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    Wyświetlanie 1-6 z 6
    Tytuł:
    Lean-burn combustion systems in spark ignitron engines: advantages and limitations
    Autorzy:
    Gorczakowski, A.
    Jarosiński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/244092.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    lean combustion
    high compression ratio
    combustion in swirl
    Opis:
    Spark-ignited internal combustion engines are in the use for over130 years (first example was presented by Otto in 1876). The engine development is directed to more power, better efficiency and lower emissions. Mixture formation and in-cylinder motion are the main parameters of the combustion process improvement. One of the effective methods of engine development is lean combustion. Application of lean-burn combustion systems in spark ignitron engines has been proposed many times. Such systems have several important advantages in comparison with conventional systems. Lean-burn combustion makes possible engine operation at high compression ratio, equivalent to high thermal efficiency and at low emission of toxic components of the combustion gases. Lean-burn combustion is also a subject of serious limitations, requiring remedial steps. General limitations are introduced by a fall of the reaction rate, equivalent to increased time of combustion. Lean-burn combustion introduces also changes to flame structure: it contributes with increased flame thickness and with a rise of quenching distance. These changes influence limit conditions of spark ignition. The only solution omitting this threat might be obtained by replacing of a spark ignition by another ignition system or by application of a spark ignition system with increased distance between electrodes and with much higher ignition energy. Typical solutions rationalizing lean-burn combustion in engines are discussed in the paper and some limit conditions highlighted..
    Źródło:
    Journal of KONES; 2008, 15, 2; 97-102
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lean-burn CNG engine with ignition chamber: from the idea to a running engine
    Autorzy:
    Weißner, Michael
    Beger, Frank
    Schüttenhelm, Martin
    Tallu, Gunesh
    Powiązania:
    https://bibliotekanauki.pl/articles/133168.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    CNG
    scavenged prechamber
    lean combustion
    ignition system
    efficiency
    oczyszczona komora wstępna
    spalanie ubogie
    układ zapłonowy
    wydajność
    Opis:
    Current and further developing CO2 and emission regulations worldwide and the competition to full electric mobility deliver a challenge for internal combustion engines in general. A state of the art solution is the use of natural gas mainly contending methane to reduce CO2 significantly and to offer lowest emission levels. The EU-funded project GasOn developed engine concepts to fully exploit the advantages of CNG. This article describes the development of an innovative, monovalent engine dedicated to Compressed Natural Gas (CNG) and characterised by the lean burn concept and the innovative pre-chamber combustion.
    Źródło:
    Combustion Engines; 2019, 58, 1; 3-9
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of leaning hydrogen-air mixtures on engine combustion knock
    Autorzy:
    Szwaja, S.
    Naber, J. D
    Powiązania:
    https://bibliotekanauki.pl/articles/243860.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    IC engine
    lean hydrogen-air mixture
    combustion knock
    Opis:
    Combustion of lean hydrogen-air mixtures in an internal combustion (IC) spark ignited (SI) engine in respect of combustion knock effect is presented in this paper. It is known that making the combustible mixture leaner leads to both decreasing in-cylinder peak temperature of combustion and lengthening ignition lag. It also increases combustion duration. Having these issues on mind it could be concluded that combustion knock intensity decreases as well. It is reported that such a hypothesis is also correct when hydrogen based fuels are combusted in the IC engine, although hydrogen as an engine fuel, on the contrary to gasoline, is very susceptible to knock generation throughout the entire combustion duration. At the beginning the paper examines the combustion knock intensity on the basis of in-cylinder pressure traces. Next, a test-bed and obtained experimental results of hydrogen combustion in the IC single cylinder CFR engine are showed. Finally, analysis of knock intensity referring to lean hydrogen-air mixture ratio, expressed by the excess air number so-called lambda, is carried out. Significant conclusion from the analysis is that there is strong negative correlation between the hydrogen knock intensity and the excess air number lambda. In the end, comparison with exhaust gas recirculation as alternative way to reduce combustion knock, and constraints for leaning the hydrogen-air combustible mixture for the IC engine are discussed in the paper.
    Źródło:
    Journal of KONES; 2008, 15, 2; 483-491
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel catalytic converter oxide for SI engines
    Autorzy:
    Jankowski, A.
    Kruczynski, S. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/246162.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    combustion engines
    ecology
    exhaust emission
    lean mixtures
    catalytic converters
    Opis:
    Subject of the paper are converters of lean mixtures for SI engines with a good efficiency of NOx reduction. Investigation of new effective catalytic materials having good sorptive proprieties of nitrogen oxides and simultaneously resistant on the thermal destruction and chemical destruction are main aim of the paper. The operating idea of such converters and conditions of their work are also presented. Main objective of the paper is performance of the new reactor of the Pt/Rh-MgO/CeO2/Al2O3 formula. The magnesium oxide MgO is here an absorber of nitrous oxides and has an essential feature, it is resistant on sintering. Such reactor can be the alternative for generally applied converters containing the barium oxide. Experimental results of catalytic converter containing various quantities of magnesium oxide for SI engines with lean mixtures are presented in the paper. Researches involved both laboratory and engine tests. The laboratory researches concern the topography active surface of the reactor with the scanning electron microscopy) method. Size of platinum and rhodium crystallites obtainedfrom the Scherrer dependence analyzing the diffractive spectrum of the X-radiation (XRD) was about 5 nm. Moreover method covering of reactor's active layers on the metal- monolith is presented. Engine researches comprised CO, THC, and NOx conversion for two engines in conditions of lean (A/F=20.0), reach (A/F=14.0), and stoichiometric (A/F=14.7) mixtures. CO, THC, and NOx conversion were stated in the dependence of temperature catalytic process in conditions of the various mixtures.
    Źródło:
    Journal of KONES; 2010, 17, 1; 177-186
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of the thermal cycle of SI engine fuelled by liquid and gaseous fuel
    Modelowanie obiegu cieplnego silnika ZI zasilanego paliwem cieklym i gazowym
    Autorzy:
    Kociszewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/792772.pdf
    Data publikacji:
    2011
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    combustion engine
    exhaust emission
    modelling
    thermal cycle
    engine fuel
    gaseous fuel
    liquid fuel
    lean mixture
    numerical analysis
    Opis:
    Results of numerical analysis of methane and gasoline combustion in SI engine are presented in the paper. Work parameters of engine fuelled by gasoline and methane lean mixtures (excess air factor equals λ = 1.8) are compared.
    W artykule przedstawiono wyniki analizy numerycznej procesu spalania metanu oraz benzyny w silniku ZI. Porównano parametry pracy modelu silnika zasilanego ubogimi mieszankami benzyny i metanu, przy współczynniku nadmiaru powietrza λ = 1.8.
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2011, 11C
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of work parameters of gaseous SI engine
    Optymalizacja parametrów pracy silnika gazowego ZI
    Autorzy:
    Kociszewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/793332.pdf
    Data publikacji:
    2013
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    spark ignition engine
    methane
    gaseous fuel
    numerical modelling
    lean mixture
    work parameter
    nitric oxide
    combustion process
    3D modelling
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2013, 13, 2
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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