非平衡等离子体预处理对丙烷/空气混合气燃烧特性的影响

doi:10.16183/j.cnki.jsjtu.2022.464

摘要/Abstract

摘要：

探索在内燃机缸内压力较低时利用非平衡等离子体对缸内工质进行预处理,改善燃烧过程的可行性.在初始压力为0.1 MPa,初始温度为303 K,当量比为1的丙烷/空气混合气中,基于高频纳秒脉冲驱动沿面介质阻挡放电等离子体发生系统,在定容燃烧弹中研究不同点火间隔和放电脉冲数下非平衡等离子体预处理混合气的放电形态与能量特性及其对燃烧的影响.放电试验表明:单脉冲能量约为5.2 mJ,平均功率为30 kW;脉冲间隔80 μs的80个脉冲能产生约40个放电通道.预处理混合气试验表明:混合气经过脉冲间隔80 μs的80个脉冲处理后,燃烧持续期缩短1.33 ms,缩短了16%;随着放电脉冲数的增加,燃烧持续期先线性降低,然后趋于稳定;随着点火间隔的增大,燃烧持续期延长.

关键词: 纳秒脉冲放电, 非平衡等离子体, 燃烧控制, 沿面介质阻挡放电

Abstract:

The feasibility of using non-equilibrium plasma to pretreat in-cylinder mass at low in-cylinder pressures in internal combustion engines to improve the combustion process is explored. In a propane/air mixture with an initial pressure of 0.1 MPa, an initial temperature of 303 K, and an equivalence ratio of 1, and based on a high-frequency nanosecond pulse-driven along-surface dielectric barrier discharge plasma generation system, the morphology and energy characteristics of discharge of propane-air mixture and the effect on combustion at different ignition intervals and numbers of discharge pulse are studied in a constant-volume combustion bomb. The results of the discharge test show that the energy of a single pulse is about 5.2 mJ. The average power is 30 kW, and 80 pulses at 80 μs intervals produce approximately 40 discharge channels. When the mixture is treated with 80 pulses at 80 μs intervals, the combustion duration is reduced by 1.33 ms, which is a 16% reduction. As the number of discharge pulses increases, the burning duration first decreases linearly and then stabilizes, and the duration of combustion increases with the increasing ignition interval.

Key words: nanosecond pulse discharge, nonequilibrium plasma, combustion control, surface dielectric barrier discharge (SDBD)

中图分类号:

TK437

熊勇, 赵庆武, 刘澎, 刘静远, 程勇. 非平衡等离子体预处理对丙烷/空气混合气燃烧特性的影响[J]. 上海交通大学学报, 2024, 58(8): 1167-1178.

XIONG Yong, ZHAO Qingwu, LIU Peng, LIU Jingyuan, CHENG Yong. Effect of Non-Equilibrium Plasma Pretreatment on Combustion Characteristics of Propane/Air Mixtures[J]. Journal of Shanghai Jiao Tong University, 2024, 58(8): 1167-1178.

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