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

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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
    The College of Electrical Engineering, 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)

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.

Suggested Citation

  • Li Yang & Wubin Weng & Yanqun Zhu & Yong He & Zhihua Wang & Zhongshan Li, 2020. "Investigation of Dilution Effect on CH 4 /Air Premixed Turbulent Flame Using OH and CH 2 O Planar Laser-Induced Fluorescence," Energies, MDPI, vol. 13(2), pages 1-11, January.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:2:p:325-:d:306819
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    References listed on IDEAS

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    1. Heecheong Yoo & Bum Youl Park & Honghyun Cho & Jungsoo Park, 2019. "Performance Optimization of a Diesel Engine with a Two-Stage Turbocharging System and Dual-Loop EGR Using Multi-Objective Pareto Optimization Based on Diesel Cycle Simulation," Energies, MDPI, vol. 12(22), pages 1-26, November.
    2. Wang, Du & Ji, Changwei & Wang, Shuofeng & Meng, Hao & Yang, Jinxin, 2019. "Chemical effects of CO2 dilution on CH4 and H2 spherical flame," Energy, Elsevier, vol. 185(C), pages 316-326.
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