直喷式柴油机燃用生物柴油的性能与排放

为了研究生物柴油在柴油机上的应用,在一台四缸涡轮增压直喷式柴油机上进行不同掺混比生物柴油与柴油混合燃料的性能对比试验,分析了在不同转速和负荷下柴油机燃用不同掺混比混合燃料的动力性、经济性和排放特性。研究结果表明:生物柴油与柴油相比,在2 200 r/min负荷特性下,有效能耗率减少,NOx排放增加较多,中小负荷碳烟排放基本相同,大负荷碳烟排放明显降低,中小负荷HC排放明显降低,大负荷HC排放基本一致,CO排放基本不变;在外特性下,功率略有增加,HC排放和碳烟排放均有所降低,CO排放和NOx排放增加。

Performances and emissions of direct injection diesel engine fuelled with biodiesel-diesel mixed fuel

To study the application of biodiesel to diesel engines,the performance tests of a four cylinder turbocharged direct injection diesel engine fuelled by biodiesel-diesel mixed fuel with different mixing ratios are conducted,and its power outputs,fuel economies and emissions are measured and compared with the one of diesel operation.The results indicate that: when the load is 2 200 r/min,the effective specific energy consumption decreases,NOx emission increases;smoke emission decreases at high load and keeps almost no change at low and middle loads;HC emission decreases at low and middle loads and keeps the same at high loads,and CO emission maintains the same;at full load characteristics,the power output increases slightly,HC and smoke emissions decrease,CO and NOx emissions increase.10 figs,11 refs.