射流控制压缩着火发动机不同负荷下燃烧及排放特性

发布时间：2018-01-30 20:56

本文关键词： 柴油机排放控制燃烧预混合　出处：《农业工程学报》2016年04期 　论文类型：期刊论文

【摘要】：针对柴油预混合气着火相位难以直接控制的问题,提出射流控制压缩着火(jet controlled compression ignition,JCCI)方式。将一台单缸农用柴油机改造为JCCI发动机:压缩比降至12,增加一个带液化石油气(liquefied petroleum gas,LPG)供给通道和火花塞的点火室,并进行了JCCI发动机全负荷特性试验研究。试验结果表明:采用射流控制压缩着火方式可以有效控制发动机的燃烧相位和排放。在平均有效压力低于0.44 MPa的工况范围,NOx排放比原机降低较多,燃烧始点相位CA10与滞燃期几乎不随负荷增加而改变;在平均有效压力高于0.44直至0.54 MPa负荷范围内,燃烧始点相位迅速前移,滞燃期迅速减小,柴油提前自燃,射流对着火相位控制作用减弱,NOx排放迅速增加并超过原机;在全负荷范围,烟度始终维持在低水平,HC和CO排放较高。该研究可为柴油预混合燃烧着火相位控制提供参考。
[Abstract]:Aiming at the problem that the ignition phase of diesel premixed gas is difficult to be controlled directly, a jet controlled compression ignition jet controlled compression ignition is proposed. JCCI. A single cylinder agricultural diesel engine was transformed into a JCCI engine: compression ratio reduced to 12. Add a ignition chamber with liquefied petroleum gas LPGs and spark plugs. The full load characteristic of JCCI engine is studied. The experimental results show that:. The combustion phase and emission of the engine can be effectively controlled by jet controlled compression ignition. The average effective pressure is less than 0. 44 MPa. The emission of NOx is much lower than that of the original engine, and the phase CA10 and the ignition lag period of the combustion start point almost do not change with the increase of the load. When the average effective pressure is higher than 0. 44 to 0. 54 MPa, the phase of the ignition point moves forward rapidly, the ignition lag period decreases rapidly, the diesel oil is self-ignited ahead of time, and the control effect of jet on the ignition phase is weakened. NOx emission increased rapidly and exceeded the original engine. In the full load range, the smoke level is always kept at a low level and the emission of HC and CO is high. This study can be used as a reference for the ignition phase control of diesel premixed combustion.
【作者单位】：中国人民解放军91550部队;大连理工大学内燃机研究所;
【基金】：国家自然科学基金资助项目(51379034)
【分类号】：TK421.2
【正文快照】： 张强,杨培源,隆武强,田江平.射流控制压缩着火发动机不同负荷下燃烧及排放特性[J].农业工程学报,2016,32(4):56-61.doi:10.11975/j.issn.1002-6819.2016.04.008 http://www.tcsae.orgZhang Qiang,Yang Peiyuan,Long Wuqiang,Tian Jiangping.Combustion and emission character

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