a b s t r a c t
Abstract: Oxygen-enriched combustion of diesel engine can reduce smoke emission and improve thermal
efficiency, but also lead to the increase of NO emission. In this research, experiments were conducted on
a turbo-charged direct injection diesel engine under the two conditions of 2000 rpm and 180 Nm
equivalent power (57% of the original max load at 2000 rpm) as well as 100% load of this speed. The
combination of intake oxygen enrichment and water emulsified diesel was used to improve the NOsmoke
emissions without serious penalty in brake specific fuel consumption (BSFC). The results
showed that when engine load was 180 Nmwith the conditions of 0%e20% water emulsion ratio and 21%
e21.5% intake oxygen concentration, as well as under the condition of 100% load with 10%e15% water
emulsion ratio and 21%e22% intake oxygen concentration, the NO-Smoke emissions were lower than
that of original engine and BSFC was not exceeding 5%of the original engine by optimized combination of
water emulsion ratio and oxygen concentration.