Abstract
The results of numerical analysis of combustion in multi-spark plug SI engine are presented in the paper. The outcome of computational analysis of lean mixtures combustion in engine with one and two spark plugs are compared. The output data was presented in graphical form as screenshots (temperature distribution) and as pressure and temperature courses in function of crank angle. 3D numerical modelling of combustion in multi-spark plug engine proved that improvement in lean mixture combustion process can be obtained by increasing the number of active ignition points. As conclusion it can be stated that numerical modelling results confirmed the favourable influence of applying two active spark plugs in lean mixtures combustion.
Highlights
Since many years in the Institute of Internal Combustion Engines and Control Engineering at the Czestochowa University of Technology one of the direction of research has been 3D modelling of thermal and flow processes occurring in combustion chamber of piston engine with the use of KIVA-3V software [1]
Flow processes in the engine cylinder including liquid fuel injection [8], influence of flow parameters and pressure of gaseous medium on spark ignition process and the development of flame in the cylinder [3], and two-stage combustion process in the engine with pre-chamber fuelled by lean mixtures of air excess number λ ≤ 2.0 [5] have been numerically analyzed
Introducing of the severe regulations concerning toxic components emitted by piston engines forces the development of engine design
Summary
Flow processes in the engine cylinder including liquid fuel injection [8], influence of flow parameters and pressure of gaseous medium on spark ignition process and the development of flame in the cylinder [3], and two-stage combustion process in the engine with pre-chamber fuelled by lean mixtures of air excess number λ ≤ 2.0 [5] have been numerically analyzed. Effective reduction of toxic components emission as well as the increase of SI engines efficiency can be obtained by lean mixtures combustion. It is connected with certain difficulties, such as: decrease in flame propagation velocity and high unrepeatability of engine work. These inconveniences can be partly leveled down for example by introducing of multipoint ignition [6, 9]
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