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Experimental Investigation on DME Assisted Gasoline CAI/HCCI Combustion with Intake Re-Breathing Valve Strategy
Technical Paper
2015-01-1818
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In order to investigate feasibility of DME (Di-methyl ether) assisted gasoline CAI (controlled-auto ignition) combustion, direct DME injection is employed to act as the ignition source to trigger the auto-ignition combustion of premixed gasoline/air mixture with high temperature exhaust gas. Intake re-breathing valve strategy is adopted to obtain internal exhaust recirculation (EGR) that regulates heat release rate and ignitability of the premixed gasoline and air mixture. The effects of intake re-breathing valve timing and 2nd DME injection timing of different split injection ratios were investigated and discussed in terms of combustion characteristics, emission and efficiencies. The analyses showed that re-breathing intake valve timing had a large effect on the operation range of CAI combustion due to EGR and intake temperature variation. The results of 2nd DME injection timing on various 1st / 2nd DME injection ratio indicated that the optimized 2nd DME injection timing depends on 1st / 2nd DME injection ratio. As1st DME injection ratio was increased, more retarded 2nd DME injection timing was required.
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Citation
Seo, K. and Zhao, H., "Experimental Investigation on DME Assisted Gasoline CAI/HCCI Combustion with Intake Re-Breathing Valve Strategy," SAE Technical Paper 2015-01-1818, 2015, https://doi.org/10.4271/2015-01-1818.Also In
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