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    Wyświetlanie 1-6 z 6
    Tytuł:
    Comparison of breakup models in simulation of spray development in direct injection SI engine
    Autorzy:
    Ćwikowski, P.
    Jaworski, P.
    Teodorczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/247550.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    direct injection
    combustion
    gasoline
    breakup models
    SGDI
    Opis:
    Nowadays the wide range of spark ignition (SI) engines with spray guided direct injection (SGDI) is in production. Spray development is playing a major role in advanced engine design with three-dimensional computational fluid dynamics (CFD). Nevertheless still there is a need for improvement in CFD injection simulations because of the high pressure injection. The high pressure injection influences the drop breakup, coalescence and evaporation which are critical for proper representation of simulated phenomenon. Computer codes, like FIRE, give a possibility to simulate the process of injection with various types of breakup models. In spite of the importance of atomization, mechanisms of breakup are still not well understood. To obtain better understanding of breakup models simulations have been performed for the engine combustion chamber with inlet andoutlet system and SGDI strategy. For that the model was at first constructed and then imported to the Fire code. After meshing process the model has 2 million cells. The engine is not boosted and as fuel the ethanol is used. The calculations were performedfor 3500 rpm. The influence of different breakup regimes on the spray shape is presented in this study. Comparison is made for Wave, TAB (Taylor Analogy Breakup) and Reitz-Diwkar breakup models.
    Źródło:
    Journal of KONES; 2010, 17, 4; 123-130
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A LES numerical approach for investigating the cycle-to-cycle combustion pressure variability in a direct injection gasoline engine
    Metoda LES jako narzędzie do analizy fluktuacji ciśnienia dla kolejnych cykli pracy w silnikach benzynowych o wtrysku bezpośrednim
    Autorzy:
    Teodorczyk, A.
    Jaworski, P.
    Priesching, P.
    Tatschl, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/132920.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    gasoline engine
    direct injection
    cycle-to-cycle variability
    large eddy simulation
    LES
    combustion
    SCRE
    wtrysk bezpośredni
    fluktuacje cykliczne
    spalanie
    silnik benzynowy
    Opis:
    The Large Eddy Simulation method (LES) has become a powerful computational tool for the application to turbulent flows. It links the classical Reynolds Averaged Navier–Stokes (RANS) approach and Direct Numerical Simulation (DNS). This means that the large eddies are computed explicitly in a time-dependent simulation using the filtered Navier-Stokes equations. The LES resolves the large flow scales that depend directly on the geometry where the small scales are modelled by the subgrid-scale models. LES is expected to improve the description of the aerodynamic and combustion processes in Internal Combustion Engines. This paper addresses the topic of developing the combustion model GCM (Gradient Combustion model) for the Large Eddy Simulation (LES) method. Another part of this paper presents numerical investigations of cycle-to-cycle combustion pressure variability with comparison to experimental data. The Gradient Combustion model (GCM) based on the Turbulent Flame Speed Closure Model (TFSCM) is validated against the experimental data for a multi-cycle gasoline direct injection research engine (SCRE). It is shown that the introduced combustion model is stable and capable of proper representation of the experimental results which is one of the assets of the LES method.
    Metoda LES jest obecnie zaawansowanym narzędziem numerycznym do analizy przepływów turbulentnych. Metoda LES opiera się na połączeniu klasyczej metody uśredniania równań Naviera-Stokes (RANS) z bezpośrednią analizą numeryczną (DNS). Oznacza to, że duże struktury wirowe są rozwiązywane niejawnie poprzez filtrowanie równań Naviera-Stokesa. W metodzie LES oznacza to obliczanie przepływu dużej skali, który zależy od geometrii, podczas gdy przepływ w małej skali jest modelowany modelem podsiatkowym (ang. Sub-grid-scale models, SGS). Uważa się, że metoda LES pozwoli na poprawienie numerycznego opisu aerodynamiki i procesów spalania w silnikach tłokowych. Artykuł przedstawia wyniki prac rozwojowych nad modelem spalania w metodzie LES. Model GCM (model spalania oparty na metodzie gradientu) został zastosowany do obliczeń wielocyklicznych i ich weryfikacji z wynikami eksperymentalnymi. Wyniki eksperymentalne pozyskano z badań na jednocylindrowym silniku badawczym (SCRE) o wtrysku bezpośrednim. W pracy pokazano, że model spalania jest stabilny numerycznie oraz otrzymane wyniki są zgodne z wynikami eksperymentalnymi, co jest jedną z ważniejszych zalet metody LES.
    Źródło:
    Combustion Engines; 2013, 52, 3; 794-799
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser based diagnostic system for spray measurements
    Autorzy:
    Kapusta, Ł. J.
    Jaworski, P.
    Teodorczyk, A.
