关键词: 火花塞；正丁醇；双火花塞；燃烧；排放；发动机性能

Abstract: Based on 3D computational fluid dynamics (CFD) simulation platform, a single cylinder model of n-butanol dual spark plug engine is established. Based on the kinetic mechanism of chemical reaction of n-butanol, three sets of different dual spark plug arrangement schemes are set up by numerical simulation to analyze the effects of dual spark plug arrangement on combustion and emission performance of engine. The research results show that neither too long nor too short distance between two spark plugs can make the engine obtain good power performance. A=0.50 scheme can obtain the highest peak value of cylinder temperature and cylinder pressure, and the highest heat release rate, the highest cumulative heat release in the early stage of combustion, and the best engine power performance at this time. Higher cylinder temperature results in the highest NOX emission and the lowest SOOT emission when A=0.50. Combined HC and CO emission results, A=0.25 have the worst emission performance, while A=0.50 and A=0.75 have comparable HC and CO emission effects.

Key words: spark plug; n-butanol; the dual spark plug; combustion; emission; engine performance