Effects of Advancing the Pilot Injection Timing on The Engine Performance,Combustion and Emissions on Diesel dual fuel Engine at High Load

摘要

Pilot injection timing is a very important parameter at the start of ignition which will affect engine performance and emissions on diesel dual-fuel engines,especially at high loads.This research was carried out on the Diamond DI 800 diesel engine,a single-cylinder that was modified into a dual fuel engine with the aim to determine the effect of advancing the pilot injection timing(PIT)on engine performance,combustion and emissions under high loads with variation pilot injection timing(11°,13°,15°,17° and 19° BTDC).The cylinder pressure,heat release rate(HRR),combustion duration,ignition delay,power,SFC and brake thermal efficiency(BTE),as well as carbon monoxide(CO),hydrocarbon(HC)and particulate matter emissions,were analyzed.The results showed that advancing the pilot injection timing increased the maximum cylinder pressure by 69.52 bar;the heat release rate was 117.79 kJ/m~3/°CA,brake thermal efficiency was 25.17% and significantly reduced HC,CO and PM emissions at the pilot injection timing 17° BTDC.Improved combustion performance occurs when the combustion duration is reduced even though the ignition delay period occurs by adding pilot injection timing under high load.