微波辅助点火对CO_(2)稀释甲烷燃烧的影响  

Effect of microwave assisted ignition on CO_(2) diluted methane combustion

作　　者：王志豪 张新华[1] 吴慧珉 刘超辉 王兆文[1] 黄荣华[1] 李顶根[1] 王志[2] WANG Zhihao;ZHANG Xinhua;WU Huimin;LIU Chaohui;WANG Zhaowen;HUANG Ronghua;LI Dinggen;WANG Zhi(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;State Key Laboratory of Automotive Safety and Energy Efficiency,Tsinghua University,Beijing 100084,China)

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074 [2]汽车安全与节能国家重点实验室,清华大学,北京100084

出　　处：《汽车安全与节能学报》2022年第1期149-156,共8页Journal of Automotive Safety and Energy

基　　金：汽车安全与节能国家重点实验室开放基金(KF2028)。

摘　　要：为提高内燃机热效率和降低污染物排放,研究了CO_(2)稀释条件下的甲烷微波辅助点火特性。基于定容燃烧弹台架,将微波馈入到对置式电极以促进点火,采用高速纹影法探索不同试验条件下火核早期发展规律。结果表明:微波辅助点火(MAI)模式下,CO_(2)稀释极限得到提高,16%CO_(2)稀释比仍能成功点火。在8%CO_(2)稀释比时,馈入微波能将甲烷可燃极限从火花点火(SI)模式下的0.7拓展到0.6。随微波功率的升高,火核等效半径增大,但增大程度逐步减小;在不同CO_(2)稀释比条件下,微波频率对火核的增强效果出现不同规律。本研究结果可为废气再循环(EGR)氛围下应用微波辅助点火技术提供理论支撑。This paper investigated the characteristics of microwave-assisted ignition of methane under CO_(2) dilution conditions to improve the thermal efficiency of internal combustion engines and reduce the emission of pollutants.Explored that microwave was fed to the opposed electrodes to promote ignition,and the development law of early flame core under different test conditions by using high-speed schlieren method based on a constant volume combustible bomb platform.The results show that in Microwave Assisted Ignition(MAI)mode,the CO_(2) dilution limit is improved,and the 16% CO_(2) dilution ratio can still be successfully ignited.Under the condition of 8%CO_(2) dilution ratio,feeding microwave energy expands the methane ignition limit from 0.7 in the Spark Ignition(SI)mode to 0.6.With the increase of microwave power,the equivalent radius of flame core increases,but the degree of increase gradually decreases,the enhancement effect of microwave frequency on the flame core under different CO_(2) dilution ratios is different.These results can provide theoretical support for the application of microwave assisted ignition technology under Exhaust Gas Recirculation(EGR)atmosphere.

关 键 词：内燃机 微波辅助点火(MAI) CO_(2)稀释 等离子体 时间窗口 

分 类 号：U467.14[机械工程—车辆工程]