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Li D.-K.,China Automotive Engineering Research Institution | Liu S.-H.,Xian Jiaotong University | Zhu Z.,Xian Jiaotong University | Xu J.-F.,China Automotive Engineering Research Institution | Zhou J.-W.,China Automotive Engineering Research Institution
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | Year: 2013

The study on the ignition delay of dimethyl ether (DME) was conducted. An ignition delay test system was developed, which can measure the combustion pressure in the constant volume combustion bomb under different initial conditions. The ignition delay of DME was calculated and analyzed accordingly with pressure information. And a predictive correlation for the ignition delay of DME was proposed. With fuel mixtures of different cetane numbers, a correlation of cetane number and ignition delay was given which can calculate the cetane number of DME. The results indicate that DME injection pressure has little effect on its ignition delay, but initial temperature and oxygen content have significant effect. The increased density of air in the bomb shortens the ignition delay. The test results also demonstrate the shorter ignition delay of DME than diesel. The cetane number of DME is 64.8, which is larger than diesel.

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