SI燃烧过程优化途径的试验和仿真研究

在快速压缩-膨胀机上通过试验和仿真手段,研究了火花塞数目、活塞运动规律、压缩比对单次循环指示功和爆震倾向的影响。研究表明:使用多火花塞点火能缩短燃烧持续期和提高指示功,但是爆震倾向明显增加;提高活塞运动速度,减少活塞在上止点附近的停留时间,可以减少爆震倾向,但是相同条件下指示功有所降低;综合使用多火花塞点火,提高活塞运行速度和采用高达17.5的压缩比,可以提高指示功并抑制爆震,使SI燃烧过程得到优化。

Experimental and Simulative Study of Optimization of Spark Ignition Combustion Process

The influence of the number of spark plugs, piston movement and compression ratio on the indicated work and detonation tendency of a rapid compression and expansion machine was studied through experiment and simulation. The results reveal that multiple spark plugs ignition can shorten the combustion duration and improve the indicated work, but the knock tendency increases obviously. The knock tendency can be reduced by increasing piston velocity to shorten the residence time of piston around top dead center, but the indicated work decreases at the same condition. The combination of the multiple spark plugs ignition with increased piston velocity and high compression ratio as high as 17.5 can improve the indicated work and suppress the knock, optimizing the spark ignition combustion process.