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An Experimental Investigation on Flame Pulsation for a Swirl Non-Premixed Combustion

Author

Listed:
  • 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)

  • Xiaotian Hu

    (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)

  • Yibo Jiang

    (National Thermal Power Engineering & Technology Research Center, North China Electric Power University, Beijing 102206, China)

Abstract

Flame pulsation has a significant effect on combustion, and understanding its oscillatory behavior is important to the combustion community. An experiment was performed to analyze the pulsation characteristics of a swirl non-premixed flame under various parameters. The results showed that as fuel mass flow rate increased, the puffing frequency increased due to the decreased flame radiation fraction, and the puffing amplitude became smaller resulting in a more stable flame. With an increase in combustor pressure, the flickering frequency declined because of the increasing soot radiation, while the flickering amplitude uniformly increased, leading to more deteriorative flame stability. With an increment in mass flow rate of primary air, the puffing frequency decreased due to the enhanced mixing between fuel and primary air. Also, the puffing amplitude had an oscillating relationship with the mass flow rate of primary air. When the exit velocity of the injector was increased, the flickering frequency diminished nearly linearly because of the improving swirl intensity, and the flickering amplitude was approximately unaffected by injector exit velocity. Moreover, the measured puffing frequencies summarized over all cases varied within the range of 3–22 Hz, the predicted values from theoretical models based on non-swirl flame also fell within this range. The puffing frequency of swirl combustion was more sensitive to the variation in operating conditions than that of non-swirl combustion. Additionally, the obtained correlations indicated that the Strouhal number St was proportional to Fr −1.4 (the Froude number) and Re −2.9 (the Reynolds number), respectively.

Suggested Citation

  • Zhongya Xi & Zhongguang Fu & Xiaotian Hu & Syed Waqas Sabir & Yibo Jiang, 2018. "An Experimental Investigation on Flame Pulsation for a Swirl Non-Premixed Combustion," Energies, MDPI, vol. 11(7), pages 1-17, July.
  • Handle: RePEc:gam:jeners:v:11:y:2018:i:7:p:1757-:d:156174
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    References listed on IDEAS

    as
    1. Mao Li & Yiheng Tong & Jens Klingmann & Marcus Thern, 2017. "Impact of Vitiation on a Swirl-Stabilized and Premixed Methane Flame," Energies, MDPI, vol. 10(10), pages 1-16, October.
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    Cited by:

    1. Zhongya Xi & Zhongguang Fu & Syed Waqas Sabir & Xiaotian Hu & Yibo Jiang & Tao Zhang, 2018. "Experimental Analysis on Flame Flickering of a Swirl Partially Premixed Combustion," Energies, MDPI, vol. 11(9), pages 1-14, September.
    2. Mehdi Bidabadi & Peyman Ghashghaei Nejad & Hamed Rasam & Sadegh Sadeghi & Bahman Shabani, 2018. "Mathematical Modeling of Non-Premixed Laminar Flow Flames Fed with Biofuel in Counter-Flow Arrangement Considering Porosity and Thermophoresis Effects: An Asymptotic Approach," Energies, MDPI, vol. 11(11), pages 1-25, October.
    3. Zhongya Xi & Zhongguang Fu & Syed Waqas Sabir & Xiaotian Hu & Yibo Jiang, 2018. "An Experimental Study on Flame Puffing of a Swirl Partially Premixed Combustion under Varying Mass Flow Rate of Primary Air," Energies, MDPI, vol. 11(7), pages 1-14, July.

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