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| Effect of DME Direct Injection on the Combustion Processes of Lean Gasoline Mixture in an Engine |
| DOI：10.13949/j.cnki.nrjgc.2018.04.011 |
| Key Words:air dilution gasoline engine dimethyl ether combustion |
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| Abstract:The stable combustion of the air-diluted lean gasoline mixture was achieved with dimethyl ether(DME) direct injection in a 4 stroke single cylinder gasoline engine. Results show that the DME direct injection at 1 500 r/min and a fixed fuel low heating value in a cycle can stabilize combustion, accelerate initial flame propagation speed, shorten combustion duration and expand the upper limit of excess air coefficient(λ) in the lean burn conditions. The combination of lean burn and DME direct injection can improve engine's fuel economy under lean burn conditions. Compared to the stoichiometric mixture, the indicated specific fuel consumption can be decreased by up to 11.7%. The optimum combustion phases under different λ can be realized by changing the spark timing and the DME-to-gasoline ratio, meanwhile , the optimum heat release center will be advanced with the increase of λ. |
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