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Effects of Hydrogen Addition to Intake Mixture on Combustion and Exhaust Emission Characteristics of a Diesel Engine
Published May 20, 2009 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
The present study experimentally investigated the performance and emission characteristics of the diesel engine with hydrogen added to the intake air at late diesel-fuel injection timings. The diesel-fuel injection timing and the hydrogen fraction in the intake mixture were varied while the gross heating value of diesel fuel and hydrogen was kept constant at a certain value. As the hydrogen fraction was increased, NO first decreased, attained minimum, and then increased. The maximum rate of in-cylinder pressure rise also showed minimum at 10 vol% hydrogen fraction. The indicated thermal efficiency was almost constant or slightly increased with small amount of hydrogen. A combination of hydrogen addition and late diesel-fuel injection timing contributed to low temperature combustion, in which NO decreased without the increase in unburned fuel.