The Roll of Connecting Nozzle and the Flame Initiation Point in the Performance of a Dual Chamber Stratified Charge Engine

Experimental work is carried out to investigate the importance of the connecting nozzle between the auxiliary and the main chambers and the ignition point location to the performance of a stratified charge spark ignition engine using Broderson's method of charge stratification. Thre different nozzle configurations and two ignition point locations were used in the present experiment.

The study shows that the fuel economy obtained with this approach is dependent upon the nozzle geometry which also plays an important role in the combustion noise generation, a characteristic of this method. The results show good fuel consumption over the entire range; the analytical work on the combustion of the mixture in the auxiliary chamber indicates that flame initiation near the center of the nozzle opening has a potential of restricting the flow of unburned mixture in the main chamber.