Abstract
In this study, unburned hydrocarbon (HC) emissions of a Premixed Compression Ignition (PCI) engine fueled with DME (Dimethyl ether) were investigated by experiment and numerical simulation. According to the results of experiment, it was shown that a considerable amount of HC emission was exhausted during the advanced injection timing, and as the injection timing was delayed, HC emission increased temporarily, and then it decreased remarkably. The volume of the piston top land and piston ring crevice effect the HC emission strongly. Both of the contribution of injection timing and the volume of the piston top land and piston ring crevice on HC emission were analyzed by simulation of mixture formation using GTT code.
