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2 2013

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

Cygnar M., Budzik G.

Journal of KONES

2013

Vol. 20, No. 1

41--48

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.

Numerical simulation of flow and combustion in spark-ignition piston engine

Jasiński D., Gieras M.

Archivum Combustionis

2013

Vol. 33 nr 4

207--214

The The paper presents results of numerical simulations of combustion processes inside a piston engine with spark-ignition. The simulation was performed using ANSYS Fluent. For simulation of the combustion process, a new model of combustion, being an extension of a model available in the software, taking into account gas recirculation was proposed. This model was then implemented in the program Fluent by means of the User Defined Scalars and User Defined Functions. As the object of analysis, Fiat FIRE 1108 engine was used. Comparison of the basic engine parameters, obtained from the simulations with actual engine performance, indicates a fairly good agreement, and thus possibility of applying of this approach in a simplified simulation of spark-ignition engines.