    Kowalski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/244911.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    spray
    shadowgraphy
    Mie scattering
    LIF
    laser-induced fluorescence
    Opis:
    The paper discusses the capabilities of the laser diagnostic system for dispersed multiphase flows measurements, which was recently commissioned at the Institute of Heat Engineering (ITC) at Warsaw University of Technology. The system presented in the paper is multifunctional and is capable to use different measurements techniques such as shadowgraphy, Mie scattering (scattering on the gas-liquid interface) and LIF (laser induced fluorescence). It provides possibility of switching from one technique to another depending on the characteristics of the observed combustion/injection mixing process. The operational features are discussed in-detail. The study presents the required and possible system setups. Special attention was focused on the system components, which are needed for relevant measurement techniques. Moreover, the limitations of the measurement techniques are discussed and the example measurements are presented. The study shows that using different techniques extends the measurement capabilities of the system with minimum investment costs. This results from the fact that certain system components for different techniques are the same. Moreover, one can conclude that the system design allows certain measurement methods to be applied simultaneously, which results in synergy by making possible drawing more advanced conclusions on observed phenomena
    Źródło:
    Journal of KONES; 2015, 22, 3; 91-98
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the injection frequency on the urea selective catalytic reduction systems performance
    Autorzy:
    Rogóż, R.
    Jaworski, P.
    Kapusta, Ł. J.
    Teodorczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/133789.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    AVL FIRE
    selective catalytic reduction
    uniformity index
    urea water solution
    UWS
    wall-film
    selektywna redukcja katalityczna
    roztwór mocznika
    Opis:
    This study presents the influence of the UWS injection frequency on a close coupled SCR systems performance. The investigation was performed with the CFD tool AVL Fire. In the paper the analysis of four different UWS injection frequencies in the three different operating points of diesel engine was shown. The assessments of the system performance was referred to the ammonia distribution at catalyst intake and wall film formation inside the investigated geometry, as these are considered as crucial in such a configuration. The results showed that injection frequency affects both factors on different level depending from the flow conditions. In addition, the wall film crystallization risk was discussed basing on the obtained wall film characteristics.
    Źródło:
    Combustion Engines; 2017, 56, 3; 73-77
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SCR systems for NOx reduction in heavy and light duty vehicles
    Autorzy:
    Jaworski, P.
    Jarosiński, S.
    Cortes Capetillo, A.
    Kapusta, Ł. J.
    Ziółkowski, A.
    Grzywnowicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/133323.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    NOx
    SCR
    urea
    ammonia
    exhaust
    emissions
    aftertreatment
    heavy duty vehicle
    mocznik
    amoniak
    wylot
    emisja
    obróbka następcza
    Opis:
    Air pollution has become an important worldwide problem. The European Commission credits road and water transport as the major source of NOx pollution, and of being responsible for around 50% of the total air pollution in urban areas. During the last decade, the use of SCR technologies have gained popularity as a method for NOx reduction, the technology is widely considered as one of the solutions for road transport emissions. This paper presents a review of the different SCR system designs derived from the various factors and regulations in the automotive industry which have influenced the technology, along with a parametric study of a proprietary SCR system for heavy duty application.
    Źródło:
    Combustion Engines; 2016, 55, 1; 32-36
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SCR systems for NOx reduction in heavy duty vehicles
    Autorzy:
    Jaworski, P.
    Kapusta, Ł. J.
    Jarosiński, S.
    Ziółkowski, A.
    Cortes Capetillo, A.
    Grzywnowicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/245426.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    NOx
    SCR
    urea
    ammonia
    exhaust
    emissions
    aftertreatment
    heavy-duty vehicle
    Opis:
    Air pollution has become an important worldwide problem. The European Commission credits road and water transport as the major source of NOx pollution, and of being responsible for around 50% of the total air pollution in urban areas. In Poland, around 45% of the country NOx emissions are attributed to transportation. During the last decade, the use of SCR technologies have gained popularity as a method for NOx reduction, the technology is widely considered as one of the solutions for road transport emissions. SCR technology had previously been employed in stationary plants, maritime transportation and other installations using combustion processes in which exhaust conditions are easier to control. The advance on the technology led to the introduction of the first heavy-duty vehicle with an SCR system into the market in 2004. New technologies and applications are constantly appearing, for example, SCR exhaust gas cleaning systems for reciprocating engines are still under development and compression ignition engines can be found in a number of different applications. The technology still needs to be studied and improved as constant problems and knowledge is required in issues such as urea injection, crystallization and NOx reduction efficiency. Moreover, the designs intended for heavy duty vehicles need to meet vehicle limitations and EURO emissions restrictions. This paper presents a review of the different SCR system designs derived from the various factors and regulations in the automotive industry, which have influenced the technology, along with a parametric study of a proprietary SCR system for heavy-duty application.
    Źródło:
    Journal of KONES; 2015, 22, 4; 139-146
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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