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采用带传统泵嘴供给系统的自然吸气、直喷柴油机,经改装燃用LPG/柴油混合燃料。通过与原柴油机的对比试验可知,LPG混合比为30%(L30)的混合燃料的滞燃期明显延长,最高燃烧压力和最大压力升高率降低,对应的曲轴转角滞后,最大燃烧放热率与原机基本相同,对应的曲轴转角滞后。在转速为2000r/min时,L30发动机的压力曲线出现双峰,近似于MK(modulatedkinetics)燃烧。动力性与经济性与原机基本相同,燃烧噪声降低。碳烟和NOx排放大幅下降,CO略有降低,HC排放有所升高。
Naturally aspirated, direct injection diesel engine with a traditional pump nozzle supply system modified with LPG / diesel fuel mixture. Through the comparison test with the original diesel engine, it can be seen that the ignition delay of the mixed fuel with LPG mixing ratio of 30% (L30) is obviously prolonged, the maximum combustion pressure and the maximum pressure rise rate are reduced, the corresponding crank angle hysteresis, the maximum heat release rate The same with the original machine, the corresponding crank angle hysteresis. At a speed of 2000r / min, the pressure curve of the L30 engine appears as a double peak, similar to the MK (modulatedkinetics) combustion. Power and economy are basically the same as the original machine, reducing combustion noise. Soot and NOx emissions dropped significantly, CO slightly decreased, and HC emissions increased.