Study on the Effect of Flame Instability on the Flame Structural Characteristics of Hydrogen/Air Mixtures Based on the Fast Fourier Transform

Fu-Sheng Li, Guo-Xiu Li, Yan-Huan Jiang, Hong-Meng Li and Zuo-Yu Sun
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Fu-Sheng Li: School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
Guo-Xiu Li: School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
Yan-Huan Jiang: School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
Hong-Meng Li: School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
Zuo-Yu Sun: School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

Energies, 2017, vol. 10, issue 5, 1-16

Abstract: In this study, the effect of flame intrinsic instability on the flame structural characteristics of hydrogen/air mixtures premixed at various equivalence ratios were experimentally investigated from the macroscopic and microscopic perspectives, respectively. The correlation degree and the relative deformation degree were defined to quantitatively study the global flame structural characteristics. Peak detection was used to capture the characteristic length of the flame and fast Fourier transform was adopted to study the components of the fluctuation of the flame front. The results show that with the development of flames, the wrinkles in the flame front increase and the correlation degree of the flame decreases. The relative deformation degree of the flame first decreases and then increases. When the equivalence ratio is 0.6, the average characteristic length initially exhibits an increasing trend, followed by a decreasing trend. The average characteristic length scale gradually increases, and the growth rate gradually decreases when the equivalence ratio ranges from 0.70 to 0.99. With the increase in the wavenumber, the amplitude of the corresponding disturbance exhibited an increasing trend followed by a decreasing one. With the development of the flame, the maximum amplitude of the disturbance shows a reverse trend, i.e., first decreasing and then increasing. The disturbances with smaller wavelengths could be further developed.

Keywords: flame intrinsic instability; hydrogen/air; structural characteristics; equivalence ratio; fast Fourier transform (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: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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