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Investigation of dilution effect on CH4/air premixed turbulent flame using OH and CH2O planar laser-induced fluorescence

Yang, Li ; Weng, Wubin LU ; Zhu, Yanqun ; He, Yong ; Wang, Zhihua and Li, Zhongshan LU (2020) In Energies 13(2).
Abstract

Diluting the combustion mixtures is one of the advanced approaches to reduce the NOx emission of methane/air premixed turbulent flame, especially with high diluents to create a distributed reaction zone and mild combustion, which can lower the temperature of reaction zone and reduce the formation of NOx. The effect of N2/CO2 dilution on the combustion characteristics of methane/air premixed turbulent flame with different dilution ratio and different exit Reynolds number was conducted by OH-PLIF and CH2O-PLIF. Results show that the increase of dilution ratio can sharply reduce the concentration of OH and CH2O, and postpone the burning of fuel. Compared with the ultra-lean... (More)

Diluting the combustion mixtures is one of the advanced approaches to reduce the NOx emission of methane/air premixed turbulent flame, especially with high diluents to create a distributed reaction zone and mild combustion, which can lower the temperature of reaction zone and reduce the formation of NOx. The effect of N2/CO2 dilution on the combustion characteristics of methane/air premixed turbulent flame with different dilution ratio and different exit Reynolds number was conducted by OH-PLIF and CH2O-PLIF. Results show that the increase of dilution ratio can sharply reduce the concentration of OH and CH2O, and postpone the burning of fuel. Compared with the ultra-lean combustion, the dilution weakens the combustion more obviously. For different dilution gases, the concentration of OH in the combustion zone varies greatly, while the concentration of CH2O in the unburned zone is less affected by different dilution gas. The CO2 dilution has a more significant effect on OH concentration than N2 with the given dilution ratio, but a similar effect on the concentration of CH2O in the preheat zone of flame. However, dilution does not have much influence on the flame structure with the given turbulent intensity.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CHO, Dilution, OH, Planar laser-induced fluorescence, Premixed, Turbulent flame
in
Energies
volume
13
issue
2
article number
325
publisher
MDPI AG
external identifiers
  • scopus:85077814689
ISSN
1996-1073
DOI
10.3390/en13020325
language
English
LU publication?
yes
id
54359be0-59e1-4c01-b007-262bbdbf89e7
date added to LUP
2020-01-29 15:16:46
date last changed
2022-04-18 20:10:29
@article{54359be0-59e1-4c01-b007-262bbdbf89e7,
  abstract     = {{<p>Diluting the combustion mixtures is one of the advanced approaches to reduce the NO<sub>x</sub> emission of methane/air premixed turbulent flame, especially with high diluents to create a distributed reaction zone and mild combustion, which can lower the temperature of reaction zone and reduce the formation of NO<sub>x</sub>. The effect of N<sub>2</sub>/CO<sub>2</sub> dilution on the combustion characteristics of methane/air premixed turbulent flame with different dilution ratio and different exit Reynolds number was conducted by OH-PLIF and CH<sub>2</sub>O-PLIF. Results show that the increase of dilution ratio can sharply reduce the concentration of OH and CH<sub>2</sub>O, and postpone the burning of fuel. Compared with the ultra-lean combustion, the dilution weakens the combustion more obviously. For different dilution gases, the concentration of OH in the combustion zone varies greatly, while the concentration of CH<sub>2</sub>O in the unburned zone is less affected by different dilution gas. The CO<sub>2</sub> dilution has a more significant effect on OH concentration than N<sub>2</sub> with the given dilution ratio, but a similar effect on the concentration of CH<sub>2</sub>O in the preheat zone of flame. However, dilution does not have much influence on the flame structure with the given turbulent intensity.</p>}},
  author       = {{Yang, Li and Weng, Wubin and Zhu, Yanqun and He, Yong and Wang, Zhihua and Li, Zhongshan}},
  issn         = {{1996-1073}},
  keywords     = {{CHO; Dilution; OH; Planar laser-induced fluorescence; Premixed; Turbulent flame}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{2}},
  publisher    = {{MDPI AG}},
  series       = {{Energies}},
  title        = {{Investigation of dilution effect on CH<sub>4</sub>/air premixed turbulent flame using OH and CH<sub>2</sub>O planar laser-induced fluorescence}},
  url          = {{http://dx.doi.org/10.3390/en13020325}},
  doi          = {{10.3390/en13020325}},
  volume       = {{13}},
  year         = {{2020}},
}