The impact of fuel composition on the emission performance and combustion characteristics for partially premixed combustion (PPC) were examined for four fuels in the gasoline boiling range together with Swedish diesel MK1. Experiments were carried out at 8 bar IMEP_g and 1500 rpm with 53±1% EGR and λ= 1.5. This relation gave inlet mole fractions of approximately 5% CO_2 and 13% O_2. The combustion phasing was adjusted by means of start of injection (SOI), for all fuels, over the range with stable combustion and acceptable pressure rise rate combined with maintained X, EGR ratio, inlet pressure, and load. The operating range was limited by combustion instability for the high RON fuels, while MK.1 and the low RON fuels could be operated over the whole MBT plateau. The largest difference in engine-out emissions between the fuels was the filtered smoke number (FSN), as the gasoline fuels produced a much lower FSN value than MK1. Higher RON value gave higher levels of carbon monoxide (CO) and unburned hydrocarbon (HC) for the gasoline fuels, while MK.1 had the lowest levels of these emissions.
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机译：在汽油沸程范围内的四种燃料以及瑞典柴油MK1中，研究了燃料成分对部分预混燃烧（PPC）排放性能和燃烧特性的影响。实验是在8 bar IMEP_g和1500 rpm下进行的，其中EGR为53±1％，λ= 1.5。该关系给出了大约5％的CO 2和13％的O 2的入口摩尔分数。通过喷射开始（SOI）在所有燃烧范围内，通过稳定的燃烧和可接受的压力上升速率，并保持X，EGR比，进气压力和负载，调整燃烧阶段。高RON燃料的燃烧不稳定性限制了运行范围，而MK.1和低RON燃料可以在整个MBT平稳期运行。燃料之间的发动机输出排放物最大的区别在于过滤后的烟气值（FSN），因为汽油燃料产生的FSN值远低于MK1。 RON值越高，汽油燃料中的一氧化碳（CO）和未燃烧的烃（HC）含量越高，而MK.1的排放量最低。
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