抄録
We experimentally evaluate a performance and exhaust emissions of a four stroke direct injection diesel engine operating on water-fuel emulsions. Two types of water emulsified fuels are produced after the suitable selection of emulsifier. The ratio of water to fuel oil was volume of 20%. We use JIS #2 Gas oil, Gas oil containing 50% volume waste food-oil (Blend 50), Blend 50 emulsified fuel whose water particulate are 12μm (Emu) and 3μm (Emu-Hi) as tested fuels. The combustion characteristics and emissions such as NO_x, CO, HC, HCHO, O_2, CO_2 and smoke, particle size distribution are compared with the case of diesel fuel. We found that (i) the CO emissions of Emu-Hi are higher than Emu especially in the low load range. (ii) the NO_x emissions of Emu-Hi are as same as Emu in the almost load range, and smoke of water-emulsified fuels are lower than Base fuel Blend 50. (iii) fuel consumptions of engine operating on water-emulsified fuels are lower than original fuel at the high load conditions.
