中文摘要：

试验用生物油是玉米秸秆快速热解液化的产物,主要成分为含氧有机混合物和水,不宜直接作为燃料使用,但与柴油乳化后可实现其在发动机中应用。在一台未作改动的直喷式柴油机上研究了玉米秸秆生物油质量分数分别为10%（B10）和20%（B20）的生物油柴油乳化油的燃烧特性。结果表明：与0号柴油相比,乳化油的滞燃期延长,预混燃烧放热峰值和最大压力升高率升高,扩散燃烧放热峰值略低,最高燃烧压力和缸内气体平均温度降低,燃烧持续期缩短。与B10相比,B20的滞燃期延长,而预混燃烧放热峰值、最大压力升高率、最高燃烧压及缸内气体平均温度均较低。燃用B10时的燃油经济性与0号柴油相当,而燃用B20时的燃油经济性较0号柴油的差。

英文摘要：

The experimental bio-oil produced from corn stalk through fast pyrolysis process is mainly composed of oxygenated organic and water,thereby restricting its direct use as fuel.However,the use of bio-oil in diesel engines can be realized by developing emulsions from bio-oil and diesel fuel.In this paper,two emulsions with 10%and 20%by mass fraction of bio-oil in diesel fuel,represented by B10 and B20 respectively,were prepared by using ultrasonic emulsihcation method.Then,the combustion characteristics of an unmodified direct injection diesel engine operating on the two emulsions were studied.The results show that the engine operating on the two emulsions displays a longer ignition delay,exhibits a higher peak value of premixed burning rate and pressure rise rate and a slightly lower peak value of diffusion burning rate,displays a lower peak combustion pressure and average combustion temperature,and has a shorter combustion duration when compared with No.0 diesel.In comparison with B10,B20 has a longer ignition delay,while exhibits a lower peak value of premixed burning rate,pressure rise rate,in-cylinder pressure and combustion temperature.In addition,the fuel economy for B10 operation is comparable to that for No.0 diesel operation,while the fuel economy of B20 is poorer than that of No.0 diesel.