnych narzędzi inżynierskich w celu znacznego przyspieszenia fazy koncepcyjnej weryfikacji różnych systemów wymiany ładunku. Proponowany algorytm postępowania używa różnorakich języków programowania do łączenia komercyjnych (w tym przypadku Ansys Workbench, Siemens NX, MathWorks Matlab, Microsoft Excel) i niekomercyjnych pakietów (Cantera) by uzyskać najważniejsze informacje tak wcześnie jak jest to możliwe. Proponowane narzędzie obsługuje model 0-wymiarowy procesu spalania (z zadanym stężeniem gazów wylotowych), podziału geometrii i dyskretyzacji przestrzennej, zautomatyzowanego ustawiania programu obliczeniowego i postprocesora do danych numerycznych, przygotowanych specjalnie dla rozrządu sterowanego tłokami. Przeprowadzono prostą ocenę zaoszczędzonego czasu dzięki zaproponowanej metodzie postępowania. Ostania część jest krytycznym podsumowaniem zaproponowanej metody i wskazuje pewne ciekawe kierunki rozwoju takie jak kosymulacja z programami 1D oraz bardziej zaawansowane modelowanie spalania.
The power and overall efficiency of two-stroke engines are strongly dependent by scavenging efficiency, thus optimization of this process is vital to performance. Main aim of this article is to show the potential of combining different engineering tools to substantially speed-up the conception verification phase of various scavenging systems. The suggested algorithm uses a variety of programming languages to interconnect commercial (in this case Ansys Workbench, Siemens NX, MathWorks Matlab, Microsoft Excel) and non-commercial packages (Cantera) to get the most important information as soon as possible. Presented tools cover 0-D combustion process model (with desired exhaust gases concentration), geometry division and meshing, automated solver-setting and numerical-data postprocessor, prepared especially for piston ported valves. A simple evaluation of time savings by using proposed method was conducted. Last part is a critical sum-up of presented method and pointing out some interesting directions of development, concerning co-simulation with 1D software and more sophisticated combustion modeling.
Źródło:
Combustion Engines; 2015, 54, 3; 511-519
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic analysis of combustion events in the natural gas fuelled SI engine with VVT
Autorzy:
Szwaja, M.
Mazuro, P.
Szwaja, S.
Powiązania:
https://bibliotekanauki.pl/articles/242837.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
internal combustion engine
variable valve timing
heat release rate
IMEP
combustion phases
Opis:
The main aim of the research was to investigate influence of overlap of the natural gas fuelled spark ignited engine on the following parameters: Indicated Mean Effective Pressure (IMEP), heat rate release including combustion phases (ignition lag, main combustion phase). The content of the study includes results from processing in-cylinder pressure measurements, heat release rate analysis, combustion phases, and finally the conclusions. The tests were carried out on the test bed including the single cylinder research engine with a displacement volume of 550 cm3. The engine was equipped with independent cam phasors for both intake and exhaust valves, but for this investigation, the exhaust valve timing was fixed (the exhaust cam centre line was fixed at -95 crank angle (CA) deg before Top Dead Centre) and intake valve timing was changed (the intake cam centre line was varied from 90 to 150 CA deg after Top Dead Centre). The overlap was changed in the range from 85 to 25 CA deg. 8 tests series were performed, each singular series consisted of 300 consecutive engine combustion cycles. As observed, by varying the valve overlap it contributes to significant change in the peak combustion pressure, peak of heat release rate, and combustion phases. Summing up, variable valve timing affects compression and expansion strokes by changing polytropic indexes due to various amounts of exhaust residuals trapped in the cylinder. It affects not only engine volumetric efficiency but also the heat release rate and IMEP, so it does engine performance. Thus, variable valve timing can be considered as valuable tool that can be applied to the natural gas fuelled internal combustion engine.
Źródło:
Journal of KONES; 2018, 25, 4; 421-427
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obliczenia numeryczne wymiany ładunku w silniku dwusuwowym z przeciwbieżnym układem tłoków
Scavenging process CFD computations in a two stroke opposed-piston engine
Autorzy:
Szczeciński, M.
