摘要
利用双色激光诱导炽光法(TC-LII)测量了正戊醇/汽油层流扩散火焰中的二维碳烟体积分数分布,研究了正戊醇掺比对碳烟生成的影响.此外,构建了pentanol-TRF-PAHs半详细机理,利用CHEMKIN0-D定压模型对前驱物的路径和敏感性进行了分析.结果表明:添加正戊醇能够显著抑制碳烟生成,碳烟体积分数随正戊醇比例的增加呈近似线性下降趋势.与纯汽油相比,P20(正戊醇的体积分数为20%)、P40、P60和P80的峰值碳烟分别降低21.4%,、45.3%,、64.9%,和84.5%,.动力学分析表明:芳烃苯(A1)、萘(A2)、菲(A3)和芘(A4)的摩尔分数随正戊醇的增加而降低.添加正戊醇没有改变A1的主要生成和消耗路径.对正戊醇(P100)来说,A1通过C_3+C_3和C_4+C_2的反应生成,生成速率远小于含甲苯的燃料(P0~P80).正戊醇对碳烟的降低主要归因于芳烃稀释效应.此外,A1的生成受到了OH、HO_2、CH_3和H化学反应过程的控制,添加正戊醇后,H_2O_2、HO_2的离解反应对A1的敏感性增强.
Two-dimensional soot concentration distribution in the n-pentanol/gasoline laminar diffusion flames were measured by TC-LII technique.The effect of n-pentanol blending ratio on soot formation was investigated.The semidetailed pentanol-TRF-PAH mechanism was constructed,and the pathways and sensitivity of soot precursors were analyzed with CHEMKIN 0-D constant pressure reactor.The results show that the n-pentanol addition can significantly inhibit the soot formation.The soot concentration decrease linearly with the increasing of n-pentanol ratio.Compared with pure gasoline,the peak soot of P20,P40,P60 and P80 decreases by 21.4%,,45.3%,,64.9%,and 84.5%,respectively.The kinetic analysis shows that the mole fraction of A1-A4 decreases with the increasing of n-pentanol content.The n-pentanol addition does not change the main production and consumption pathways of A1.For the P100,A1 is generated by the reactions of C3+C3 and C4+C2,and the rate of Al formation is much smaller than that of toluene containing fuel(P0-P80).The reduction of soot by n-pentanol addition is mainly due to the dilution effect of aromatics.In addition,the A1 formation process was controlled by the chemical reaction processes of HO2,OH,CH3 and H.The sensitivity of desensitization of H2O2 and HO2 is enhanced.
作者
花阳
刘福水
吴晗
何旭
李佳峰
Hua Yang;Liu Fushui;Wu Han;He Xu;Lee Chiafon(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Collaborative Innovation Center of Electric Vehicles in Beijing,Beijing 100081,Chin;Department of Mechanical Science and Engineering,University of Illinois at Urbana-Champaign,Urbana 61801,USA)
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2018年第5期422-430,共9页
Transactions of Csice
基金
国家自然科学基金资助项目(51476011)
关键词
正戊醇
汽油
层流扩散火焰
碳烟生成
化学动力学
n-pentanol
gasoline
laminar diffusion flame
soot formation
chemical kinetics
