随着能源短缺、环境污染的日益严峻 ,研究开发新型代用燃料成为解决这一问题的主要途径之一 在内燃机中燃用掺水乳化燃油不但可以取得良好的节油效果 ,而且可以大幅度降低氮氧化物、固体颗粒物等有害物质的排放量 ,因此被视为一种降低油耗、改善排放的有效手段 但乳化油的稳定性差、在掺水量较大时难以保证柴油机的正常着火起动又是推广燃油乳化技术需要解决的问题 根据多年来国内外学者所作的研究 ,就乳化油的稳定性、节油机理、降低排放机理以及着火延迟等问题的研究现状进行综合评述 ,对今后的研究工作具有一定的参考价值 With the shortage of energy and the worsening of environmental pollution, research and development of new alternative fuels has become one of the main ways to solve this problem. Combustion of water-in-oil emulsified fuel in internal combustion engine can not only achieve good fuel-saving effect, but also greatly reduce nitrogen Oxide, particulate matter and other harmful substances emissions, it is considered as an effective means to reduce fuel consumption and improve emissions However, the stability of emulsified oil is poor, when the amount of water is difficult to ensure the normal ignition of the diesel engine is to promote fuel According to the researches made by domestic and foreign scholars over the years, a comprehensive review on the research status of emulsified oil’s stability, fuel-saving mechanism, emission reduction mechanism and ignition delay has been made on the research work in the future Reference value