李晶晶，汪春梅，彭杨茗，姚登举

(合肥工业大学 机械与汽车工程学院，安徽 合肥 230009)

摘要：将低温等离子体作为点火技术应用于汽油机，需要克服高压环境放电不均匀的限制。高压纳秒脉冲放电可在汽油机内形成大面流注通道，扩大点火空间。该文研究了高压纳秒脉冲放电等离子体辅助汽油机点火的过程。利用放电动力学模型计算了内燃机环境下燃气混合物的放电过程，得到放电产生的组分及活性自由基的信息。并借助多区模型计算了放电产生的活性自由基对汽油燃烧的影响。结果表明：放电形成的自由基O，H能明显促进汽油的燃烧，缩短点火延迟时间，对提高稀燃极限有很大潜力。

关键词：汽油机，非平衡等离子体，自由基，助燃

Abstract: The application of nanosecond pulsed low temperature plasma as an ignition technique for automotive gasoline engines needs to overcome the discharge inhomogeneity under high pressure conditions. High voltage nanosecond pulse discharge can form a large area of streamer channel, expanding the space of ignition. The paper studied the high voltage nanosecond pulse discharge plasma assisted ignition process of gasoline engines. Kinetic model for discharge was adopted to simulate the discharging process of air-fuel mixture on gasoline engines, obtaining information about active particles and radicals. Then study of combustion process assisted by plasma is carried out by kinetics solver. The results showed that  O，H radicals enhanced the combustion,  shorten ignition delay time and  provided  great potential capability to extend the lean burn limit.

 Keywords: Gasoline Engine；Non-thermal Plasma； Radical； Assisted Ignition