An Experimental Study of the Dimethyl Ether (DME) General Spary Characteristics

This paper introduces the authors primary research results of the study of the DME spray characteristics under high fuel injection pressure.This work investigated the general nature of DME injection for engine-like conditions in a constant volume combustion chamber.With the KODAK MotionCorder Analyzer,high speed motion pictures have been obtained.The results showed that the spray penetration of the DME was slower than that of diesel fuel,and the spray angle of the DME was wider than that of the diesel fuel.Compared with the diesel fuel spray,the DME evaporated much more rapidly in the free spray development,and the influence of the ambient gas pressure to the spray characteristics seemed the same as the diesel spray.The spray penetration decreased at high ambient pressure,but the spray angle increased at the same time.Near the chamber wall and impingement spray,the spray angle of the diesel fuel spray increased very fast,but that of the DME spray almost had no significant change.