Combustion Instability of Swirl Premixed Flame with Dielectric Barrier Discharge Plasma
The effects of plasma on the combustion instability of a methane swirling premixed flame under acoustic excitation were investigated. The flame image of OH planar laser-induced fluorescence and the fluctuation of flame transfer function showed the mechanism of plasma in combustion instability. The r...
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2021-08-01
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doaj-0b8574d996eb4b478fbd86b6dd0469812021-08-26T14:16:22ZengMDPI AGProcesses2227-97172021-08-0191405140510.3390/pr9081405Combustion Instability of Swirl Premixed Flame with Dielectric Barrier Discharge PlasmaKai Deng0Shenglang Zhao1Chenyang Xue2Jinlin Hu3Yi Zhong4Yingjie Zhong5College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, ChinaCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, ChinaCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, ChinaCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, ChinaCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, ChinaCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, ChinaThe effects of plasma on the combustion instability of a methane swirling premixed flame under acoustic excitation were investigated. The flame image of OH planar laser-induced fluorescence and the fluctuation of flame transfer function showed the mechanism of plasma in combustion instability. The results show that when the acoustic frequency is less than 100 Hz, the gain in flame transfer function gradually increases with the frequency; when the acoustic frequency is 100~220 Hz, the flame transfer function shows a trend of first decreasing and then increasing with acoustic frequency. When the acoustic frequency is greater than 220 Hz, the flame transfer function gradually decreases with acoustic frequency. When the voltage exceeds the critical discharge value of 5.3 kV, the premixed gas is ionized and the heat release rate increases significantly, thereby reducing the gain in flame transfer function and enhancing flame stability. Plasma causes changes in the internal recirculation zone, compression, and curling degree of the flame, and thereby accelerates the rate of chemical reaction and leads to an increase in flame heat release rate. Eventually, the concentration of OH radicals changes, and the heat release rate changes accordingly, which ultimately changes the combustion instability of the swirling flame.https://www.mdpi.com/2227-9717/9/8/1405plasmacombustion instabilitypremixed swirl flameflame transfer functionfree radicals |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Kai Deng Shenglang Zhao Chenyang Xue Jinlin Hu Yi Zhong Yingjie Zhong |
spellingShingle |
Kai Deng Shenglang Zhao Chenyang Xue Jinlin Hu Yi Zhong Yingjie Zhong Combustion Instability of Swirl Premixed Flame with Dielectric Barrier Discharge Plasma Processes plasma combustion instability premixed swirl flame flame transfer function free radicals |
author_facet |
Kai Deng Shenglang Zhao Chenyang Xue Jinlin Hu Yi Zhong Yingjie Zhong |
author_sort |
Kai Deng |
title |
Combustion Instability of Swirl Premixed Flame with Dielectric Barrier Discharge Plasma |
title_short |
Combustion Instability of Swirl Premixed Flame with Dielectric Barrier Discharge Plasma |
title_full |
Combustion Instability of Swirl Premixed Flame with Dielectric Barrier Discharge Plasma |
title_fullStr |
Combustion Instability of Swirl Premixed Flame with Dielectric Barrier Discharge Plasma |
title_full_unstemmed |
Combustion Instability of Swirl Premixed Flame with Dielectric Barrier Discharge Plasma |
title_sort |
combustion instability of swirl premixed flame with dielectric barrier discharge plasma |
publisher |
MDPI AG |
series |
Processes |
issn |
2227-9717 |
publishDate |
2021-08-01 |
description |
The effects of plasma on the combustion instability of a methane swirling premixed flame under acoustic excitation were investigated. The flame image of OH planar laser-induced fluorescence and the fluctuation of flame transfer function showed the mechanism of plasma in combustion instability. The results show that when the acoustic frequency is less than 100 Hz, the gain in flame transfer function gradually increases with the frequency; when the acoustic frequency is 100~220 Hz, the flame transfer function shows a trend of first decreasing and then increasing with acoustic frequency. When the acoustic frequency is greater than 220 Hz, the flame transfer function gradually decreases with acoustic frequency. When the voltage exceeds the critical discharge value of 5.3 kV, the premixed gas is ionized and the heat release rate increases significantly, thereby reducing the gain in flame transfer function and enhancing flame stability. Plasma causes changes in the internal recirculation zone, compression, and curling degree of the flame, and thereby accelerates the rate of chemical reaction and leads to an increase in flame heat release rate. Eventually, the concentration of OH radicals changes, and the heat release rate changes accordingly, which ultimately changes the combustion instability of the swirling flame. |
topic |
plasma combustion instability premixed swirl flame flame transfer function free radicals |
url |
https://www.mdpi.com/2227-9717/9/8/1405 |
work_keys_str_mv |
AT kaideng combustioninstabilityofswirlpremixedflamewithdielectricbarrierdischargeplasma AT shenglangzhao combustioninstabilityofswirlpremixedflamewithdielectricbarrierdischargeplasma AT chenyangxue combustioninstabilityofswirlpremixedflamewithdielectricbarrierdischargeplasma AT jinlinhu combustioninstabilityofswirlpremixedflamewithdielectricbarrierdischargeplasma AT yizhong combustioninstabilityofswirlpremixedflamewithdielectricbarrierdischargeplasma AT yingjiezhong combustioninstabilityofswirlpremixedflamewithdielectricbarrierdischargeplasma |
_version_ |
1721190347775672320 |