空燃比对离子电流信号的影响机理
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摘要
在一台高压定容燃烧弹上,以甲烷为燃料,研究了空燃比对离子电流信号的影响.结果表明,当过量空气系数为0.90时,离子电流信号峰值最大,峰值时刻最为提前.通过建立甲烷预混离子反应机理模型,对离子形成过程、浓度及分布情况进行了数值模拟,结果表明,化学电离发生在火焰前锋面,最主要的离子产物为H3O~+,热电离发生在焰后高温区,最主要的离子产物为NO~+.化学反应路径分析表明,当过量空气系数为0.90时,H3O~+和NO~+的净生成速率最大,浓度最高,化学电离峰和热电离峰值最大.
The effect of air/fuel ratio on ion current signal was studied with methane as the fuel in a high-pressure constant combustion vessel.The results show that the peak value of ion current signal is the highest and the peak timing is also the most advanced when the excess air ratio is 0.90.The ion formation process,concentration,and distribution were numerically simulated with the established methane ionization mechanism model.The simulation results show that chemical ionization occurs in the flame front and the main ion product is H3O~+while thermal ionization occurs in the high.Chemical reaction path analysis results indicate that when the excess air ratio is 0.90,and the neat production rate and results in the highest value of chemical ionization peak and thermal ionization peak.
The effect of air/fuel ratio on ion current signal was studied with methane as the fuel in a high-pressure constant combustion vessel.The results show that the peak value of ion current signal is the highest and the peak timing is also the most advanced when the excess air ratio is 0.90.The ion formation process,concentration,and distribution were numerically simulated with the established methane ionization mechanism model.The simulation results show that chemical ionization occurs in the flame front and the main ion product is H3O~+while thermal ionization occurs in the high.Chemical reaction path analysis results indicate that when the excess air ratio is 0.90,and the neat production rate and results in the highest value of chemical ionization peak and thermal ionization peak.
引文
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[19]SMITH G P,GOLDEN D M,FRENKLACH M,et al.GRI-Mech version 3.0[R].Berkley:Gas Research Institute,1999.
[2]AULIN H,BENTIOULIS P,TUNESTAL P,et al.Improving ion current feedback for HCCI engine control[C]∥SAE.Detroit:SAE,2007:2007-01-4053.
[3]FAN Q,BIAN J,LU H,et al.Misfire detection and reignition control by ion current signal feedback during cold start in two-stage direct-injection engines[J].International Journal of Engine Research,2014,15(1):37.
[4]童孙禹,贺孝愚,邓俊,等.增压汽油机早燃在线检测与诊断[J].同济大学学报(自然科学版),2016,44(10):1609.TONG Sunyu,HE Xiaoyu,DENG Jun,et al.Board boosted gasoline engine pre-ignition diagnostic[J].Journal of Tongji University(Natural Science),2016,44(10):1609.
[5]LIU Y,LI L,LU H,et al.In-cycle knocking detection and feedback control based on in-cylinder pressure and ion current signal in a GDI engine[C]∥SAE.Detroit:SAE,2016:2016-01-0816.
[6]髙忠权,吴筱敏,向往,等.电极结构对离子电流影响的试验研究[J].内燃机学报,2008,26(4):364.GAO Zhongquan,WU Xiaomin,XIANG Wang,et al.Experimental study on influence of electrode geometric parameters on ionization current[J].Transactions of CSICE,2008,26(4):364.
[7]高忠权,吴筱敏,魏若男,等.电极间隙对离子电流的影响研究[J].车用发动机,2008(3):79.GAO Zhongquan,WU Xiaomin,WEI Ruonan,et al.The influence research of electrode gap on ionic current[J].Vehicle Engine,2008(3):79.
[8]刘兵,李春艳,孙天旗,等.离子电流法测量CH4/H2混合气燃烧火焰传播速度的实验研究[J].西安交通大学学报,2015,49(1):40.LIU Bing,LI Chunyan,SUN Tianqi,et al.Measurement for flame speed of CH4/H2blends with ionic current method[J].Journal of Xi’an Jiaotong University,2015,49(1):40.
[9]高忠权,刘兵,李春艳,等.采用离子电流法测量火焰厚度的研究[J].燃烧科学与技术,2015(3):203.GAO Zhongquan,LIU Bing,LI Chunyan,et al.Measurement of flame thickness by ion current method[J].Journal of Combustion Science and Technology,2015(3):203.
[10]RAO R,HONNERY D.A simplified mechanism for the prediction of the ion current during methane oxidation in engine-like conditions[J].Combustion&Flame,2015,162(7):2928.
[11]ALQUAITY A B S,CHEN B,HAN J,et al.New insights into methane-oxygen ion chemistry[J].Proceedings of the Combustion Institute,2017,36(1):1213.
[12]李建文,徐正飞,刘金华,等.空燃比对离子电流信号影响的试验研究[J].车用发动机,2008(4):74.LI Jianwen,XU Zhengfei,LIU Jinhua,et al.Experimental study on the influence of air-fuel ratio on ionic current signal[J].Vehicle Engine,2008(4):74.
[13]ABDEL-REHIM A A,HENEIN N A,VANDYNE E.Impact of A/F ratio on ion current features using spark plug with negative polarity[J].SAE International Journal of Passenger Cars-Electronic and Electrical Systems,2008,1(1):432.
[14]陆海峰.新型高能点火系统开发及稀释燃烧特性基础研究[D].上海:同济大学,2017.LU Haifeng.Advanced high energy ignition system development and diluted combustion characteristics research.[D].Shanghai:Tongji University,2017.
[15]MEHRESH P,DIBBLE R W,FLOWERS D.EGR effect on ion signal in HCCI engines[J].SAE Transactions,2005,114(3):1487.
[16]MEHRESH P,SOUDER J,FLOWERS D,et al.Combustion timing in HCCI engines determined by ion-sensor:experimental and kinetic modeling[J].Proceedings of the Combustion Institute,2005,30(2):2701.
[17]BOGIN Jr G E.Characterization of ion production using gasoline,ethanol,and N-heptane in a homogeneous charge compression ignition(HCCI)engine[R].Berkley:University of California,Berkeley,2008.
[18]BUTT R H,CHEN Y,MACK J H,et al.Improving ion current of sparkplug ion sensors in HCCI combustion using sodium,potassium,and cesium acetates:experimental and numerical modeling[J].Proceedings of the Combustion Institute,2015,35(3):3107.
[19]SMITH G P,GOLDEN D M,FRENKLACH M,et al.GRI-Mech version 3.0[R].Berkley:Gas Research Institute,1999.