FL1-1: Exhaust Emission Characteristics of a Diesel Engine with Small Amounts of Hydrogen Added to the Intake Air(FL: Fuels and Lubricants,General Session Papers)

Abstract

Since hydrogen is a carbon-free fuel, hydrogen combustion doesn't generate smoke. The present study investigated exhaust emission characteristics when small amounts of hydrogen were supplied to the intake air in a direct injection diesel engine. The results showed that hydrogen contributed heat release even if its concentration was lower than the lower flammability limit. At medium or high loads, NO increased with hydrogen addition when the diesel-fuel injection timing was earlier than TDC, but NO decreased with hydrogen addition when the diesel-fuel injection timing was later than TDC.