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基于定容燃烧弹研究预混层流火焰穿过孔板之后的加速过程。通过纹影法,观测到火焰之前压力锋面形成过程。分析火焰传播速率、火焰前锋结构变化、火焰加速对末端气体的影响以及从计算流体力学的角度分析了压力锋面的形成过程。结果表明,层流火焰穿过孔板会明显加速,火焰锋面之前形成清晰的压力锋面,这导致末端气体温度、压力升高,发生自燃,为小型化汽油机爆震研究提供借鉴。
Based on the constant volume combustion bomb, the acceleration process of the premixed laminar flow flame after passing through the orifice plate was studied. Through the shadowing method, the formation of the pressure front is observed before the flame. The influence of flame propagation velocity, flame front structure change, flame acceleration on the end gas and the formation process of pressure front are analyzed from the aspect of computational fluid dynamics. The results show that laminar flow flame accelerates significantly through the orifice plate and forms a clear pressure front before the flame front, which leads to the increase of temperature and pressure of the end gas and spontaneous combustion, which can be used as a reference for the study on detonation of a miniaturized gasoline engine.