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双卷流燃烧室与油束夹角匹配对柴油机排放的影响

DOI: 10.3969/j.issn.1006-7043.201301002

Keywords: 柴油机, 双卷流燃烧系统, 油束夹角, 排放标准, 颗粒浓度, NO??????x????浓度??

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Abstract:

为了优化喉口直径96 mm的双卷流燃烧室的排放特性,通过试验对喷油油束夹角进行匹配。选取油束夹角为155°和160°的喷油器进行试验。在外特性和部分负荷特性的试验数据显示,油束夹角为155°时,颗粒浓度比油束夹角为160°时低0.02~0.27 mg/m????3??,NO??????x????浓度比油束夹角为160°时高14×10???┆?6??~70×10???┆?6??(NO??????x????与总排气体积比的10???┆?6??)。通过试验数据解释了造成上述排放特性的原因,并运用仿真分析阐明了上述排放特性的形成机理。研究表明采用油束夹角为155°时,可以有效降低颗粒排放,若采用缸外处理NO??????x????,可以达到国4排放标准。

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