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在一台直喷式发动机上开展了燃用柴油/碳酸二甲酯混合燃料的燃烧特性与放热过程研究.结果表明,随碳酸二甲酯含量的增加,预混燃烧推迟,扩散燃烧期缩短.在中高负荷区,相同平均有效压力下,缸内最高压力、最高压力升高率和最大放热率随碳酸二甲酯含量的增加而增加,而在低负荷区基本上不随碳酸二甲酯含量的增加而改变.着火滞燃期随碳酸二甲酯含量的增加而增加,而快速燃烧期和燃烧持续期不随碳酸二甲酯含量的变化而改变.随碳酸二甲酯含量的增加,燃油消耗率增加,等热值燃油消耗率降低.CO和烟度随碳酸二甲酯含量的增加而降低,NOx随碳酸二甲酯含量的变化,但变化不大.
In a direct injection engine, the combustion characteristics and exothermic process of diesel / DMC blend fuel were studied. The results showed that with the increase of dimethyl carbonate content, the premixed combustion was delayed and the diffusion combustion period was shortened In the medium and high load area, under the same average effective pressure, the maximum pressure, the maximum pressure rise rate and the maximum heat release rate in the cylinder increased with the increase of dimethyl carbonate content, but not with dimethyl carbonate With the increase of dimethyl carbonate content.The ignition delay increased with the increase of dimethyl carbonate content, but the rapid combustion period and combustion duration did not change with the change of dimethyl carbonate content.With the increase of dimethyl carbonate content, the fuel The consumption rate increased, and the fuel consumption rate decreased with the increase of calorific value.CO and smoke decreased with the increase of dimethyl carbonate content, while the change of NOx with dimethyl carbonate content did not change much.