Mazuro, P.
Skrobek, W.
Powiązania:
https://bibliotekanauki.pl/articles/132970.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
wymiana ładunku w cylindrze
silnik z przeciwbieżnym układem tłoków
cylinder scavenging
opposed-piston engine
Opis:
Dwusuwowe silniki tłokowe z przeciwbieżnym układem tłoków coraz częściej budzą zainteresowanie ośrodków badawczych na całym świecie. Konstrukcje te mają długą historię, a renesans zainteresowania związany jest z szeroką gamą zalet, które oferują. Jedną z nich jest wzdłużny system płukania cylindra. W artykule przed-stawiono proces modelowania wymiany ładunku jako część projektu układu rozrządu badawczego silnika z przeciwbieżnym układem tłoków. Omówiono parametry, których zmiana pozwala kontrolować zastosowane kryteria jakości płukania. Przedstawiono wyniki symulacji numerycznych oraz podkreślono główne wyzwania czekające na konstruktorów projektujących układ rozrządu w podobnej konstrukcji.
Two stroke opposed piston engines increasingly attract an interest among the research centers around the world. This engine architecture has a long story and renaissance of its interest is associated with a wide gamut of benefits they offer. The uniflow cylinder scavenging is definitely one of them. This paper presents a modeling process of the in-cylinder gas exchange as a part of the research engine timing system design. In addition, it highlights dependencies between the timing system design parameters and the scavenging quality factors. Final-ly, the article demonstrates numerical simulation results and takes into consideration main challenges in the piston ported timing system designing.
Źródło:
Combustion Engines; 2015, 54, 3; 563-569
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unsteady conjugated heat transfer in cylinder of highly loaded opposed-piston engine
Nieustalona sprzężona wymiana ciepła w cylindrze wysoko obciążonego silnika o tłokach przeciwbieżnych
Autorzy:
Kalke, J.
Szczeciński, M.
Mazuro, P.
Powiązania:
https://bibliotekanauki.pl/articles/132858.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
internal combustion engines
conjugated heat transfer
Ansys Fluent
MathWorks Matlab
scripting
silniki spalinowe
sprzężona wymiana ciepła
ANSYS Fluent
skryptowanie
Opis:
Paper presents a method of calculating the temperature distribution in cylinder for a 2-stroke, opposed-piston (OP) internal combustion engine (ICE). Development of such machines has been very limited after World War II due to technological and ecological problems [9], therefore progress in numerical modeling for analyzing highly boosted OP engines was also halted. Current technology permits returning to the OP arrangement, where due to better combustion chamber shape it is potentially possible to achieve higher thermodynamic efficiency than in arrangement with the cylinder head [9, 10]. Authors decided to use a general purpose CFD-program (in this case Ansys Fluent) coupled with additional tools to calculate conjugated heat transfer between the load in the cylinder and the cylinder itself to get a 3D temperature distribution in solid body.
Artykuł prezentuje metodę wyznaczania temperatury cylindra dla dwusuwowego silnika wewnętrznego spalania o tłokach przeciwbieżnych (opposed piston – OP). Rozwój takich maszyn po II wojnie światowej został mocno ograniczony z powodu problemów technologicznych i ekologicznych [9] i w związku z tym rozwój modelowania numerycznego, w celu analizy wysoko doładowanych silników typu OP, również został zahamowany. Obecny rozwój techniki pozwala powrócić do konstrukcji typu OP, w których z racji korzystniejszego kształtu komory spalania możliwe jest uzyskanie potencjalnie większej sprawności termodynamicznej niż w układzie z głowicą [9, 10]. Do obliczenia wymiany ciepła między ładunkiem w cylindrze a cylindrem, by otrzymać trójwymiarowy rozkład temperatury w ciele stałym, wykorzystano programu CFD ogólnego zastosowania (w tym przypadku Ansys Fluent) sprzężony z dodatkowymi narzędziami.
