乙醇和二甲醚微射流火焰燃烧特性研究  

Investigation on combustion characteristics of ethanol and dimethyl ether micro-jet flames

作　　者：任帅 李星 张京[1,3,4] 汪小憨[1,3,4] 赵黛青[1,3,4] REN Shuai;LI Xing;ZHANG Jing;WANG Xiaohan;ZHAO Daiqing(Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China;CAS Key Laboratory of Renewable Energy, Guangzhou 510640, Guangdong, China;Guangdong Provincial Key Laboratory of Newand Renewable Energy Research and Development, Guangzhou 510640, Guangdong, China;University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]中国科学院广州能源研究所,广东广州510640 [2]中国科学院大学,北京100049 [3]中国科学院可再生能源重点实验室,广东广州510640 [4]广东省新能源和可再生能源研究开发与应用重点实验室,广东广州510640

出　　处：《化工学报》2019年第5期1973-1980,I0003,共9页CIESC Journal

基　　金：国家自然科学基金项目(51336010;51506204);国家重点研究发展计划项目(2018YFB1501500);中国科学院先导专项(XDA 21060102)

摘　　要：采用实验及数值计算研究了乙醇和二甲醚微圆管射流火焰燃烧特性。通过实验观察到不同燃料流速下乙醇和二甲醚火焰都具有四种典型的火焰形态;使用平面激光诱导荧光测试系统获得了微射流火焰的OH基元分布,实验结果表明在较高流速下稳定燃烧的乙醇火焰比二甲醚火焰直径小,且略高于二甲醚火焰;采用考虑详细化学反应机理的数值计算对乙醇和二甲醚火焰进行了数值模拟,计算结果与实验现象吻合较好;利用一维非预混对冲火焰计算进一步研究了这两种燃料的化学反应路径,分析结果表明乙醇和二甲醚火焰的中间产物有显著差异,两种燃料化学反应特性的差异导致了不同的微火焰结构。Combustion characteristics of ethanol and dimethyl ether (DME) micro-jet flames were investigated experimentally and numerically. Four typical flames were observed in experiments of both ethanol flames and DME flames. The OH distributions of micro-jet flames were obtained by using OH-Planar Laser Induced Fluorescence (OH-PLIF) measuring system, the results showed that stable ethanol flames at relatively high velocities have smaller diameter and are slightly higher than counterparts of DME flames. Numerical simulation of ethanol and DME micro-jet flames were performed by numerical computations with a detailed chemical reaction mechanism, and the computed results agreed well with the experimental results. Reaction flux analyses of these two fuels were also performed with numerical calculation of one-dimensional non-premixed counterflow flame, which showed that there is a significant difference in intermediate species between the ethanol and DME flames. And the difference in chemical reaction characteristics leads to the difference in the flame structure of these two fuels.

关 键 词：微尺度非预混火焰 乙醇 二甲醚 火焰形态 化学反应特性 

分 类 号：TK16[动力工程及工程热物理—热能工程]