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    Wyświetlanie 1-5 z 5
    Tytuł:
    Rotating combustion chambers as a key feature of effective timing of turbine engine working according to Humphrey cycle – CFD analysis
    Autorzy:
    Tarnawski, Piotr
    Ostapski, Wiesław
    Powiązania:
    https://bibliotekanauki.pl/articles/2173712.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pressure gain combustion
    Humphrey cycle
    turbine engine
    CFD analysis
    valve timing system
    isochoric combustion
    engine energy efficiency
    sealing system
    ciśnienie spalania
    cykl Humphreya
    silnik turbinowy
    analiza CFD
    układ rozrządu
    spalanie izochoryczne
    sprawność energetyczna silnika
    system uszczelniający
    Opis:
    The paper presents a concept of a new turbine engine with the use of rotating isochoric combustion chambers. In contrast to previously analyzed authors’ engine concepts, here rotating combustion chambers were used as a valve timing system. As a result, several practical challenges could be overcome. An effective ceramic sealing system could be applied to the rotating combustion chambers. It can assure full tightness regardless of thermal conditions and related deformations. The segment sealing elements working with ceramic counter-surface can work as self-alignment because of the centrifugal force acting on them. The isochoric combustion process, gas expansion, and moment generation were analyzed using the CFD tool (computational fluid dynamics). The investigated engine concept is characterized by big energy efficiency and simple construction. Finally, further improvements in engine performance are discussed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 5; art. no. e143100
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Increase of efficiency of SI engine through the implementation of thermodynamic cycle with additional expansion
    Autorzy:
    Noga, M.
    Sendyka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/200877.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative five-stroke engine cycle
    Carnot cycle
    Otto cycle
    five-stroke engine
    additional expansion
    increase of thermal efficiency of the five-stroke engine cycle
    Opis:
    The paper presents the theoretical basis and practical implementation of the concept of a five-stroke cycle where an additional expansion of the working medium is achieved in a separate cylinder. The work, carried out at the Cracow University of Technology, constitutes a development of the idea of five-stroke engine. This paper proposes a new theoretical thermodynamic cycle that describes the processes occurring in a five-stroke engine. It has been taken into consideration that the expansion ratio of the engine is twice the compression ratio. At the next step an analysis of the thermodynamic cycle with particular emphasis on its thermal efficiency compared to efficiency of four-stroke engine has been shown. In the second part of the article selected research results of the five-stroke engine built based on the existing four-cylinder spark ignition engine have been presented. A comparison of the total efficiency obtained by the engine in the four- and five-stroke version has been provided. Similar comparisons for specific emission of the selected exhaust components have also been given.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 349-355
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new concept of dual fuelled SI engines run on gasoline and alcohol
    Nowa koncepcja dwupaliwowego zasilania silników o zapłonie iskrowym benzyną i alkoholem
    Autorzy:
    Stelmasiak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/224359.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zasilanie dwupaliwowe
    silnik dwupaliwowy
    alkohol metylowy i benzyna
    SI engine
    dual fuel
    thermal efficiency
    toxicity
    alcohol share
    Opis:
    The paper discusses tests results of dual-fuel spark ignition engine with multipoint injection of alcohol and gasoline, injected in area of inlet valve. Fuelling of the engine was accomplished via prototype inlet system comprising duplex injectors controlled electronically. Implemented system enables feeding of the engine with gasoline only or alcohol only, and simultaneous combustion of a mixture of the both fuels with any fraction of alcohol. The tests were performed on four cylinders, spark ignition engine of Fiat 1100 MPI type. The paper presents comparative results of dual-fuel engine test when the engine runs on changing fraction of methyl alcohol. The tests have demonstrated an advantageous effect of alcohol additive on efficiency and TCH and NOx emission of the engine, especially in case of bigger shares of the alcohol and higher engine loads.
