直喷压燃式发动机燃用柴油/碳酸二甲酯的燃烧特性和放热过程研究

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。

Combustion Characteristics and Heat Release Analysis of a DI Compression Ignition Engine Fueled with Diesel-Dimethyl Carbonate Blends

Investigation on combustion characteristics and heat release analysis of a DI compression ignition engine fueled with diesel-dimethyl carbonate (DMC)blends were carried out on a compression ignition engine.The study shows that the premixed combustion is prolonged and the duration of the diffusive combustion is shortened with the increase of DMC addition.For a specific brake mean effective pressure(BMEP),the maximum cylinder gas pressure,the maximum rate of pressure rise and the maximum rate of heat release increase with the increase of DMC addition at the middle and high loads while they remains less variation with DMC addition at the small load.The ignition delay increases while the rapid combustion duration and the total combustion duration show less variation with DMC addition.Brake specific fuel consumption (BSFC) increases while diesel equivalent BSFC decreases and thermal efficiency increase with the increase of DMC addition.CO and smoke decrease with increase of DMC addition,and NOx does not increase with the increase of DMC.