进气道喷水对柴油机燃烧与排放特性影响的试验研究

Test study on influence of water injection at inlet on combustion and emission of diesel engine

在对比分析柴油掺水燃烧优缺点的基础上,笔者设计了一套喷水系统,并在4100QBZL直列增压中冷型柴油机上,采用进气道喷水的试验研究。分析了进气道不同喷水量(喷水量分别为0、0.72、1.44、2.5kg/h)对柴油机燃烧与排放特性的影响。结果表明,采用进气道喷水后,滞燃期延长,燃烧持续期缩短,缸内最大爆发压力及最大压升率上升,NO_x排放大幅减小,烟度稍有上升,CO、HC基本保持不变。

After analyzing the advantages and disadvantages of combustion of diesel mixed with water, a set of water injection system was designed. The water injection at inlet was applied and a test was conducted on 4100QBZL turbocharged diesel engine. The influence of water injection amount （it was 0, 0.72, 1.44 and 2.5 kg/h） at inlet on combustion and emission of the diesel engine was studied. The results showed that： after water injection at inlet being applied, the ignition delay duration got longer while the sustained combustion duration got shorter; the maximum explosion pressure and the maximum pressure raise rate increased; NOx emission decreased greatly while smoke emission increased slightly; CO and HC emission basically remained unchanged.