    W artykule przedstawiono wyniki badań dwupaliwowego silnika o zapłonie iskrowym z wielopunktowym wtryskiem alkoholu i benzyny w okolice zaworu dolotowego. Zasilanie silnika realizowano przez prototypowy układ dolotowy zawierający podwójne wtryskiwacze sterowane elektronicznie. Zastosowany system umożliwia zasilanie silnika samą benzyną lub alkoholem oraz spalanie równoczesne mieszaniny obydwu paliw o dowolnym udziale alkoholu. Badania wykonano na 4-cylindrowym silniku o zapłonie iskrowym Fiat 1100 MPI. W artykule przedstawiono porównawcze wyniki badań sprawności i stężenia toksycznych składników spalin silnika zasilanego dwupaliwowo o zmiennym udziale alkoholu metylowego. Badania pokazały korzystny wpływ dodatku alkoholu na sprawność i ekologiczne własności silnika, szczególnie dla większych udziałów alkoholu i obciążeń silnika.
    Źródło:
    Archives of Transport; 2011, 23, 2; 209-221
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic analysis and analytical simulation of the Rallis modified Stirling cycle
    Autorzy:
    Ranjan, Ravi Kant
    Verma, Suresh Kant
    Powiązania:
    https://bibliotekanauki.pl/articles/240284.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rallis modified Stirling cycle engine
    nonisothermal characteristics
    power output
    thermal efficiency
    charakterystyki nieizotermiczne
    moc użyteczna
    sprawność cieplna
    Opis:
    A Stirling cycle was developed by Rallis considering the adiabatic behaviour instead of isothermal behaviour of working fluid inside the expansion/compression volume, since the isothermal processes are very difficult to be realised in actual practice due to irreversibilities. In order to increase the performance of Rallis Stirling cycle engine, two modified versions of Rallis Stirling cycle engine model have been proposed and developed, called as Rallis modified Stirling cycle engine (RMSE). In this paper, the thermodynamic analysis of the developed models have been carried out and the simulated results are compared with the Rallis ideal model of Stirling cycle engine, as this model describes more accurately the thermodynamic cycle of practical Stirling machines. The results reveal the fact that the thermal efficiency of RMSE I model is enhanced by 38.06% and that of RMSE II model by 48.42%, whereas the power output is increased by 58.05% and 78.19% in case of RMSE I and RMSE II model respectively, when compared with the Rallis ideal adiabatic model of Stirling engine.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 2; 35-67
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study of performance and emissions of SI engine with a two-stage combustion system
    Autorzy:
    Jamrozik, A.
    Tutak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/185841.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silnik z dwustopniowym systemem spalania
    współczynnik nadmiaru powietrza
    engine with two-stage combustion system
    prechamber
    excess air factor
    indicated work
    indicated efficiency
    non-repeatability factor of the indicated work
    Opis:
    Lean mixture burning leads to a decrease in the temperature of the combustion process and it is one of the methods of limiting nitric oxide emissions. It also increases engine efficiency. An effective method to correct lean mixture combustion can be a two-stage system of stratified mixture combustion in an engine with a prechamber. This article presents the results of laboratory research on an SI engine (spark ignition) with a two-stage combustion system with a cylinder powered by gasoline and a prechamber powered by propane-butane gas LPG (liquefied petroleum gas). The results were compared to the results of research on a conventional engine with a one-stage combustion process. The test engine fuel mixture stratification method, with a two-stage combustion system in the engine with a prechamber, allowed to burn a lean mixture with an average excess air factor equal to 2.0 and thus led to lower emissions of nitrogen oxides in the exhaust of the engine. The test engine with a conventional, single-stage combustion process allowed to properly burn air-fuel mixtures of excess air factors X not exceeding 1.5. If the value X > 1.5, the non-repeatability factor COVLi increases, and the engine efficiency decreases, which makes it virtually impossible for the engine to operate. The engine with a two-stage combustion process, working with X = 2.0, the QmlQim = 2.5%, reduced the NOx content in the exhaust gases to a level of about 1.14 g/kWh. This value is significantly lower than the value obtained in a conventional engine, which worked at X = 1.3 with comparable non-repeatability of successive cycles (about 3%) and a similar indicated efficiency (about 34%), was characterised by the emissions of NOx in the exhaust equal to 26.26 g/kWh.
    Źródło:
    Chemical and Process Engineering; 2011, 32, 4; 453-471
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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