【摘要】 以一台高压共轨柴油机为基础，在进气歧管处加装甲醇喷射系统，同时缸内两段直喷（预喷+主喷）煤制费托合成柴油（F-T柴油），搭建F-T柴油/甲醇（F/M）双燃料发动机试验台架，在转速为2 000 r/min，负荷为25%,50%,75%和100%的工况下分别探究甲醇替代率对发动机排放性能的影响，同时为实现F-T柴油/甲醇反应活性控制压燃模式探寻理论基础。研究结果表明：在中高负荷下，F/M双燃料发动机的燃油经济性较好；与单燃料压燃模式相比，F/M双燃料燃烧模式的HC,CO,Soot，甲醇和甲醛排放量均有所增加，且随着甲醇替代率的增大而增加，随着负荷的升高而下降；CO₂,NO_x和NO的排放量随着甲醇替代率的增大而减小，随着负荷的升高而增加；NO₂的排放量随着甲醇替代率和负荷的增大而增加。更多还原

【Abstract】 Based on a high-pressure common rail diesel engine,a methanol injection system is installed at the intake manifold.A two-stage direct injection （pre-injection+main injection） o coal-to-Fischer-Tropsch （F-T） diesel is installed in the cylinder.A two-stage injection F-T diesel/methanol （F/M） dual-fuel engine test stand is built to explore the effect of different methanol substitution rates on engine emission performance at 2 000 r/min and loads of 25%,50%,75%and 100%.Simultaneously,the theoretical basis for realizing the F-T diesel/methanol reactivity controlled compression ignition （RCCI） mode is explored.The results indicates that the fuel economy of the F/M dual-fuel engine is better at medium and high loads.The emissions of HC,CO,Soot,methanol and formaldehyde increase in the F/M dual-fuel combustion mode compared with the single-fuel compression-ignition mode.These emissions increase with the augmentationmethanol substitution rate and decrease with an increase in load.In contrast,the emissions of CO₂,NO_xand NO decrease with an increase in methanol substitution rate but increase with an increase in load.The emissions of NO₂increase with both the rise in methano substitution rate and load.The test results show that simply adding a methanol injection system to the intake manifold cannot achieve an efficient and low-emission RCCI combustion mode,and its fuel injection strategy needs to be calibrated.更多还原