为了研究生物柴油在柴油机上的应用, 在一台6缸高压共轨柴油机上进行生物柴油与汽油混合燃料的性能试验。研究结果表明:随着汽油掺混比的增加，生物柴油-汽油混合燃料的黏度、凝点和馏程温度降低，热值有所提高；在部分负荷和中等负载下，生物柴油-汽油混合燃料的峰值燃烧压力、峰值放热率和燃烧温度都会升高；在大负荷下，3种燃料的缸内压力、瞬时放热率和燃烧温度相差不大。发动机转速为1 400 r/min时，与生物柴油相比，BD90G10和BD83G17的NOx排放分别增加4.2%和6.7%，而炭烟排放量显著降低。对于超细颗粒物（D<220nm）而言，混合燃料的峰值数浓度对应的直径小于生物柴油。在低负荷和中等负荷下，汽油掺混能够有效降低超细颗粒物排放，但在大负荷下，BD90G10和BD83G17的颗粒数浓度相差不大，表明汽油掺混比的进一步增大对超细颗粒物排放的减少影响较小。

In order to study the feasibility of biodiesel applied on diesel engine, the performance test was conducted on a turbocharged in-line 6-cylinder common rail diesel engine. The results show that the viscosity, solidification point and distillation temperature of biodiesel/gasoline blended fuel decrease and the calorific value increases with the increase of gasoline blending ratio. At partial and medium loads, the peak combustion pressure, peak heat release rate and combustion temperature of biodiesel/gasoline blended fuel increase. The in-cylinder pressure, instantaneous heat release rate and combustion temperature of three fuels have little difference at high load. NOx emissions of BD90G10 and BD83G17 increase by 4.2% and 6.7% respectively and soot emission reduces significantly at 1400r/min compared with biodiesel. For ultrafine particles (D < 220 nm), the peak number concentration of mixed fuel corresponds to a smaller diameter than that of biodiesel. In addition, gasoline blending can effectively reduce the emission of ultrafine particles at low and medium loads, but the particle number concentrations of BD90G10 and BD83G17 blended fuel are almost the same at high load. Accordingly, the further increase of gasoline blending ratio has little effect on the emission reduction of ultrafine particles.