Temat: gasoline direct injection - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

Tytuł:: The latest achievements in gasoline and diesel injection technology for the internal combustion engines
Autorzy:: Cwikowski, P.
Teodorczyk, A.
Powiązania:: https://bibliotekanauki.pl/articles/242329.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: direct injection
combustion
diesel
gasoline
common rail
dimotronic
Opis:: The paper presents an overview of the latest achievements in gasoline and diesel injection technology. It is already clear that in 20 years' time the internal combustion engine will still be the drive of choicef or the car. Indeed, it still offers a great deal of development potential. Thanks to sophisticated solenoid and piezo-injectors, engineers can no w build smaller engines without sacrificing performance and torque. They refer to this as downsizing. Less engine displacement and fewer cylinders ensure reduced friction losses and therefore greater efficiency. With the same levels of torque, 25 percent less engine displacement cuts fuel consumption by around ten percent. And lower consumption means less CO2. Gasoline and diesel direct injection makes engines even more economical and eco-friendly. Gasoline direct injection, combustion strategies for stratifled-charge operation, GDI injectors, solenoid GDI injectors, piezo GDI injectors, Common Rail Injectors, Common-Rail injectors with piezo actuator, Common-Rail injectors for commercial vehicles, weaknesses of modern high pressure common-rail injectors, multiple injections, Hydrogen Supply Systems, technical requirements for H2 injectors, control range and duration of injection pulse are presented in the paper.
Źródło:: Journal of KONES; 2009, 16, 2; 79-90
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Effects of using a dual-injector fuel system on a process of combustion in a spark-ignition engine
Autorzy:: Sendyka, B.
Noga, M.
Powiązania:: https://bibliotekanauki.pl/articles/246083.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: dual-injector fuel system
gasoline
direct injection
port injection
combustion
spark-ignition engine
Opis:: This paper analyzes aprocess of combustion in a spark-ignition engine. The aim of the analysis was to determine the differences in the combustion process between the engine with a classic multipoint injection system and a system which injects fuel directly to the cylinders as well. To aid in the analysis the measurements of the high variable pressure in the engine's cylinder against the crankshaft angle were taken. This allowed us to obtain indicated diagrams for both types of engines. To eliminate distortions, both functions were approximated using combined functions. The other basic parameters were also measured: torque, RPM and instantaneous fuel consumption. The analysis of the indicated diagrams yielded an indicated mean pressure and thermal efficiency for both fuel systems. Then, a comprehensive analysis ofpressures in cylinders was performed in order to determine the way the flame spreads in the cylinder for the two types of engines. The results obtained from this analysis show that the speed of combustion is greater for the charge formed by the dual-injector fuel system. The increased speed of the combustion, especially when it reaches a 50% fraction of the exhaust gas in the cylinder, is what accounts for the increase in the indicated mean pressure and the increase in the thermal efficiency of the engine with a dual-injector fuel system. The time of the spreading of the flame, as well as the fast burn period were reduced. The increased efficiency of the combustion process in the cylinder me ans that the heat losses through the cylinder sleeve are greatly reduced. The results of the research in this paper confirm the purposefulness of using a dual-injector fuel system in a spark-ignition engine.
Źródło:: Journal of KONES; 2010, 17, 1; 389-397
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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

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