抄録
To understand the combustion process in an unscavenged horizontal prechamber spark ignition engine, the flame front propagations in the pre-and main chamber are simultaneously visualized with high speed photography, while changing the torch nozzle area. The time histories for a torch flame pattern in the main chamber are found to correspond fairly well to those of heat release rates computed from the pressure diagrams. By using these flame photographs, several combustion characteristics, namely combustion duration, combustion area rate and flame tip velocity are also examined for each torch nozzle with different sectional areas. In addition, the correlation between the combustion characteristics and the engine performances is discussed.
