论文部分内容阅读
在一台电控高压共轨涡轮增压直喷式柴油机上,进行了不同工况和不同喷油定时下燃用纯柴油与不同掺混比例异丙醇柴油(5%、10%、15%、20%v/v)混合燃料的性能试验。结果表明:随着异丙醇掺混比例增大,预喷燃烧的缸内压力峰值与放热率峰值降低,主喷燃烧的缸内压力峰值与放热率峰值升高,有效燃油消耗率升高,中高负荷时的当量燃油消耗率降低,CO排放降低,THC和NOx排放升高,碳烟排放明显降低。在相同工况下,随着喷油定时提前,预喷与主喷燃烧的放热率中心均提前,前者的放热率峰值和缸内压力峰值降低,后者的则升高,有效燃油消耗率和当量燃油消耗率降低,CO与THC排放降低,NOx排放升高,碳烟排放降低。喷油定时为2°CA ATDC,掺混20%的异丙醇时,碳烟排放较纯柴油降低比例可达83%。
In an electronically controlled high pressure common rail turbocharged direct injection diesel engine, under different operating conditions and different injection timing, pure diesel with different proportions of isopropanol diesel (5%, 10%, 15% , 20% v / v) mixed fuel performance test. The results show that with the increasing proportion of isopropanol, the peak pressure and heat release rate of pre-injection combustion decrease, the peak pressure and heat release rate of main combustion increase, the effective fuel consumption rate increases Lower equivalent fuel consumption at high and medium loads, lower CO emissions, higher THC and NOx emissions, and significantly lower soot emissions. In the same conditions, with the injection timing ahead of the pre-injection and the main jet combustion heat rate center are advanced, the former peak heat release rate and peak pressure drop in the cylinder, while the latter increases, the effective fuel consumption The rate and equivalent fuel consumption rate is reduced, CO and THC emissions are reduced, NOx emissions are increased, and soot emissions are reduced. The injection timing was 2 ° CA ATDC. When 20% isopropanol was blended, soot emission was reduced by 83% over pure diesel.