Abstract
The present report is concerned with NO formation characteristics in a DI diesel engine operated with dimethyl ether (DME). Chemical equilibrium calculations were made to understand the basic NO formation properties of DME. An experimental study was also conducted with a small DI diesel engine, and the results were compared with the results of calculations using the three zone model. It was found that DME has the adiabatic flame temperature and equilibrium NO concentration which are both higher than alcohols but comparable to diesel fuel. In addition, it was suggested that the air mixing rate for DME spray is lower than that for diesel fuel and this is the cause of the relatively high NO emission when DME was used in the diesel engine.
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