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Tytuł:
Experimental research of oil pump for a compression-ignition aircraft engine
Autorzy:
Szlachetka, Marcin
Sochaczewski, Rafał
Gęca, Michał Jan
Powiązania:
https://bibliotekanauki.pl/articles/133729.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
diesel engine
opposed-piston engine
aircraft propulsion system
oil system
oil pump
silnik wysokoprężny
silnik o tłokach przeciwbieżnych
układ napędowy samolotu
układ olejowy
pompa oleju
Opis:
The paper presents an analysis of the constructions of oil pumps for an aircraft compression ignition engine. It is a two-stroke liquid-cooled engine with a power of 100 kW. The system has 3 cylinders and 6 opposed pistons. The paper estimates the required oil pump capacity to make the engine components well-lubricated. Next, automotive oil pumps for diesel engines are analyzed to select a correct pump for aircraft diesel engine applications. Three pump constructions of different constructions and dimensions of a rotor were select-ed. A measurement bench was designed and built to test these oil pumps in the range of pump shaft speeds from 0 to 4500 rpm and volumetric flow rate up to 150 l/min. The bench also enables stabilization of oil temperature at the required level within the range from 30 to 120oC. In addition, flow resistance through engine slide bearings was simulated by changing the position of a throttling valve at the pump output to regulate pressure in the range of 0-700 kPa. The obtained capacity characteristics of individual pumps versus on oil pressure and temperature allowed us to find an appropriate oil pump to make individual engine nodes well-lubricated.
Źródło:
Combustion Engines; 2019, 58, 4; 142-146
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
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:
An investigation of the fuel injector dedicated to the aircraft opposed-piston two-stroke diesel engine
Autorzy:
Siadkowska, Ksenia
Wendeker, Mirosław
Grabowski, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/133769.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
diesel engine
injector
opposed-piston engine
spray range
silnik diesla
wtryskiwacz
silnik o tłokach przeciwbieżnych
Opis:
The paper presents the research results of the injector construction with the modified injection nozzle. The injector is designed for a prototype opposed-piston aircraft diesel engine. The measurements were based on the Mie scattering technique. The conditions of the experiment corresponded to maximum loads similar to those occurring at the start. The measuring point was selected in line with the analysis of engine operating conditions: combustion chamber pressure at the moment of fuel delivery (6 MPa) and fuel pressure in the injection rail (140 MPa). The analysis focused on the average spray range and distribution, taking into account the differences between holes in the nozzle. As a result of the conducted research, the fuel spray range was defined with the determined parameters of injection. The fuel spray ranges inside the constant volume chamber at specific injection pressures and in the chamber were examined, and the obtained results were used to verify and optimize the combustion process in the designed opposed-piston two-stroke engine.
Źródło:
Combustion Engines; 2019, 58, 2; 151-155
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studying a construction of pistons for the aircraft CI engine
Autorzy:
Siadkowska, K.
Majczak, A.
Barański, G.
Powiązania:
https://bibliotekanauki.pl/articles/973134.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
aircraft engine
piston
CI engine
opposed-piston engine
designing pistons
silnik z przeciwbieżnym układem tłoków
projektowanie tłoków
silnik lotniczy
tłok
silnik o zapłonie samoczynnym
Opis:
This paper examines the selected constructions of piston for aircraft CI engines and discusses tendencies in a development of piston designs. The paper addresses the question of using new materials and coatings to improve quality of pistons and the study of heat transfer and methods to absorb heat from a piston by means of cooling ducts. The selected materials were examined in terms of their advantages and drawbacks. The paper discusses different shapes of piston heads and their impact on combustion as well as indicates other factors behind parameters of combustion and toxic emission like injector shape types, lubrication types and clearances in the combustion chamber.
Źródło:
Combustion Engines; 2017, 56, 1; 161-167
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic simulation comparison of opposed two-stroke and conventional four-stroke engines
Autorzy:
Shokrollahihassanbarough, F.
Alqahtani, A.
Wyszynski, M. L.
