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    Wyświetlanie 1-5 z 5
    Tytuł:
    Assessment of thermodynamic cycle of internal combustion engine in terms of rightsizing
    Autorzy:
    Sroka, Zbigniew J.
    Dworaczyński, Maciej K.
    Powiązania:
    https://bibliotekanauki.pl/articles/133097.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    internal combustion engine
    thermodynamic cycle
    rightsizing
    silnik o spalaniu wewnętrznym
    obieg termodynamiczny
    Opis:
    The modification of the downsizing trend of internal combustion engines towards rightsizing is a new challenge for constructors. The change in the displacement volume of internal combustion engines accompanying the rightsizing idea may in fact mean a reduction or increase of the defining swept volume change factors and thus may affect the change in the operating characteristics as a result of changes in combustion process parameters - a research problem described in this publication. Incidents of changes in the displacement volume were considered along with the change of the compression space and at the change of the geometric degree of compression. The new form of the mathematical dependence describing the efficiency of the thermodynamic cycle makes it possible to evaluate the operation indicators of the internal combustion engine along with the implementation of the rightsizing idea. The work demonstrated the invariance of cycle efficiency with different forms of rightsizing.
    Źródło:
    Combustion Engines; 2019, 58, 3; 182-186
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wskaźniki pracy silnika spalinowego z bezpośrednim wtryskiem benzyny podczas przyspieszania
    Indexes of operation of combustion engine with direct gasoline injection during accelerating
    Autorzy:
    Pielecha, I.
    Cieślik, W.
    Borowski, P.
    Skowron, M.
    Bueschke, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/134116.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    silnik spalinowy
    nieustalone warunki pracy
    analiza termodynamiczna
    combustion engine
    transient conditions
    thermodynamic analysis
    Opis:
    Silniki o zapłonie iskrowym z wtryskiem bezpośrednim w coraz większym stopniu zastępują silniki z wtryskiem pośrednim benzyny. Wymusza to konieczność prowadzenia badań tych jednostek w nieustalonych warunkach pracy. Celem badań była analiza nieustalonych w arunków podczas swobodnego przyspieszania silnikiem oraz przyspieszania pojazdem. Wykorzystanie systemu do analizy procesów szybkozmiennych pozwoliło na ocenę wskaźników pracy silnika w warunkach swobodnego przyspieszania i przyspieszania pojazdu przy jednoczesnym oszacowaniu strat i sprawności mechanicznej turbodoładowanego silnika z bezpośrednim wtryskiem benzyny.
    Engines with spark ignition and direct injection more and more often replace those with indirect gasoline injection. Due to this it is necessary to conduct tests of those engines in transient operational conditions. The aim of these tests was the analysis of such conditions during free engine acceleration and vehicle acceleration. The use of the system for the analysis of the fast-varying processes enabled estimation of indexes of engine operation during free acceleration and vehicle acceleration and, at the same time, estimation of the losses and mechanical efficiency of the turbocharged engine with direct gasoline injection.
    Źródło:
    Combustion Engines; 2015, 54, 3; 291-299
    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:
    Prechamber optimal selection for a two stage turbulent jet ignition type combustion system in CNG-fuelled engine
    Autorzy:
    Pielecha, Ireneusz
    Bueschke, Wojciech
    Skowron, Maciej
    Fiedkiewicz, Łukasz
    Szwajca, Filip
    Powiązania:
    https://bibliotekanauki.pl/articles/133967.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    gas engine
    prechamber
    thermodynamic analysis
    combustion
    exhaust emission
    optimization
    silnik gazowy
    komora wstępna
    analiza termodynamiczna
    spalanie
    emisja spalin
    optymizacja
    Opis:
    Searching for further reduction of fuel consumption simultaneously with the reduction of toxic compounds emission new systems for lean-mixture combustion for SI engines are being discussed by many manufacturers. Within the European GasOn-Project (Gas Only Internal Combustion Engines) the two-stage combustion and Turbulent Jet Ignition concept for CNG-fuelled high speed engine has been proposed and thoroughly investigated where the reduction of gas consumption and increasing of engine efficiency together with the reduction of emission, especially CO2 was expected. In the investigated cases the lean-burn combustion process was conducted with selection of the most effective pre-combustion chamber. The experimental investigations have been performed on single-cylinder AVL5804 research engine, which has been modified to SI and CNG fuelling. For the analysis of the thermodynamic, operational and emission indexes very advanced equipment has been applied. Based on the measuring results achieved for different pre-chamber configurations the extended methodology of polioptimization by pre-chamber selection and the shape of main chamber in the piston crown for proposed combustion system has been described and discussed. The results of the three versions of the optimization methods have been comparatively summarized in conclusions.
    Źródło:
    Combustion Engines; 2019, 58, 1; 16-26
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic modeling of combustion process of the internal combustion engines - an overview
    Autorzy:
    Stepanenko, Denys
    Kneba, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/134250.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    thermodynamic combustion model
    internal combustion engine
    convective heat transfer coefficient
    Wiebe burning law
    single-zone model
    two-zone model
    heat transfer submodel
    termodynamiczny model procesu spalania
    tłokowy silnik spalinowy
    współczynnik konwekcyjnej wymiany ciepła
    jednostrefowy model procesu spalania
    dwustrefowy model procesu spalania
    podmodel wymiany ciepła
    Opis:
    The mathematical description of combustion process in the internal combustion engines is a very difficult task, due to the variety of phenomena that occurring in the engine from the moment when the fuel-air mixture ignites up to the moment when intake and exhaust valves beginning open. Modeling of the combustion process plays an important role in the engine simulation, which allows to predict incylinder pressure during the combustion, engine performance and environmental impact with high accuracy. The toxic emissions, which appears as a result of fuels combustion, are one of the main environmental problem and as a result the air pollutant regulations are increasingly stringent, what makes the investigation of the combustion process to be a relevant task.
    Źródło:
    Combustion Engines; 2019, 58, 3; 27-37
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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