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首页> 外文期刊>Combustion and Flame >Experimental study on sooting propensities of ternary blends of n-dodecane, isododecane, and C8 oxygenates at high pressures
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Experimental study on sooting propensities of ternary blends of n-dodecane, isododecane, and C8 oxygenates at high pressures

机译：Experimental study on sooting propensities of ternary blends of n-dodecane, isododecane, and C8 oxygenates at high pressures

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The use of liquid fuels in internal combustion engines is still prevalent in society because of their highenergy density, ease of handling, and matured engine technology. Along with other power generationsectors, the transport sector faces the need to reduce emissions such as soot. One option to address thisis to use oxygen-bearing fuels. The presence of oxygenated compounds in fuels have the potential to reducesoot emissions in heavy duty diesel engines and various power generation sectors. Understandingthe fundamental combustion and sooting characteristics of oxygenated compounds at high pressures isessential for the development of future low sooting fuels. In this work, four oxygenated compounds belongingto the C8 functional group were deployed along with normal dodecane and isododecane to formternary blends having the same oxygen content, of 2.5 by mass, and a matching cetane number of 52.The blends were injected at a high pressure into controlled high pressure, high temperature conditionsin a constant volume chamber. The flame and the soot natural luminosity were investigated with highspeeddiagnostics. The results revealed that the blends delayed the onset of the first appearance of soot.The presence of oxygenates increased the soot lift-off length by 40, hindered the formation of soot byup to 55, and enhanced the oxidation by up to 10, all relative to diesel. The sooting tendency of theoxygenated blends increased in the order of ketone ≈ alcohol < ester < aldehyde < diesel. The differencebetween the sooting tendencies of the oxygenates was smaller than those between the oxygenates anddiesel, showing that soot reduction was mostly due to oxygen content and dilution effects. However, thesmall differences observed between the oxygenates indicates that the moiety does have an effect on sootreduction—but to a lesser extent than dilution and oxygen effects.

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