Powiązania:
https://bibliotekanauki.pl/articles/133447.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
opposed piston two-stroke engine
AVL Boost software
thermodynamic benefits
conventional crankshaft engines
silnik dwusuwowy
korzyści termodynamiczne
Opis:
Today’s technology leveraging allows OP2S (Opposed Piston 2-Stroke) engine to be considered as an alternative for the conventional four-stroke (4S) engines as mechanical drive in various applications, mainly in transportation. In general, OP2S engines are suited to compete with conventional 4-stroke engines where power-to-weight ratio, power-to-bulk volume ratio and fuel efficiency are requirements. This paper does present a brief advent, as well as the renaissance of OP2S engines and the novel technologies which have been used in the new approach. Also precise thermodynamic benefits have been considered, to demonstrate the fundamental efficiency advantage of OP2S engines. Hence, simulations of two different engine configurations have been taken into consideration: a one-cylinder opposed piston engine and two-cylinder conventional piston four-stroke engine. In pursuance of fulfilling this goal, the engines have been simulated in AVL Boost™ platform which is one of the most accurate Virtual Engine Tools, to predict engine performance such as combustion optimization, emission and fuel consumption. To minimize the potential differences of friction losses, the bore and stroke per cylinder are taken as constant. The closed-cycle performance of the engine configurations is compared using a custom analysis tool that allows the sources of thermal efficiency differences to be identified and quantified. As a result, brake thermal efficiency, power and torque of OP2S engine have been improved compared to conventional engines while emission concern has been alleviated.
Źródło:
Combustion Engines; 2015, 54, 3; 78-84
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
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:
The closed-cycle model numerical analysis of the impact of crank mechanism design on engine efficiency
Autorzy:
Opaliński, M.
Teodorczyk, A.
Kalke, J.
Powiązania:
https://bibliotekanauki.pl/articles/133029.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
piston motion
engine
simulation
efficiency
opposed
ruch tłoka
silnik
symulacja
wydajność
Opis:
The research presents a review and comparison of different engine constructions. Investigated engines included crankshaft engines, barrel engine, opposed-piston engines and theoretical models to present possible variations of piston motion curves. The work comprises also detailed description of a numerical piston engine model which was created to determine the impact of the cycle parameters including described different piston motion curves on the engine efficiency. Developed model was equipped with Wiebe function to reflect a heat release during combustion event and Woschini’s correlation to simulate heat transfer between the gas and engine components.Various scenarios of selected engine constructions and different working conditions have been simulated and compared. Based on the results it was possible to determine the impact of different piston motion curves on the engine cycle process and present potential efficiency benefits.
Źródło:
Combustion Engines; 2017, 56, 1; 153-160
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crankshaft geometry modification and strength simulations for a new design of diesel opposed-piston engine
Autorzy:
Magryta, Paweł
Pietrykowski, Konrad
Powiązania:
https://bibliotekanauki.pl/articles/24202479.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
crankshaft
FEM
diesel
opposed-piston engine
strength
wał korbowy
MES
silnik o tłokach przeciwbieżnych
wytrzymałość
Opis:
The article presents simulation strength calculations of a newly designed crankshaft for a PZL 100 engine with a reciprocating piston design. This engine is the subject of a research and development project co-financed by NCBR. The article presents four successive versions of the crankshaft geometric changes which underwent strength calculations. Such elements as the outer and inner parts of the crankshaft arm were changed in these geometric versions. The geometry of the shaft was changed using Catia v5 software, while strength calculations were carried out in Abaqus software. In summary, one of the presented models was selected for further work due to the possible simplification of the manufacturing process and the reduction of mass and stresses. This model was further investigated in the project.
Źródło:
Combustion Engines; 2023, 62, 3; 123--128
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the injection timing on the performance of two-stroke opposed-piston diesel engine
Autorzy:
Karpiński, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/117835.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
diesel engine
opposed piston engines
two-stroke engine
injection timing
silnik wysokoprężny
przeciwstawne silniki tłokowe
silnik dwusuwowy
czas wtrysku
Opis:
The performance of the engine strongly depends on the parameters of the combustion process. In compression ignition engines, the fuel injection timing has a significant influence on this process. The moment of its occurrence and its duration should be chosen so that the maximum pressure value occurs several degrees after TDC. In order to analyze the effect of the fuel injection timing on the performance of the tested two-stroke opposed-piston diesel engine, a zero-dimensional model was developed in the AVL BOOST program. Next, a series of simulations were performed based on the defined calculation points for maximum continuous power, which resulted in power, specific fuel consumption and mean in-cylinder pressure. Finally, the engine map was made as a function of the start of combustion angle.
