Abstract
Dimethyl ether (DME) - diesel dual fuel combustion has shown the potential in reducing nitrogen monoxide and improving the engine performance compared to diesel operation. This study is an investigation of dual fuel with diesel and DME Port Fuel Injection (PFI) on pilot fuel injection using a common rail diesel engine. The main injection timing was at 20 degrees of crank angle before top dead center. In addition, the pilot fuel injector timing before the main injection was 10 degrees of crank angle, with only 0.5 milliseconds of time. The common rail engine is operated with 0 - 70% DME compared with main fuel. The main finding shows that the combustion of 10%DME emitted low nitrogen monoxide content and enhanced thermal efficiency compared with only pilot fuel injection. However, the higher ratio of DME port fuel injection is affected to the increasing of nitrogen monoxide, carbon monoxide and hydrocarbon content. In additions, DME port injection of 50% reduced the diesel fuel consumption up to 32.17 %.
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