Abstract
The purpose of this study is to clarify the influence of water contents and fuel injection timing of emulsified fuel on diesel engine performance. The ignitability of emulsified fuel was inferior to diesel fuel and the ignition timing of emulsified fuel which contained large amount of water delayed. Especially, the ignition timing was much delayed and the maximum combustion pressure of emulsified fuel was lower than that of diesel fuel in low load condition, however the ignition timing approached to diesel fuel and the pressure increased with an increase in brake mean effective pressure. The thermal efficiency of emulsified fuel was slightly lower than that of diesel fuel, however thermal efficiency was improved when the fuel injection timing was advanced. Therefore there is optimum fuel injection timing according to water contents. The smoke emission of emulsified fuel was lower than that of diesel fuel and decreased with increasing in water content.