Źródło:
Applied Computer Science; 2018, 14, 2; 69-81
1895-3735
Pojawia się w:
Applied Computer Science
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:
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:
Experimental research of two stroke aircraft diesel engine
Autorzy:
Grabowski, Łukasz
Karpiński, Paweł
Barański, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/133420.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
diesel engine
indicated pressure
opposed-piston
two-stroke
silnik wysokoprężny
ciśnienie indykowane
tłok przeciwbieżny
silnik dwusuwowy
Opis:
This paper presents the results of experimental studies of the opposed-piston diesel engine. This engine was designed during one of the stages of the research on a new-type drive unit for gyrocopter applications. In order to conduct research, a special test stand as well as control and measurement systems were developed. As part of the work on the engine, the fuel injection system, engine temperature control system and measurement systems were designed. In addition, a computer program has been developed for the fuel injection system control (injectors, valves fuel pressure regulators). The paper presents the results of the preliminary tests for a single value of engine speed (1500 rpm) and three values of load defined by torque. The measured value of the indicated pressure made it possible to calculate the maximum pressure. The results obtained from the bench tests were analyzed.
Źródło:
Combustion Engines; 2019, 58, 4; 75-79
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation Research of the Influence of Compression Ratio on the Performance of an Aircraft Piston Diesel Engine
Autorzy:
Grabowski, Łukasz
Karpiński, Paweł
Magryta, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/102502.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
aircraf
compression ratio
diesel engine
opposed-piston
two-stroke
samolot
stopień sprężania
silnik wysokoprężny
tłok przeciwbieżny
dwusuwowy
Opis:
In recent years, the opposed-piston engines have become increasingly popular in the automotive and aerospace industries. Therefore, it is necessary to conduct the research on this type of drive. The paper presents the simulation research of a two-stroke opposed-piston diesel engine designed for propulsion of light aircrafts. The influence of the change of the compression ratio on the selected engine performance was investigated (indicated mean effective pressure, peak firing temperature and pressure, specific fuel consumption, power consumed by the compressor). The AVL BOOST software was used to perform the simulation tests. A zero-dimensional engine model equipped with a mechanical compressor was developed. On the basis of the created model, a series of calculations was performed for the assumed values of the compression ratio for four engine operating points: take-off power, maximum continuous power and cruising power at two different altitudes. The obtained results were subjected to a comparative analysis and the most important conclusions connected with the influence of the change in the compression ratio on the achieved performance were presented.
Źródło:
Advances in Science and Technology. Research Journal; 2020, 14, 3; 175-181
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coolant pump for compression-ignition aircraft engine
Autorzy:
Gęca, Michał Jan
Pietrykowski, Konrad
Barański, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/133232.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
diesel engine
opposed-piston engine
aircraft propulsion system
cooling system
water pump
silnik wysokoprężny
silnik o tłokach przeciwbieżnych
układ napędowy samolotu
układ chłodzenia
pompa wody
Opis:
The article presents an analysis of the design of cooling liquid pumps for a compression-ignition aircraft engine. A 100 kW twin-charged, two-stroke, liquid-cooled engine has 3 cylinders and 6 opposed-pistons. In the first part of the study, the amount of heat needed to be removed by the cooling system was estimated to obtain the required volumetric flow rate. Then, the design of automotive cooling liquid pumps for compression-ignition engines with a Common Rail power supply system and power of about 100 kW was analyzed. The aim of the analysis was to select a suitable pump for applications in the aircraft compression-ignition engine. 5 constructions of different shape, diameter and width of the working rotor were selected. The pressure and volume flow rate were determined for a given rotational speed of the pump on a specially built stand. The operation maps of individual pumps were created to select the most efficient types of pumps.
Źródło:
Combustion Engines; 2019, 58, 4; 52-57
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
Wyświetlanie 1-15 z 16

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