乙烯预混火焰中乙醇添加对碳烟生长的影响  

Effect of Ethanol on the Process of Soot Formation in Ethylene Premixed Flames

作　　者：李松[1,2] 魏明锐[1,2] 刘近平[1,2] 彭飞[1,2] 

机构地区：[1]武汉理工大学现代汽车零部件技术湖北省重点实验室,湖北武汉430070 [2]武汉理工大学汽车零部件技术湖北省协同创新中心,湖北武汉430070

出　　处：《内燃机学报》2016年第3期239-245,共7页Transactions of Csice

基　　金：国家自然科学基金资助项目(51176136);中央高校基本科研业务费专项资金资助项目(145207002;2015Ⅲ040)

摘　　要：基于颗粒群平衡理论,构建了详细的碳烟模型,采用Monte-Carlo算法进行数值求解,结合详细的化学反应机理,对乙烯/乙醇/空气层流预混火焰中碳烟的生成进行了研究.通过计算对比了不同比例乙醇(0、10%、20%和30%)添加对碳烟颗粒生成过程的影响,获得了不同火焰高度下碳烟体积分数和尺寸分布等信息.结果表明:乙醇的添加增强了火焰中碳烟前驱物和碳烟颗粒的氧化反应,有效抑制了碳烟的生成;随着乙醇添加量的增加,颗粒尺寸分布的双峰结构越不明显,第2峰值往前推移.A detailed soot model was built on the basis of particles population balance theory,combined with detailed kinetic mechanism.Monte-Carlo method was used to solve this model,and soot formation in the premixed ethylene/ethanol/air flame was investigated.The effects of ethanol addition on soot formation in four flames were calculated with ethanol percentages of 0,10%,20%,and 30%,respectively.Soot volume fraction and particle size distribution function(PSDF)at different HAB were obtained.Results show that the soot precursor and soot oxidation are intensified with ethanol,thus soot formation is suppressed.The bimodal of PSDF is unobvious with the increase of ethanol addition,and the second modal moves forward.

关 键 词：乙烯 乙醇 预混火焰 碳烟 颗粒尺寸分布 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]