压缩比对汽油HCCI燃烧和排放特性的影响

发布时间：2018-06-04 19:06

本文选题：内燃机 + 汽油机　；参考：《内燃机工程》2016年06期

【摘要】：通过优化动力技术对一台四缸汽油机进行改造设计,实现均质混合气压燃(HCCI),考察了压缩比对汽油机HCCI负荷拓展及冷却液和进气温度对HCCI燃烧排放特性的影响。试验结果表明:提高压缩比可以在更低的进气温度下实现SI/HCCI燃烧模式的切换,CO排放升高,HC排放下降,NOx排放呈下降趋势,且在高负荷工况时下降得更加明显。在压缩比为15时,HCCI汽油发动机可以在1 200~3 600r/min转速范围内实现稳定燃烧,提高压缩比有效拓展了HCCI发动机负荷范围。随着进气温度及冷却液温度的升高,燃烧相位提前,燃烧持续期缩短,缸内压力、放热率及温度升高;缸内循环变动率减小,实现更稳定的HCCI燃烧;CO、HC排放也随之降低,但NOx排放有升高趋势。
[Abstract]:A four-cylinder gasoline engine was modified and designed by optimizing power technology to realize homogeneous mixed air pressure combustion. The effects of compression ratio on HCCI load expansion of gasoline engine and the effect of coolant and inlet temperature on the combustion characteristics of HCCI were investigated. The experimental results show that the switching of SI/HCCI combustion mode can be realized at lower inlet air temperature by increasing the compression ratio. The increase of HC emission and the decrease of no _ x emission show a decreasing trend, and the decrease is more obvious at high load condition. When the compression ratio is 15:00, HCCI gasoline engine can realize stable combustion in the range of 1 200 m3 600r/min speed, and the load range of HCCI engine can be effectively extended by increasing the compression ratio. With the increase of inlet air temperature and coolant temperature, the combustion phase is advanced, the combustion duration is shortened, the cylinder pressure, heat release rate and temperature increase, and the in-cylinder cycle variation rate decreases, and the emission of HCCI combustion becomes more stable. But NOx emissions are on the rise.
【作者单位】：上海交通大学动力机械及工程教育部重点实验室;上海汽车乘用车技术中心;
【基金】：国家“九七三”重大基础研究项目(2013CB228405)
【分类号】：TK411

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