Źródło:
Combustion Engines; 2016, 55, 4; 64-72
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental test stand for development of an opposed-piston engine and initial results
Autorzy:
Kalke, J.
Opaliński, M.
Mazuro, P.
Powiązania:
https://bibliotekanauki.pl/articles/133676.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
opposed-piston
combustion
heat release
2-stroke
tłok przeciwbieżny
spalanie
wywiązywanie ciepła
suw
Opis:
The article presents the reason for developing a 0D predictive and diagnostic model for opposed-piston (OP) engines. Firstly, a description of OP engines, together with their most important advantages and challenges are given together with current research work. Secondly, a PAMAR-4 engine characteristic is presented. After that the proposed 0D predictive model is described and compared with the commercially availible software. Test stand with most important sensors and solutions are presented. After that the custom Engine Control Unit software is characterized together with a 0D diagnostic model. Next part discusses specific challenges that still have to be solved. After that the preliminary test bed results are presented and compared to the 0D simulations. Finally, the summary together with possible future improvement of both 0D predictive model and test bed capabilities are given.
Źródło:
Combustion Engines; 2017, 56, 2; 76-82
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation into the effect of bore/stroke ratio on a single cylinder two stroke opposed piston engin
Autorzy:
Alqahtani, A. M.
Wyszynski, M. L.
Mazuro, P.
Powiązania:
https://bibliotekanauki.pl/articles/245226.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
opposed-piston
two-stroke
AVL Boost
thermodynamic modelling
Opis:
Opposed-piston (OP) engine’s promising fuel efficiency has attracted the interest of automotive industry in the recent years. The opposed-piston two-stroke (OP2S) engine technology heightens this fuel efficiency benefit and offers advances in structure, power density and thermal efficiency whilst sustaining its lower cost and weight. Today thermodynamic modelling remains an indispensable and cost effective route in the development and optimisation of internal combustion engines (ICEs). To achieve this goal, the OP2S engine is simulated and validated against experimental results in AVL Boost™, which is hailed as one of the most reliable and advanced engine simulation tools. Detailed analyses of the piston dynamics, heat release, scavenging and heat transfers are highlighted in discrete sections of this paper. Having compared distinct heat release models, the Wiebe 2-Zone model emerged efficacious in replicating the heat release characteristics of the PAMAR™ engine. In comparing the numerical and experimental results, the simulation revealed minimal differences in peak pressure, peak temperature and maximum pressure raise rate, under ±2.5% differences for indicated power, IMEP, indicated thermal efficiency (ITE) and ISFC. Subsequently, confidence taken from the validated numerical model is then deployed to investigate the effect of stroke-to-bore (S/B) ratio on OP2S performance. Three combinations of S/B ratios (0.5, 1.25, and 1.69) with identical swept volume are analysed in this study. Utilisation of the validated model ensured the standardisation of intake, exhaust and the combustion systems in order to isolate the effects of S/B ratio. Results indicate that heat losses decrease with increasing S/B ratio because of the reduced surface area-to-volume in the cylinder. Consequently, an improvement in ITE and mechanical efficiency is observed with reduced ISFC for higher S/B ratios. A tendency of upsurge in combustion efficiency is also evident for higher S/B ratio due to reduced heat transfer near minimum volume of the combustion chamber.
Źródło:
Journal of KONES; 2016, 23, 2; 9-16
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation on low calorific syngas combustion in the opposed-piston engine
Autorzy:
Pyszczek, R.
Mazuro, P.
Jach, A.
Teodorczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/133469.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
opposed-piston
syngas
combustion
controlled auto-ignition
CAI
computational fluid dynamics
CFD
tłok przeciwbiezny
gaz syntezowy
spalanie
kontrolowany samozapłon
obliczeniowa dynamika płynów
Opis:
The aim of this study was to investigate a possibility of using gaseous fuels of a low calorific value as a fuel for internal combustion engines. Such fuels can come from organic matter decomposition (biogas), oil production (flare gas) or gasification of materials containing carbon (syngas). The utilization of syngas in the barrel type Opposed-Piston (OP) engine arrangement is of particular interest for the authors. A robust design, high mechanical efficiency and relatively easy incorporation of Variable Compression Ratio (VCR) makes the OP engine an ideal candidate for running on a low calorific fuel of various composition. Furthermore, the possibility of online compression ratio adjustment allows for engine the operation in Controlled Auto-Ignition (CAI) mode for high efficiency and low emission. In order to investigate engine operation on low calorific gaseous fuel authors performed 3D CFD numerical simulations of scavenging and combustion processes in the 2-stroke barrel type Opposed-Piston engine with use of the AVL Fire solver. Firstly, engine operation on natural gas with ignition from diesel pilot was analysed as a reference. Then, combustion of syngas in two different modes was investigated – with ignition from diesel pilot and with Controlled Auto-Ignition. Final engine operating points were specified and corresponding emissions were calculated and compared. Results suggest that engine operation on syngas might be limited due to misfire of diesel pilot or excessive heat releas which might lead to knock. A solution proposed by authors for syngas is CAI combustion which can be controlled with application of VCR and with adjustment of air excess ratio. Based on preformed simulations it was shown that low calorific syngas can be used as a fuel for power generation in the Opposed-Piston engine which is currently under development at Warsaw University of Technology.
Źródło:
Combustion Engines; 2017, 56, 2; 53-63
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological Examination of Different Steel Materials after Special Heat Treatment and Salt Bath Nitriding
Autorzy:
Opaliński, M.
Mazuro, P.
Klasik, A.
Rostek, E.
Powiązania:
https://bibliotekanauki.pl/articles/351726.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tribology
mechanical properties
steel alloys
friction coefficient
Opis:
The main aim of the presented research was examination of new tribological pairs made of different types of steel. Materials of disc probes were submitted to unusual heat treatment processes and salt bath nitriding. The research is focused on the friction coefficients and mass losses of the material probes. Based on the results it was noticed that the best wear resistant pair was bearing steel 100Cr6 coupled with high speed steel S705. The lowest friction coefficient appeared for the pair bearing steel 100Cr6 and maraging steel C350.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1881-1888
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the effect of variable compression ratios performance on opposed piston 2-stroke engine
Autorzy:
Alqahtani, A.
Wyszynski, M. L.
Mazuro, P.
Xu, H.
Powiązania:
https://bibliotekanauki.pl/articles/133658.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
opposed-piston
AVL BOOST
VCR
compression ratio
numerical simulation
tłok przeciwbieżny
stopień sprężania
symulacja numeryczna
Opis:
Numerous skills involving the introduction of (OP) opposed piston engine have been developed in the recent past. Indeed, novel techniques can help to improve the performance of the engine. The aim of this paper is to model and simulate a simple single-cylinder two-stroke opposed-piston engine and minimise fuel consumption and heat loss, using the software programme AVL BOOST™. AVL BOOST is an engine modelling software, which analyses the performance of a modelled single cylinder two-stroke opposed-piston engine by changing desired parameters. In order to meet this aim, experimental results from a unique engine are used to make a comparison with the results obtained from AVL BOOST model. Six combinations of compression ratios (12, 13.5, 15, 16.5, 18 and 19.5) are analysed in this study with the engine speed running at 420 rpm and 1500 rpm. In addition to the compression ratios, the effect of stroke-to-bore (S/B) ratios on OP2S performance is investigated. Various values of S/B ratios, whilst maintaining a constant swept volume, port geometry and combustion timing, and their effect on fuel consumption and heat loss are analysed in this study. A comparison between the two engine speeds with increasing combinations of compression ratios, and the S/B ratios revealed minimal differences in peak pressure, peak temperature, IMEP, ISFC, indicated efficiency and total heat loss. Detailed analyses of these parameters are highlighted in discrete sections of this paper.
Źródło:
Combustion Engines; 2017, 56, 4; 97-106
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-12 z 12

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