正丁醇预混合气对直喷柴油燃烧的影响  

Effects of premixed n-butanol on combustion of diesel direct injection engine

作　　者：田维 楚云路 吴学舜 何文潇 韩志强 TIAN Wei;CHU Yunlu;WU Xueshun;HE Wenxiao;HAN Zhiqiang(School of Automobile & Transportation,Xihua University,Chengdu,Sichuan 610039,China)

机构地区：[1]西华大学汽车与交通学院,四川成都610039

出　　处：《江苏大学学报（自然科学版）》2019年第2期125-131,共7页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51776177);教育部流体及动力机械省部共建重点实验室项目(SBZDPY-11-19);西华大学研究生创新基金资助项目(ycjj2018093)

摘　　要：在一台由轻型柴油机改装的正丁醇/柴油双燃料发动机上,研究了上止点附近喷射柴油条件下不同质量浓度的正丁醇预混合气对正丁醇/柴油复合燃烧及排放的影响规律.结果表明:缸内温度达到1 150～1 200 K时,正丁醇预混合气发生自燃,且自燃始点随着负荷和正丁醇喷射量的变化保持恒定;随着正丁醇喷射量的增加,燃烧持续期大幅度缩短,且放热率较高;在平均有效压力p_B≤0.50 MPa时,NO_x和soot排放均小幅度降低,HC和CO排放随正丁醇预混合气的质量浓度的增大呈线性增加;在p_B>0.78 MPa时, HC,CO和NO_x排放几乎维持在纯柴油燃烧模式排放的水平,但soot排放大幅度降低.Based on a dual fuel engine,the effects of premixed n-butanol/air mixture concentrations on n-butanol/diesel compound combustion process and emission characteristics were investigated for the injection timing at top dead center. The results show that the self-ignition happens in premixed n-butanol/air mixture before the diesel injection timing when the cylinder temperature reaches between 1 150 K and 1 200 K,and the start of self-ignition keeps constant for different load and injection quantity of n-butanol. As the injection quantity of n-butanol is increased,the combustion duration is greatly shortened with increased heat release rate. When the break mean effective pressure p B is less than or equal to 0.50 MPa,the soot and NO x emissions are lightly reduced simultaneously with the increasing of n-butanol injection quantity,while the HC and CO emissions are linearly increased. When p B is greater than 0.78 MPa,the soot emission is greatly reduced with the increasing of n-butanol injection quantity,while the NO x ,CO and HC emissions are maintained equal to that of pure diesel mode.

关 键 词：正丁醇 预混合气 自燃 排放 放热率 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]