SCAVENGING OF THE SUB CHAMBER OF THE ENGINE USING CNG FUEL

Abstract

It was proposed that the sub-chamber style gasoline engine was a type of clean engine, but a significant flaw was the presence of residual gas in the sub-chamber. The CNG direct injection method was introduced to scavenge residual gas from the sub-chamber in this experimental sample. The CVC (constant volume chamber) is split into and used as the main experimental apparatus in the sub-chamber and main chamber. Since there is an injector in any CVC combustion chamber, the injector may be used freely, at the same time or individually. Therefore, by adjusting injection times for the sub-chamber, the scavenging performance can be increased. The experimental results showed that the combustion time was shortened by 30 percent relative to that of injection into the main chamber when all the fuel was injected into the sub chamber. Even though residual gas was observed in the CVC, good combustion characteristics were obtained when the number of injections into the sub-chamber increased.