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International Journal of Automotive Technology > Volume 9(2); 2008 > Article
International Journal of Automotive Technology 2008;9(2): 123-128.
SCAVENGING A SUB-CHAMBER TYPE CNG FUELED ENGINE
S. S. CHUNG, J. K. YEOM, J. S. PARK
Dong-A University
ABSTRACT
The sub-chamber type gasoline engine was suggested to be a type of clean engine, but the presence of residual gas in the sub-chamber was a serious fault. In this experimental study, the CNG direct injection method was applied to scavenge residual gas from the sub-chamber. The CVC (constant volume chamber) is divided into the sub-chamber and mainchamber and used as the main experimental apparatus. Because each combustion chamber of the CVC has an injector, the injector can be used freely, at the same time or individually. Therefore, the scavenging efficiency can be improved by changing injection times for the sub-chamber. The experimental results demonstrated that when all the fuel was injected into the subchamber, the combustion duration was shortened by 30% compared to that of injection into the main-chamber. Although residual gas was observed in the CVC, when the frequency of injections into the sub-chamber increased, good combustion characteristics were obtained.
Key Words: CNG, Sub-chamber, Combustion, Emission, Scavenging, Radical
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