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Over the last few years much interest has been shown in Dimethyl Ether (DME) as a new fuel for diesel cycle engines. DME combines the advantages of a high cetane number with soot-free combustion, making it eminently suitable for compression engines. According, however, to past engine test results, the engine output of a DME engine lacking compatibility as a DME injection system, is low in comparison with a diesel engine. Required is development of a DME injection system conforming to DME properties. The purpose of this work is to investigate the feasibility of DME application for a conventional jerk-type in-line injection system that has the actual result of use of a comparatively low lubricity fuel such as methanol.

The motion and distribution of the cloud cavitation in a fuel injection pump are calculated. Numerical code consists of a set of equations in which the radial and transverse motion of bubbles are considered. The computational results examine that bubbles are trapped in the vortex and formed the bubble cloud. These results show qualitatively good agreement with experimental ones. Furthermore collapse of cloud cavitation is simulated numerically. The computational results reveal that the emitted impulsive pressure in the center of cloud exceeds a few GPa and becomes a few hundred times larger than the pressure from a single bubble collapse.