Investigation of Dilution Effect on CH 4 /Air Premixed Turbulent Flame Using OH and CH 2 O Planar Laser-Induced Fluorescence

Li Yang, Wubin Weng, Yanqun Zhu, Yong He, Zhihua Wang and Zhongshan Li
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Li Yang: Key Laboratory for Technology in Rural Water Management of Zhejiang Province, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
Wubin Weng: Division of Combustion Physics, Lund University, P.O. Box 118, S-22100 Lund, Sweden
Yanqun Zhu: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310012, China
Yong He: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310012, China
Zhihua Wang: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310012, China
Zhongshan Li: Division of Combustion Physics, Lund University, P.O. Box 118, S-22100 Lund, Sweden

Energies, 2020, vol. 13, issue 2, 1-11

Abstract: Diluting the combustion mixtures is one of the advanced approaches to reduce the NO x 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 x . The effect of N 2 /CO 2 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 2 O-PLIF. Results show that the increase of dilution ratio can sharply reduce the concentration of OH and CH 2 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 2 O in the unburned zone is less affected by different dilution gas. The CO 2 dilution has a more significant effect on OH concentration than N 2 with the given dilution ratio, but a similar effect on the concentration of CH 2 O in the preheat zone of flame. However, dilution does not have much influence on the flame structure with the given turbulent intensity.

Keywords: dilution; turbulent flame; premixed; OH; CH 2 O; planar laser-induced fluorescence (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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