압축착화 엔진에서 DME-가솔린 혼소 운전 특성에 관한 연구

Abstract

Dual fuel combustion strategy with di-methl ether (DME) and gasoline was tested in a compression ignitionengine. Characteristics of combustion and emissions were analyzed with the variation of engine operating parameterssuch as fuel proportion, DME injection timing, intake oxygen concentration, DME injection pressure and so forth. Gasoline was injected into the intake manifold to form the homogeneous mixture with intake charge and DME wasinjected directly into the cylinder at the late compression stroke to ignite the homogeneous gasoline-air mixture. Dual fuel combustion strategy was advantageous in achievement of higher thermal efficiency and low NOx emissioncompared with DME single fuel combustion. Higher thermal efficiency was attributed to the lower heat tranfer lossfrom the decreased combustion temperature since the amount of lean premixed combustion was increased with thelarger amount of gasoline proportion. Lower NOx emissions were also possible by lowering the combustiontemperature.