Abstract Alcohol fuels, owing to the characteristics of oxygen-containing and high octane number, are considered as one potential alternative fuel additive in spark ignition (SI) engines. In this paper, the ethanol and n-butanol are blended with gasoline to form the new low-carbon mixed alcohols-gasoline blended fuels. The effect of different mixing proportions of ethanol and n-butanol in gasoline on knock combustion and fuel economy of SI engine was studied by experiment and simulation. The results showed that with the increase of n-butanol ratio, brake specific fuel consumption (BSFC) increase, but knock index (KI) and knock intensity decrease. Moreover, crank angle delays under the same knocking condition when the engine fueled with E5-Bx and B5-Ey fuel, and the crank angle is delayed more significantly with the increase of engine speed. In addition, when the ethanol and n-butanol are blended as the same proportion in gasoline (i.e. x = y), the KI and knock intensity of E5-Bx fuel is lower than that of B5-Ey, which indicates that the B5-Ey fuel has better antiknock property. But the BSFC of B5-Ey is slightly greater than that of E5-Bx under the same operating condition, that is, the B5-Ey fuel has higher fuel consumption.

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低碳混合醇混合比对火花点火发动机爆震燃烧的影响

摘要 酒精燃料由于具有含氧和高辛烷值的特性，被认为是火花点火（SI）发动机中一种潜在的替代燃料添加剂。本文将乙醇和正丁醇与汽油混合形成新型低碳醇-汽油混合燃料。通过实验和模拟研究了汽油中不同乙醇和正丁醇混合比例对SI发动机爆震燃烧和燃油经济性的影响。结果表明，随着正丁醇比的增加，制动比油耗（BSFC）增加，但爆震指数（KI）和爆震强度降低。此外，在相同爆震工况下，发动机使用E5-Bx和B5-Ey燃料时曲轴转角延迟，且随着发动机转速的增加曲轴转角延迟更显着。此外，当乙醇和正丁醇按相同比例掺入汽油中时（即 x = y），E5-Bx 燃料的 KI 和爆震强度低于 B5-Ey，这表明 B5- Ey燃料具有更好的抗爆性。但在相同工况下，B5-Ey 的 BSFC 略大于 E5-Bx，即 B5-Ey 燃油具有更高的油耗。