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Combustion and exhaust gas emission characteristics of a diesel engine dual fueled with natural gas
Published October 13, 1999 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
This paper deals with a diesel engine dual-fueled with natural gas. This system can achieve high thermal efficiency at higher loads by utilizing the premixed lean natural gas mixture ignited by pilot-injected diesel fuel. At low loads, however, high THC emission and low thermal efficiency were observed. To resolve these problems, effects of EGR and intake heating with an exhaust to intake heat exchanger on engine performance and exhaust gas emissions were investigated especially at low loads. In addition, 3-CFD simulations were conducted to analyze the combustion process occurring in the combustion chamber by using the KIVA-3 code. The result indicates that thermal efficiency and THC emission at lower loads were improved by intake air heating combined with EGR.