乙醇和二甲醚微射流火焰燃烧特性研究

doi:10.11949/j.issn.0438-1157.20190003

化工学报 ›› 2019, Vol. 70 ›› Issue (5): 1973-1980.DOI: 10.11949/j.issn.0438-1157.20190003

乙醇和二甲醚微射流火焰燃烧特性研究

任帅^1,⁴(),李星^1,^2,³(),张京^1,^2,³,汪小憨^1,^2,³,赵黛青^1,^2,³

1. 中国科学院广州能源研究所，广东广州 510640
2. 中国科学院可再生能源重点实验室，广东广州 510640
3. 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
4. 中国科学院大学，北京 100049

收稿日期:2019-01-03 修回日期:2019-02-11 出版日期:2019-05-05 发布日期:2019-05-05
通讯作者: 李星
作者简介:<named-content content-type="corresp-name">任帅</named-content>（1991—），男，硕士研究生，<email>renshuai@ms.giec.ac.cn</email>|李星（1984—），男，博士，副研究员，<email>lixing@ms.giec.ac.cn</email>
基金资助:
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)

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

Shuai REN^1,⁴(),Xing LI^1,^2,³(),Jing ZHANG^1,^2,³,Xiaohan WANG^1,^2,³,Daiqing ZHAO^1,^2,³

1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
2. CAS Key Laboratory of Renewable Energy, Guangzhou 510640, Guangdong, China
3. Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, Guangdong, China
4. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2019-01-03 Revised:2019-02-11 Online:2019-05-05 Published:2019-05-05
Contact: Xing LI

摘要/Abstract

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

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

中图分类号:

TK 16

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.

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.

图/表 12

图1 乙醇微射流火焰实验系统

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

图2 二甲醚供给及加热系统

Fig.2 DME supply and heating system

图3 物理模型及边界条件

Fig.3 Physic model and boundary conditions

图4 不同流速下乙醇和二甲醚微射流火焰形态

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

图5 测量的乙醇（左）和二甲醚（右）微射流火焰OH基元分布

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

图6 乙醇（左）和二甲醚（右）微射流火焰OH基元分布数值计算结果

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

图7 不同高度位置乙醇和二甲醚火焰温度沿径向分布曲线数值计算结果

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

图8 乙醇和二甲醚火焰温度和各组分分布数值计算结果（拉伸率为50 s-1）

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

图9 乙醇（a）和二甲醚（b）火焰整体反应路径

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

图10 乙醇和二甲醚主要消耗反应的反应速率曲线数值计算结果

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

图11 乙醇和二甲醚火焰温度及热释放率分布曲线数值计算结果

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

图12 乙醇和二甲醚火焰中H原子生成的数值计算结果

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

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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

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