论文部分内容阅读
本文介绍了采用高速摄影法和同步记录气缸压力示功图，对火花点火发动机爆震燃烧特性进行的实验研究。实验结果表明，爆震起因于末端混合气的自燃。爆震时末端气体急剧放热而形成压力波，导致爆震所特有的压力振荡。压力波传播速度越快，振荡频率越高，爆震也越强。压力振荡的能量主要集中在少数几个频域内，且越集中于高频区域，爆震越强。同一循环燃烧室内不同空间位置的压力状况各不相同，同一工况的不同循环间爆震的特征参数也不相同，反映了爆震时压力波传播的复杂性。因而对爆震工况进行评价时，应该考虑多个循环的综合影响。
This paper presents an experimental study of the detonation and combustion characteristics of a spark-ignition engine using high-speed photography and simultaneous recording of cylinder pressure diagrams. Experimental results show that detonation results from spontaneous combustion of the end mixture. When the end of the detonation gas exothermic heat to form a pressure wave, resulting in pressure-specific oscillation of the detonation. The faster the pressure wave propagation speed, the higher the oscillation frequency, the stronger the knock. The energy of pressure oscillation is mainly concentrated in a few frequency domains, and the more concentrated in the high frequency region, the stronger the detonation. The pressure conditions of different space positions in the same circulating combustion chamber are different, and the characteristic parameters of knocking in different cycles of the same working condition are also different, which reflects the complexity of the pressure wave propagation in the detonation. Therefore, when evaluating knocking conditions, the comprehensive effect of multiple cycles should be considered.