Flame characteristics of methane/air with hydrogen addition in the micro confined combustion space
Guo, Li LU ; Zhai, Ming ; Xu, Shijie LU
; Shen, Qianhao
; Dong, Peng
and Bai, Xue Song
LU
(2022)
In International Journal of Hydrogen Energy
47(44).
p.19319-19337
- Abstract
This paper investigated methane/air flame characteristics with hydrogen addition in micro confined combustion space experimentally and computationally. The focus is on the effect of hydrogen addition on the methane/air flame stabilization, the onset of flame with repetitive extinction and ignition (FREI), and the global flame quenching in decreasing continuously combustion space. Furthermore, the effects of hydrogen addition on the flame temperature and the local equivalence ratio distribution were analyzed systematically using numerical simulations. In addition, the effects of hydrogen addition on the concentrations of OH and H radicals, and the critical scalar dissipation rate of local flame extinction were discussed. With a higher... (More)
This paper investigated methane/air flame characteristics with hydrogen addition in micro confined combustion space experimentally and computationally. The focus is on the effect of hydrogen addition on the methane/air flame stabilization, the onset of flame with repetitive extinction and ignition (FREI), and the global flame quenching in decreasing continuously combustion space. Furthermore, the effects of hydrogen addition on the flame temperature and the local equivalence ratio distribution were analyzed systematically using numerical simulations. In addition, the effects of hydrogen addition on the concentrations of OH and H radicals, and the critical scalar dissipation rate of local flame extinction were discussed. With a higher hydrogen ratio, the mixing is faster, and the flame is smaller. When the micro confined space is narrower, the heat loss to the combustor walls has a higher impact on the flames. The flames with higher hydrogen ratios have therefore lower peak flame temperatures and lower concentrations of H and OH radicals. The results show that hydrogen addition can effectively widen the stable combustion range of methane/air flames in the micro confined space by about 20% when the hydrogen addition ratio reaches 50%. The frequency and the maximum propagation velocity of FREI flames can be increased as well. The quenching distance of methane/hydrogen/air flames decreases nearly linearly with the increase of hydrogen ratio. This is attributed to the higher critical scalar dissipation rate of local flame extinction in flames with a higher hydrogen ratio.
(Less)
- author
- Guo, Li
LU
; Zhai, Ming
; Xu, Shijie
LU
; Shen, Qianhao
; Dong, Peng
and Bai, Xue Song
LU
- organization
- publishing date
- 2022-05-22
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Flame characteristics, Hydrogen addition, Methane/air flame, Micro-combustion
- in
- International Journal of Hydrogen Energy
- volume
- 47
- issue
- 44
- pages
- 19 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85129756267
- ISSN
- 0360-3199
- DOI
- 10.1016/j.ijhydene.2022.04.091
- language
- English
- LU publication?
- yes
- id
- 1e1d9d0c-fbaf-4806-b19a-d6908be24f08
- date added to LUP
- 2022-12-27 14:50:55
- date last changed
- 2023-11-07 01:07:46
@article{1e1d9d0c-fbaf-4806-b19a-d6908be24f08,
abstract = {{<p>This paper investigated methane/air flame characteristics with hydrogen addition in micro confined combustion space experimentally and computationally. The focus is on the effect of hydrogen addition on the methane/air flame stabilization, the onset of flame with repetitive extinction and ignition (FREI), and the global flame quenching in decreasing continuously combustion space. Furthermore, the effects of hydrogen addition on the flame temperature and the local equivalence ratio distribution were analyzed systematically using numerical simulations. In addition, the effects of hydrogen addition on the concentrations of OH and H radicals, and the critical scalar dissipation rate of local flame extinction were discussed. With a higher hydrogen ratio, the mixing is faster, and the flame is smaller. When the micro confined space is narrower, the heat loss to the combustor walls has a higher impact on the flames. The flames with higher hydrogen ratios have therefore lower peak flame temperatures and lower concentrations of H and OH radicals. The results show that hydrogen addition can effectively widen the stable combustion range of methane/air flames in the micro confined space by about 20% when the hydrogen addition ratio reaches 50%. The frequency and the maximum propagation velocity of FREI flames can be increased as well. The quenching distance of methane/hydrogen/air flames decreases nearly linearly with the increase of hydrogen ratio. This is attributed to the higher critical scalar dissipation rate of local flame extinction in flames with a higher hydrogen ratio.</p>}},
author = {{Guo, Li and Zhai, Ming and Xu, Shijie and Shen, Qianhao and Dong, Peng and Bai, Xue Song}},
issn = {{0360-3199}},
keywords = {{Flame characteristics; Hydrogen addition; Methane/air flame; Micro-combustion}},
language = {{eng}},
month = {{05}},
number = {{44}},
pages = {{19319--19337}},
publisher = {{Elsevier}},
series = {{International Journal of Hydrogen Energy}},
title = {{Flame characteristics of methane/air with hydrogen addition in the micro confined combustion space}},
url = {{http://dx.doi.org/10.1016/j.ijhydene.2022.04.091}},
doi = {{10.1016/j.ijhydene.2022.04.091}},
volume = {{47}},
year = {{2022}},
}