柴油/二甲醚双燃料发动机的排放性能研究

摘要

In order to investigate the influence of different blending ratio of diesel and dimethyl ether on exhaust emissions of the engine, the AVL FIRE software was employed to simulate the combustion process of different blending ratio of diesel and dimethyl ether. The results show that as the blending ratio of dimethyl ether increases, the average in-cylinder temperature will decline. Therefore, the NO and Soot formation are restrained, but it will lead to a decline of power performance. The results provide theoretic guidance to make certain the blending ratio of diesel and dimethyl ether of engine.%为研究不同二甲醚掺混比对柴油/二甲醚双燃料发动机排放水平的影响，运用AVL FIRE软件对不同掺混比下的燃烧过程进行了三维数值模拟计算。研究结果表明，由于柴油与二甲醚燃料性质的差异，随着二甲醚掺混比的增加，缸内平均气体温度逐渐下降，从而抑制了NO和碳烟排放物的生成，但会导致发动机动力性能的下降，计算结果为合理的确定二甲醚的掺混比提供了依据。