乙醇和二甲醚预混火焰燃烧过程的计算与分析  

Calculation and analysis of combustion process for ethanol and DME premix flames

作　　者：李立琳[1,2] 王忠[1] 李铭迪[1] 陈林[1] 许广举[1] 

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013 [2]河南工程学院机械工程系,河南郑州450000

出　　处：《江苏大学学报（自然科学版）》2012年第4期396-401,共6页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省高校自然科学重大基础研究项目(08KJA470001);江苏高校优势学科建设工程项目(2011PAPD);河南省教育厅自然科学研究重点项目(12A470001)

摘　　要：运用CHEMKIN中的低压预混火焰模型,针对相同组分、不同官能团的乙醇和二甲醚,在摩尔质量相同时模拟了燃烧化学变化过程,比较了两者中间产物及OH,H,O自由基的差异;利用生成速率和敏感性分析方法,探讨了乙醇和二甲醚消耗反应的化学变化过程,并对燃烧产物乙烯和甲醛进行了敏感性分析.结果表明:不同官能团对燃料的燃烧及污染物形成有较大的影响;以氮气为载体,相同火焰高度下,二甲醚的反应速率大于乙醇的反应速率,二甲醚燃烧产生的OH,H,O自由基摩尔分数均大于乙醇;二甲醚燃烧生成的乙烯少于乙醇,甲醛多于乙醇,C—C键的断裂与重组是造成两者污染物差异的主要原因.According to the low-pressure premix flame CHEMKIN model,the chemical change of combustion process was simulated for the same quantity of ethanol and dimethyl ether which have different functional group with same molecular formula.The intermediaries and the difference of OH,H,O radicals were compared.The chemical change of consumption process of ethanol and dimethyl ether were investigated by rate-of-production and sensitivity analysis.The sensitive analysis to the combustion product of ethylene and the formaldehyde were also investigated.The results indicate that functional group has tremendous influence on the formation of fuel combustion and pollutant.With carrier gas of nitrogen for same flame altitude,the reaction rate of dimethyl ether is bigger than that of ethanol with more quantitative product of OH,H,O radicals than those of ethanol.The combustion product of ethylene for dimethyl ether is less than that for ethanol,while the situation is the opposite for formaldehyde product.The main reason is the bond-break and re-bond of C—C bond.

关 键 词：乙醇 二甲醚 预混火焰 污染物 数值模拟 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]