Wyniki wyszukiwania - BazTech

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Determination of the total efficiency for engine with spark - ignition and compression - ignition

Cygnar M., Budzik G.

Journal of KONES

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2013

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Vol. 20, No. 1

41--48

EN

This paper presented of developing a power system for two fuel injection systems – spark ignition and compression ignition. Two ways to initiate combustion process were used: initially the spark ignition, and after it turns off - the combustion is initiated by the injection of ignition injected fuel. The composition of the ignition dose was developed through the research conducted in order to adjust the right proportions of chemical components to obtain the best parameters of the combustion process. The study considered the performance of the ignition dose injected into the engine cylinder and its evaporation process, the charge stratification, the formation of toxic emission and the total efficiency of the engine. Experimental studies were carried out on a test engine equipped with two injection systems and automatic mode change control management. The scope of research included: – determining the basic characteristics of the engine operation, taking into account the injection advance angle of the ignition dose, – comparative studies of engine performance and exhaust gas composition, working with spark ignition and initiated by compression ignition of the ignition dose, – determining the increase in the general efficiency of the two-circulation engine working with injection of ignition dose compared to conventional power system with the initiation of combustion process from the spark plug.

2

Modelling of process of injection and combustion in two - cycle engine

Cygnar M.

Journal of KONES

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2012

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Vol. 19, No. 3

75-84

EN

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.

3

Analysis of parameters of the engine working in two thermodynamic cycles

Cygnar M.

Journal of KONES

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2012

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Vol. 19, No. 2

95-102

EN

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