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Energies 2018, 11(9), 2430; https://doi.org/10.3390/en11092430

Experimental Analysis on Flame Flickering of a Swirl Partially Premixed Combustion

National Thermal Power Engineering & Technology Research Center, North China Electric Power University, Beijing 102206, China
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Received: 16 August 2018 / Revised: 11 September 2018 / Accepted: 11 September 2018 / Published: 13 September 2018
(This article belongs to the Section Energy Fundamentals and Conversion)
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Abstract

An experiment was conducted to explore the flickering parameters under varying mass flow rate of fuel m ˙ F with spatial analysis and global analysis. The parameters include mean value, flickering weighted average frequency F, flickering coefficient of variation cv (firstly introduced), skewness s, and kurtosis k. From the spatial analysis, it was found that the brightest part of flame is located in its core, and the brightness gradually decreased from the inside out. The distributions of high levels of F, cv, s, and k are almost consistent, all lying in the flickering edge, which is a thin layer where the parameters sharply declined. From the global analysis, with the increment of m ˙ F, the global F decreased slightly; the global cv declined uniformly, which means the oscillation amplitude diminished and thus the flame became more stable; the global s linearly reduced; and the global k also showed a decreasing trend. The decreasing global s indicates that the number distribution gradually became symmetric, and the decreasing global k indicates that the number distribution progressively became flat. Consequently, the number distribution progressively tends to normal distribution at larger m ˙ F. View Full-Text
Keywords: flame flickering; partially premixed flame; varying mass flow rate of fuel; spatial analysis and global analysis; flickering weighted average frequency; flickering coefficient of variation; skewness and kurtosis flame flickering; partially premixed flame; varying mass flow rate of fuel; spatial analysis and global analysis; flickering weighted average frequency; flickering coefficient of variation; skewness and kurtosis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Xi, Z.; Fu, Z.; Sabir, S.W.; Hu, X.; Jiang, Y.; Zhang, T. Experimental Analysis on Flame Flickering of a Swirl Partially Premixed Combustion. Energies 2018, 11, 2430.

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