Temat: two-cycle engine - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Analysis of parameters of the engine working in two thermodynamic cycles
Autorzy:: Cygnar, M.
Tematy:: two cycle engine
two fuel injection systems; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247920.pdf Link otwiera się w nowym oknie
Opis:: The article presents an experimental research conducted on a test engine based on a driving unit with a spark ignition Toyota Yaris 1,300 cm 3, equipped with two systems of power supply i.e.: fundamental and ignition. Two methods of initiating the combustion process were applied in the engine i.e.: from spark ignition and after it has turned off - the combustion is initiated by means of the injection of the ignition dose. The fundamental task of The adaptation of two power supply systems for a combustion engine is the possibility of work in two thermodynamic circulations, which permits better conditions for creating the fuel-air mixture, which translates directly into significant improvement of the engine's working parameters accuracy, such as general efficiency as well as the individual fuel consumption. The experimental research presented in this work consist of designing and construction of an engine with two injection systems with a controller managing the automatic change of the work mode, as well as the execution of the analysis of the chosen work parameters in a two-cycle engine i.e.: - comparative research on the engine's work performance, when it works with a spark ignition and when it is initiated with the autoignition of the ignition dose, - determining the increase in the general efficiency of the two-cycle engine, working with the injection of the ignition dose, in comparison with the conventional power supply system with the initiation of the combustion process from an electric discharge between the spark plug electrodes. Applying the two-cycle engine with two power supply systems with an automatic spark ignition presented in this article, along with the electronically controlled system of changing the ignition method, increases the general efficiency in the total range of rotational speed, compared with the conventional engines with the automatic spark ignition
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Modelling of process of injection and combustion in two - cycle engine
Autorzy:: Cygnar, M.
Tematy:: two cycle engine
two fuel injection systems; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246482.pdf Link otwiera się w nowym oknie
Opis:: Article presents simulated research and visualization of combustion process of four-cylinder test engine based on the spark ignition engine Toyota Yaris 1.300 cm3, equipped with two systems of power supply i.e. : fundamental and ignition. Two methods of initiating the combustion process were applied in the engine, that is : from spark ignition and after it has turned off - the combustion is initiated by means of the injection of the ignition dose. The conducted research was aimed at revealing the differences in the combustion process and the engine performance, especially the changes of pressure in the cylinder for that kind of dual-fuel power engine supply. The ignition dose injected to cylinder was equal to about 5% of the general mass of the fuel given to the engine. The mass of the fuel injected to the infold manifold determined the remaining part, and direct injection of fuel took place for several dozen rotation degrees of the crankshaft before TDC (Top Dead Centre). A spatial grid of the engine's model (preprocessor) was created as well as the modification of the source KIVA 3V program was executed, consisting of taking into account two systems of injection. It is necessary to mention, that KIVA 3V program contains only one source of fuel's injection as a default. On two-dimensional graphs, the courses of changes of pressure and temperature are presented as well as the change of the mass of the injected ignition dose. A simulation was conducted for chosen rotation angles of the crankshaft, for the purpose of a radical analysis of thermodynamic parameters along with an analysis of the toxic components of the exhaust fumes. The conclusions of the conducted simulated research confirm the reduction of fuel consumption with a simultaneous reduction of the emissions of toxic exhaust fumes components.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Test bed studies of an engine with combustion initiation from ignition dose of fuel
Autorzy:: Sendyka, B.
Noga, M.
Tematy:: two-cycle engine
compression ignition
spark ignition
total efficiency of engine; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/245825.pdf Link otwiera się w nowym oknie
Opis:: Results of test bed studies of combustion engine with work possibility with application of spark ignition and combustion from ignition dose injected directly into the combustion chamber were described in this article. In engine working according to the patent solution of Prof. B. Sendyka, during start and work at low rotational speed and low load a system realizing spark ignition of homogenous mixture formed in classical way in the intake manifold is active. For higher rotational speeds and heavy load the ignition system is switched off whereas, injectors of ignition dose injecting fuel by the end of the compression stroke directly into the working space of the engine are activated. The fuel dose injected into the combustion chamber undergoes auto-ignition and in this way the combustion process in the whole volume of the homogenous combustion charge accumulated in the cylinder is initiated. The mass of ignition dose of fuel constitutes about 5 – 10% of the whole fuel mass per working cycle what differs decisively the presented solution from other known engines working according to similar principles. Application of two combustion system in four stroke combustion engine aims at combining the advantages of spark ignition a compression ignition engines. The engine is characterized by easy starting and during work at higher rotational speed and higher load in the mode of ignition from pilot dose exploitation efficiency of energy contained in fuel is higher than for spark ignition engine, this finds direct reflection in increase in total efficiency by over 9% as related to the base value.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Study of Atkinson cycle in two-stroke diesel engine with opposed pistons
Autorzy:: Mitianiec, Władysław
Tematy:: transport
two-stroke opposite piston engine
Atkinson cycle
scavenging
timing phases
silnik o tłokach przeciwbieżnych
obieg Atkinsona
wymiana ładunku; Pokaż więcej
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Powiązania:: https://bibliotekanauki.pl/articles/133583.pdf Link otwiera się w nowym oknie
Opis:: The paper presents possibilities of change working parameters of two-stroke diesel engine with opposed pistons. Obtaining of higher engine efficiency is realized by applying of Atkinson cycle. Modification of scavenging process by changing pistons' position connecting with two crankshafts enables asymmetrical scavenge timing. Decreasing of shorter time of closing exhaust ports before compression process and longer expansion process give higher engine work and with high charging ratio increases engine power. These types of engines are recently recommended for power plant stations. The paper includes full analysis of engine work with scavenge and combustion processes for different timing phases based on geometry of the CI Leyland L60 engine by using of CFD modelling and own 0D model. Simulation tests indicate a high scavenge efficiency, good penetration of injected fuel and fast combustion process. The work contains figures of pressure, temperature traces and emission of main chemical species in exhaust gases with comparison of engine works for different timing phases. Atkinson cycle in two-cycle work of engine and full combustion process enables to achieve high total efficiency. The study is an input for realization of such processes in a future of power plant engines with different fuelling systems.
Dostawca treści:: Biblioteka Nauki

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