中文摘要：

用气相色谱法和傅里叶变换红外光谱法测量了燃用二甲醚（DME）的ZS195柴油机排气中的非常规污染物甲醛和甲酸甲酯的排放量，探讨了发动机结构与运转参数对非常规污染物排放的影响。测试结果表明，在非常规排放物中，甲醛是其中的主要成分，在较高转速和负荷工况，甲醛排放量随转速和负荷的变化趋势与未燃HC基本相同。在转速一定的条件下，甲醛和甲酸甲酯排放量均随喷油压力升高而减少；甲醛排放量随喷油提前角和喷孔直径的增大而下降，而甲酸甲酯排放量则随喷油提前角和喷孔直径的增大而上升。

英文摘要：

In this study, the unregulated pollutants of formaldehyde and methyl formate from a DME fueled engine are measured by the gas chromatography and the FT-IR. The effects of engine designing and operating variables on the formaldehyde and the methyl formate emissions are discussed. Experimental results show that the formaldehyde is the main component of unregulated pollutants and its behavior to engine load and speed is similar to that of unburned HC under the high load and speed condition. For a fixed engine speed, the formaldehyde and methyl formate emissions decrease with the increase of fuel injection pressure. The formaldehyde emissions decrease with the advancement of injection timing and/or the increase of nozzle diameter. However, the methyl formate emissions increase with the advancement of injection timing and/or the increase of nozzle diameter.