CIESC Journal ›› 2019, Vol. 70 ›› Issue (5): 1973-1980.doi: 10.11949/j.issn.0438-1157.20190003

• Energy and environmental engineering • Previous Articles     Next Articles

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

Shuai REN1,4(),Xing LI1,2,3(),Jing ZHANG1,2,3,Xiaohan WANG1,2,3,Daiqing ZHAO1,2,3   

  1. 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:2019-05-10
  • Contact: Xing LI E-mail:renshuai@ms.giec.ac.cn;lixing@ms.giec.ac.cn

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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

CLC Number: 

  • TK 16

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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