Effects of fuel injection timings and methanol split ratio in M/D/M strategy on a diesel/methanol dual-fuel direct injection engine

被引:15
|
作者
Li, Zhiyong [1 ,3 ]
Wang, Yang [2 ]
Wang, Yongjian [1 ]
Yin, Zibin [1 ]
Gao, Zhanbin [1 ]
Ye, Zixiao [1 ]
Zhen, Xudong [4 ]
机构
[1] Jimei Univ, Sch Marine Engn, Xiamen 361021, Peoples R China
[2] Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China
[3] Fujian Prov Key Lab Naval Architecture & Ocean Eng, Xiamen 361021, Peoples R China
[4] Tianjin Univ Technol & Educ, Sch Automobile & Transportat, Tianjin 3000222, Peoples R China
基金
中国国家自然科学基金;
关键词
Diesel; Methanol; Split ratio; Engine performance; Emissions; HIGH COMPRESSION RATIO; HEAVY-DUTY ENGINE; COMBUSTION CHARACTERISTICS; EMISSION CHARACTERISTICS; GASOLINE BLENDS; DIESEL-METHANOL; PERFORMANCE; RCCI; TEMPERATURE; FUMIGATION;
D O I
10.1016/j.fuel.2022.124970
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
To improve fuel economy and emissions of a diesel/methanol dual-fuel direct injection engine at high load, a methanol/diesel/methanol (M/D/M) strategy is proposed and investigated. This M/D/M strategy consists of injecting a portion of methanol in the compression stroke to form a certain concentration of premixed charge, then injecting diesel near the TDC to ignite the premixed methanol/air mixture, and finally injecting the rest methanol into the flame to achieve diffusion combustion. In this work, a numerical study is conducted to investigate the effects of fuel injection timings and methanol split ratio (SR) in the M/D/M strategy. The results show that too advanced methanol injection timing (M-SOI) leads to wall wetting while too delayed M(SOI )easily leads to knock; M-SOI-30 is the most suitable setting to avoid these undesirable outcomes. Delayed diesel injection timing (D-SOI) and large dwell can control knock intensity effectively. Moreover, increasing SR properly helps to improve fuel economy, while an excessive SR is prone to knocking. Accounting for engine performance and emissions, a SR of 50:50 paired with a M-SOI-30/D-SOI-5/M-SOI-3 setup is the best overall configuration.
引用
收藏
页数:15
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