35 Engine Performance of the Small Compression Ignition Engine with DME Low Pressure Injection 2002-32-1804
In the research of DME compression ignition engine, there are a lot of reports on the high fuel pressure systems which are used in the common-rail fuel injector and others for the DME mixture formation promotion. However, the initial development-cost of these fuel supply systems will be increased for small compression ignition engines. On the other hand, it has been understood that excellent thermal efficiency of DME compression ignition engine was obtained at the appropriate fuel injection timing by using the electronic controlled injector with low pressure injection. In this paper, the stabilization of combustion on DME compression ignition engine with low pressure injection was investigated for the influence of the fuel pressure and the combustion assistance with homogeneous charge. As the result, it was clarified that the fuel mixture formation was promoted due to the active contact between the fuel molecules and the oxygen molecules, because of the reinforcement of the fuel penetration and the increase of the stir actions which included the turbulance of combustion and swirl flow.