燃料特性和工况对直喷汽油机微粒排放的影响

摘要/Abstract

摘要：

摘要：在一台四缸增压直喷式汽油机上研究了其微粒粒径分布特性，考察了燃料属性（T90温度、乙醇添加）、发动机运行工况参数（负荷、点火时刻等）、喷射策略（喷射时刻、2次喷射）对微粒粒径分布以及微粒数目的影响规律.研究发现：T90温度对微粒排放有显著的影响，T90温度升高，微粒排放增加；增压直喷式汽油在中等负荷下的微粒排放浓度最高，在大负荷下由于轨压升高和高温排气的氧化，最大微粒排放浓度反而减小；汽油中添加10%的乙醇可以使得微粒排放适度减少；较早的喷射时刻使得燃料蒸发时间延长，混合气更加均匀，有助于减少微粒排放；而2次喷射有助于抑制微粒排放，选择合适的第2次喷射时刻，可使其抑制效果最佳；点火时刻对微粒排放影响显著，推迟点火可以减少直喷式汽油机的微粒排放.

关键词: 增压直喷式汽油机, , 微粒直径, 微粒数量, 排放, 影响因素

Abstract:

Abstract： This paper aimed to investigate the impact of fuel properties(T90 temperature and ethanol blended), engine operating parameters (load condition, spark timing etc.), and injection strategies (start of injection, split injection) on particulate size distribution and particle number. The experimental results show that T90 temperature has a significant influence on PM emission, and a low T90 temperature reduces PM emission. Particle number reaches the highest concentration at midload condition and decreases at highload because of oxidation in the high temperature exhaust and high rail pressure. E10 produces lower PM emissions. In general, advance injection timing affects fuel evaporating and mixing process and reduces PM emissions. Split injection also reduces PM emissions and can be optimized to a lower level. As the ignition timing is delayed, the formation of particles significantly is decelerated.

Key words: gasoline direct injection turbo engine, particle diameter, particle number, emission, influencing factor

中图分类号:

TK 411.5

朱小慧1,陈鹏1，方俊华2. 燃料特性和工况对直喷汽油机微粒排放的影响[J]. 上海交通大学学报（自然版）, 2017, 51(1): 69-.

ZHU Xiaohui1,CHEN Peng1,FANG Junhua2. Effects of Fuel Properties and Operation Parameters on Particle Emission of Gasoline Direct Injection Engine[J]. Journal of Shanghai Jiaotong University, 2017, 51(1): 69-.

参考文献

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