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.
机构:
Shaanxi Key Lab Dev & Applicat New Transportat En, Xian 710064, Peoples R ChinaShaanxi Key Lab Dev & Applicat New Transportat En, Xian 710064, Peoples R China
Li, Gang
Zhang, Chunhua
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机构:Shaanxi Key Lab Dev & Applicat New Transportat En, Xian 710064, Peoples R China
Zhang, Chunhua
Li, Yangyang
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机构:Shaanxi Key Lab Dev & Applicat New Transportat En, Xian 710064, Peoples R China
机构:
Changan Univ, Sch Automobile, Xian 710064, Peoples R China
Key Lab Shaanxi Prov Dev & Applicat New Transport, Xian 710064, Peoples R ChinaChangan Univ, Sch Automobile, Xian 710064, Peoples R China
Li, Yangyang
Chen, Huan
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Changan Univ, Sch Automobile, Xian 710064, Peoples R ChinaChangan Univ, Sch Automobile, Xian 710064, Peoples R China
Chen, Huan
Zhang, Chunhua
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Changan Univ, Sch Automobile, Xian 710064, Peoples R China
Key Lab Shaanxi Prov Dev & Applicat New Transport, Xian 710064, Peoples R ChinaChangan Univ, Sch Automobile, Xian 710064, Peoples R China
Zhang, Chunhua
Chen, Hao
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Changan Univ, Sch Automobile, Xian 710064, Peoples R China
Key Lab Shaanxi Prov Dev & Applicat New Transport, Xian 710064, Peoples R ChinaChangan Univ, Sch Automobile, Xian 710064, Peoples R China
机构:
Dalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R ChinaDalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R China
Jiang, Longlong
Xiao, Ge
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Dalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R ChinaDalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R China
Xiao, Ge
Long, Wuqiang
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Dalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R ChinaDalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R China
Long, Wuqiang
Dong, Dongsheng
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Wuhan Univ Technol, Sch Naval Architecture Ocean & Energy Power Engn, Wuhan 430000, Peoples R ChinaDalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R China
Dong, Dongsheng
Wei, Fuxing
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Dalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R ChinaDalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R China
Wei, Fuxing
Cao, Jianlin
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Dalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R ChinaDalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R China
Cao, Jianlin
Wang, Yang
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Dalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R ChinaDalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R China
Wang, Yang
Tian, Hua
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Dalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R ChinaDalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R China
机构:
Natl Res Council Canada, Energy Min & Environm Portfolio, 1200 Montreal Rd, Ottawa, ON K1A 0R6, CanadaUniv Manitoba, Dept Mech Engn, Winnipeg, MB R3T 5V6, Canada