Interaction between the Microwave Plasma Generation and the Saturated Voltage during Microwave Pulse Assisted Ignition in ICE Lean Combustion  

作　　者：SUN Wei CUI Yi SONG Dawei TONG Zongpeng WU Huimin WANG Zhaowen 

机构地区：[1]The Key Laboratory for Power Machinery and Engineering of the Ministry of Education,Shanghai Jiao Tong University,Shanghai,200240,China [2]Shanghai Marine Diesel Engine Research Institute,Shanghai,200090,China [3]School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan,430074,China

出　　处：《Journal of Thermal Science》2025年第2期639-652,共14页热科学学报(英文版)

摘　　要：Microwave-assisted ignition(MAI)is a promising technology to improve the ignition stability in internal combustion engines under lean conditions.To investigate the interplay between the microwave pulses and the electrical characteristics of ignition plasma,the high-time-resolved electrical characteristics of MAI are measured based on the discharge voltage and current profiles with microwave power varying from 0 to 1000 W.The effects of microwave pulse on the electrical characteristics in the breakdown and glow discharge phases are discussed respectively.The results show that the microwave-induced-voltage-decline(MIVD)occurs during the glow discharge phase,which originates from the increment of free electrons and the additional microwave field.However,this voltage decline is insignificant in the breakdown phase.Moreover,as the free electron number reaches a critical value,a shining plasma can be observed between the gap of electrodes and the voltage decline is stabilized to a"saturated voltage curve".Ultimately,the effect of microwave plasma on the enhancement of ignition kernel area is explored.The result indicates that the enhancement effect increases with plasma duration rising.Those enhancements of earlier-generated plasmas are more significant than those of subsequent plasmas due to the distance limit of the plasma propulsive effect.

关 键 词：microwave assisted ignition electrical diagnosis saturated voltage curve microwave plasma ignition enhancement 

分 类 号：O53[理学—等离子体物理]