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Effects of nozzle length on flame and emission behaviors of multi-fuel-jet inverse diffusion flame burner

Author

Listed:
  • Zhen, H.S.
  • Choy, Y.S.
  • Leung, C.W.
  • Cheung, C.S.

Abstract

An experimental study was performed to investigate the effects of the nozzle length on the air-pollutant-emission and noise-radiation behaviors of a burner utilizing a multi-fuel-jet inverse diffusion flame (MIDF). Comparison of the experimental results obtained from two MIDF burners, one with a long nozzle and the other with a short nozzle, operating under the same air/fuel supply conditions (Reair and Ф) shows rather significant differences in the flame appearance, flame centerline temperature, CO/CO2 concentrations and the noise radiation. The nozzle length influences development of the jets and hence interaction between the air/fuel jets including their mixing process. The short nozzle produces a flame with a shorter base height and a smaller potential core due to the enhanced air/fuel mixing. It also leads to faster and more complete combustion at the inner reaction cone of the flame due to the stronger and faster air/fuel mixing. The nozzle length affects the CO and CO2 concentrations, and higher peak values are obtained with the short-nozzle flame. Flame noise of the MIDF is defined as the noise radiation at different flame heights, which is of varying strength but of the same dominant frequency in the range of 250–700Hz. The noise radiation from the inner reaction cone of the flame is stronger than that from the lower and upper parts of the flame, and the maximum noise radiation occurs when the total amounts of air and fuel in the combustion zone are at the stoichiometric air/fuel ratio. For all the experiments conducted in the present study, the MIDF produced by the long nozzle is always noisier than its counterpart and it is due to the increase of the low-frequency noise components.

Suggested Citation

  • Zhen, H.S. & Choy, Y.S. & Leung, C.W. & Cheung, C.S., 2011. "Effects of nozzle length on flame and emission behaviors of multi-fuel-jet inverse diffusion flame burner," Applied Energy, Elsevier, vol. 88(9), pages 2917-2924.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:9:p:2917-2924
    DOI: 10.1016/j.apenergy.2011.02.040
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    Citations

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    Cited by:

    1. Shang, Fengju & Hu, Longhua & Sun, Xiepeng & Wang, Qiang & Palacios, Adriana, 2017. "Flame downwash length evolution of non-premixed gaseous fuel jets in cross-flow: Experiments and a new correlation," Applied Energy, Elsevier, vol. 198(C), pages 99-107.
    2. Rabee, Basem A., 2018. "The effect of inverse diffusion flame burner-diameter on flame characteristics and emissions," Energy, Elsevier, vol. 160(C), pages 1201-1207.
    3. Kapusta, Łukasz Jan & Shuang, Chen & Aldén, Marcus & Li, Zhongshan, 2020. "Structures of inverse jet flames stabilized on a coaxial burner," Energy, Elsevier, vol. 193(C).
    4. Wang, Qiang & Tang, Fei & Zhou, Zheng & Liu, Huan & Palacios, Adriana, 2017. "Flame height of axisymmetric gaseous fuel jets restricted by parallel sidewalls: Experiments and theoretical analysis," Applied Energy, Elsevier, vol. 208(C), pages 1519-1526.
    5. Zare, Saeid & Lo, Hao Wei & Roy, Shrabanti & Askari, Omid, 2020. "On the low-temperature plasma discharge in methane/air diffusion flames," Energy, Elsevier, vol. 197(C).
    6. Miao, J. & Leung, C.W. & Cheung, C.S. & Huang, Z.H. & Zhen, H.S., 2016. "Effect of hydrogen addition on overall pollutant emissions of inverse diffusion flame," Energy, Elsevier, vol. 104(C), pages 284-294.
    7. Wan, Huaxian & Gao, Zihe & Ji, Jie & Li, Kaiyuan & Sun, Jinhua & Zhang, Yongming, 2017. "Experimental study on ceiling gas temperature and flame performances of two buoyancy-controlled propane burners located in a tunnel," Applied Energy, Elsevier, vol. 185(P1), pages 573-581.

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