NOx reduction in diesel engines due to port water-injection (comparison of Nox reduction rate between experiment and prediction)

摘要

The effect of port water-injection on the exhaust Nox reduction was examined experimentally as well as theoretically. In the experiment, water was injected into each suction port of a 3 cylinder turbocharged DI diesel engine using gasoline injectors. The exhaust Nox was reduced significantly by port water-injection, and about 50/100 reduction in Nox concentration was obtained by injecting an amount of 0.035kg of water/kg of air under various engine operation conditions.