作　　者： ; ; ; ;

机构地区： 长安大学汽车学院

出　　处： 《河南科技大学学报（自然科学版）》 2014年第4期22-25,30,共5页

摘　　要： 利用同步辐射真空紫外光电离结合分子束取样质谱技术,研究了当量比为1.5,燃料掺氢体积分数为0%、40%和80%的二甲醚/氢气/氧气/氩气低压层流预混火焰。测量了火焰温度曲线和火焰物种的摩尔分数分布曲线,分析了掺氢对火焰温度、燃烧主要产物CO和CO2以及主要燃烧中间物CH2O、CH3、C2H2和C2H4的影响。研究结果表明:在低压预混二甲醚/氢气/氧气/氩气火焰中,随着掺氢比的增大,火焰温度逐渐降低,火焰中CO、CO2、CH2O、CH3、C2H2和C2H4的摩尔分数逐渐减小;在后火焰区,CO与CO2的摩尔分数比随着掺氢比的增大而减小,说明掺氢有利于CO氧化成CO2,促进二甲醚完全燃烧。 Laminar premixed fuel-rich( equivalence ratio of 1. 5) dimethyl ether /hydrogen /oxygen /argon flames with different hydrogen fractions( 0%,40% and 80%) were investigated by tunable synchrotron vacuum-ultraviolet photoionization and molecular-beam mass spectrometry. The flame temperature profile and the flame species mole fraction profiles were measured. The influences of hydrogen addition on the flame temperature and mole fractions of major species and intermediates were analyzed. The results show that the flame temperature in the flame zone and the mole fraction ratios of CO to CO2 decreases with the increase of hydrogen addition,which indicates that hydrogen addition promotes the oxidation of CO to CO2 and promotes the completely combustion of dimethyl ether.

关 键 词： 二甲醚 同步辐射 层流预混燃烧 氢气 火焰结构

领　　域： [动力工程及工程热物理]