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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Fu-Sheng Li & Guo-Xiu Li & Yan-Huan Jiang & Hong-Meng Li & Zuo-Yu Sun, 2017. "Study on the Effect of Flame Instability on the Flame Structural Characteristics of Hydrogen/Air Mixtures Based on the Fast Fourier Transform," Energies, MDPI, vol. 10(5), pages 1-16, May.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:5:p:678-:d:98494
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    References listed on IDEAS

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    1. Zuo-Yu Sun & Guo-Xiu Li & Hong-Meng Li & Yue Zhai & Zi-Hang Zhou, 2014. "Buoyant Unstable Behavior of Initially Spherical Lean Hydrogen-Air Premixed Flames," Energies, MDPI, vol. 7(8), pages 1-19, July.
    2. Yang, Kai & Zhang, Hongguang & Wang, Zhen & Zhang, Jian & Yang, Fubin & Wang, Enhua & Yao, Baofeng, 2013. "Study of zeotropic mixtures of ORC (organic Rankine cycle) under engine various operating conditions," Energy, Elsevier, vol. 58(C), pages 494-510.
    3. Askari, Omid & Elia, Mimmo & Ferrari, Matthew & Metghalchi, Hameed, 2017. "Cell formation effects on the burning speeds and flame front area of synthetic gas at high pressures and temperatures," Applied Energy, Elsevier, vol. 189(C), pages 568-577.
    4. Sun, Zuo-Yu & Li, Guo-Xiu, 2015. "On reliability and flexibility of sustainable energy application route for vehicles in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 51(C), pages 830-846.
    5. Li, Hong-Meng & Li, Guo-Xiu & Sun, Zuo-Yu & Zhou, Zi-Hang & Li, Yuan & Yuan, Ye, 2016. "Investigation on dilution effect on laminar burning velocity of syngas premixed flames," Energy, Elsevier, vol. 112(C), pages 146-152.
    6. Sun, Zuo-Yu & Li, Guo-Xiu, 2016. "Propagation characteristics of laminar spherical flames within homogeneous hydrogen-air mixtures," Energy, Elsevier, vol. 116(P1), pages 116-127.
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    Cited by:

    1. Santiago Martinez & Adrian Irimescu & Simona Silvia Merola & Pedro Lacava & Pedro Curto-Riso, 2017. "Flame Front Propagation in an Optical GDI Engine under Stoichiometric and Lean Burn Conditions," Energies, MDPI, vol. 10(9), pages 1-23, September.
    2. Li, Hong-Meng & Li, Guo-Xiu & Jiang, Yan-Huan & Li, Lei & Li, Fu-Sheng, 2018. "Flame stability and propagation characteristics for combustion in air for an equimolar mixture of hydrogen and carbon monoxide in turbulent conditions," Energy, Elsevier, vol. 157(C), pages 76-86.

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