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

doi:10.11949/j.issn.0438-1157.20190003

Abstract

Abstract:

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.

Key words: microscale non-premixed flame, ethanol, dimethyl ether, flame shape, chemical reaction characteristics

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。

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

CLC Number:

TK 16

Shuai REN, Xing LI, Jing ZHANG, Xiaohan WANG, Daiqing ZHAO. Investigation on combustion characteristics of ethanol and dimethyl ether micro-jet flames[J]. CIESC Journal, 2019, 70(5): 1973-1980.

任帅, 李星, 张京, 汪小憨, 赵黛青. 乙醇和二甲醚微射流火焰燃烧特性研究[J]. 化工学报, 2019, 70(5): 1973-1980.

Figures/Tables 12

Fig. 1 Experimental system of ethanol fired micro-jet flame

Fig.2 DME supply and heating system

Fig.3 Physic model and boundary conditions

Fig. 4 Flame shapes of ethanol and DME micro-jet flames at different fuel mixture velocities

Fig.5 Measured OH distributions of ethanol (left) and DME (right) micro-jet flames at different fuel mixture flow velocities

Fig. 6 Computed OH distributions of ethanol (left) and DME (right) micro-jet flames at different fuel mixture flow velocities

Fig.7 Computed radial temperature profiles of ethanol and DME micro-jet flames at different heights

Fig.8 Computed profiles of temperature and selected species of ethanol and DME flames (at a stretch rate of 50 s-1)

Fig.9 Integrated reaction pathways of ethanol (a) and DME (b) flames

Fig.10 Computed reaction rate profiles of primary consumption reactions of ethanol and DME

Fig.11 Computed temperature and net heat release rate profiles of ethanol and DME flames

Fig.12 Computed producing rate profiles of H atom in ethanol and DME flames

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