柴油/聚甲氧基二甲醚混合燃料的柴油机性能与排放试验

Experiments on the performances and emissions of diesel engine fuelled with diesel/polyoxymethylene dimethyl ethers blends

试验研究了燃用不同掺混比的聚甲氧基二甲醚PODE2-4混合燃料时柴油机的动力、经济和排放特性。试验在未经改动的R180柴油机上进行，转速1200、1600、2400r／min，负荷20％～100％，使用了3种混合燃料，添加PODE纠的体积百分比为5％、10％和20％。结果表明：随着PODE2。掺混比的增大，柴油机功率和转矩下降，燃油消耗率和热效率增加。当掺混比达20％时，柴油机外特性功率和转矩下降5．3％，有效燃油消耗率增加13．6％，有效热效率增加1．8％。在各种转速、负荷时，随着掺混比的增大，HC和CO排放下降，排气温度和NOx排放增加，消光系数明显下降。因此，在低比例掺混条件下，PODE州适合作为柴油的添加组分使用。

Experimental study was done on the power, economy and emissions characteristics of the diesel engine fueled with different blend ratio of PODE2.4 blend fuel. Three kinds of blend fuel with different volume ratio （5%, 10%, and 20%） were tested on a R180 diesel engine without modification, at the speed of 1 200, 1 600, 2 400 r/min and the power load of 20% to 100%. The results show that the diesel engine power and torque are decreased with the brake specific fuel consumption and the brake thermal efficiency increasing when PODE2-4 blending ratio in the blended fuel increasing. The brake specific fuel consumption is increased by 13.6%, with the brake thermal efficiency increasing an average of 1.8% while the diesel engine power and torque decreasing by an average of 5.3%, when fuel blended 20% PODE2.4. HC and CO emissions are decreased with exhaust temperature and NOx emissions increased, while extinction coefficient decreased significantly with the increase of PODE2.4 blending ratio under different loads and speeds conditions. Therefore, PODE2.4 is suit for using as diesel fuel additive component at low blending ratio.