Experimental Analysis on Flame Flickering of a Swirl Partially Premixed Combustion

Zhongya Xi, Zhongguang Fu, Syed Waqas Sabir, Xiaotian Hu, Yibo Jiang and Tao Zhang
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Zhongya Xi: National Thermal Power Engineering & Technology Research Center, North China Electric Power University, Beijing 102206, China
Zhongguang Fu: National Thermal Power Engineering & Technology Research Center, North China Electric Power University, Beijing 102206, China
Syed Waqas Sabir: National Thermal Power Engineering & Technology Research Center, North China Electric Power University, Beijing 102206, China
Xiaotian Hu: National Thermal Power Engineering & Technology Research Center, North China Electric Power University, Beijing 102206, China
Yibo Jiang: National Thermal Power Engineering & Technology Research Center, North China Electric Power University, Beijing 102206, China
Tao Zhang: National Thermal Power Engineering & Technology Research Center, North China Electric Power University, Beijing 102206, China

Energies, 2018, vol. 11, issue 9, 1-14

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 c v (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 , c v , 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 c v 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 .

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 (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: 2018
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