Performance and Emission Analysis of Two Stroke Dual and Triple Spark plug Single Cylinder SI Engine with Gasoline fuel

Two stroke spark ignition engines have high exhaust emissions and low brake thermal efficiency due to the short circuiting losses and incomplete combustion, which occur during idling and at part load operating conditions. An effort is been made to improve the engine parameters i.e. specific fuel consumption and Thermal Efficiency of the engine. This is achieved by using dual spark plug in two stroke gasoline also its effect on the engine parameter is analyzed.A spark-ignition (SI) engine cycle model was used to study the effects of spark plug location on a four spark plug SI engine performance. Constructed simulation can be used for either single- or four-spark plug configuration. For the tetra-spark arrangement, spark plugs were considered to be located diametrically opposite to each other on cylinder head axisymmetrically. According to Dimensionless distance from the cylinder centre to spark plug location on cylinder head, rsd = rs/R, five locations (rsd = 0, 0.25, 0.50, 0.75, and 1.0) were considered. Inevitably rsd = 0 corresponds to the single spark arrangement that the plug is located at the centre. To comparison, single-spark plug configurations were also considered for other selected spark plug locations. From the result of the study it was found that centrally located single-spark plug arrangement gives the best engine performance and fuel economy, while for the all the other spark-plug locations away from the centre tetra-spark arrangement favourable to the single-spark plug configuration.