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王金华, 琚荣源, 蔡骁, 张玮杰, 黄佐华. 旋转滑动弧等离子体对稀燃旋流火焰影响的实验研究. 力学学报, 2023, 55(12): 2732-2740. DOI: 10.6052/0459-1879-23-371
引用本文: 王金华, 琚荣源, 蔡骁, 张玮杰, 黄佐华. 旋转滑动弧等离子体对稀燃旋流火焰影响的实验研究. 力学学报, 2023, 55(12): 2732-2740. DOI: 10.6052/0459-1879-23-371
Wang Jinhua, Ju Rongyuan, Cai Xiao, Zhang Weijie, Huang Zuohua. Experimental study on the effects of rotating gliding arc plasma on lean premixed swirling flames. Chinese Journal of Theoretical and Applied Mechanics, 2023, 55(12): 2732-2740. DOI: 10.6052/0459-1879-23-371
Citation: Wang Jinhua, Ju Rongyuan, Cai Xiao, Zhang Weijie, Huang Zuohua. Experimental study on the effects of rotating gliding arc plasma on lean premixed swirling flames. Chinese Journal of Theoretical and Applied Mechanics, 2023, 55(12): 2732-2740. DOI: 10.6052/0459-1879-23-371

旋转滑动弧等离子体对稀燃旋流火焰影响的实验研究

EXPERIMENTAL STUDY ON THE EFFECTS OF ROTATING GLIDING ARC PLASMA ON LEAN PREMIXED SWIRLING FLAMES

  • 摘要: 等离子体助燃技术被认为是非常有前景的燃烧调控技术, 具备显著增强极端条件下的点火和火焰稳定燃烧性能的潜力. 滑动弧放电等离子体具有能量强、电弧作用范围广以及适用于高压等优点, 文章实验研究了三维旋转滑动弧放电等离子体对稀燃预混钝体旋流甲烷/空气火焰的影响规律. 研究了等离子体的特性, 包括电学特性、运动特性、光学特性以及温升效应. 利用OH-PLIF得到了旋流火焰结构以及火焰结构转变过程, 并且研究了等离子体对稀燃吹熄极限的拓展作用. 最后利用气体排放仪测量了燃烧室出口处旋流火焰污染物NOx排放. 结果表明旋转滑动弧放电能够产生大量的活性自由基, 可以增强燃烧中的化学链式反应, 另外整体热效应比较弱, 主要体现为局部加热作用, 放电特性与空气流量和施加电压密切相关. 旋转滑动弧能够提高火焰稳定性并且有效拓展吹熄极限, 这主要是因为旋转滑动弧放电可以作为点火源和火焰稳定器, 能够点燃混合气并且形成外回流区火焰, 使得火焰根部更加稳定. 对于旋转滑动弧放电等离子体对旋流火焰污染物排放的影响, 研究发现等离子体放电能够增加NOx排放, NO的形成来源于等离子体放电, 燃料的加入使得NO的含量低于空气中放电时NO的含量. 旋转滑动弧放电导致NO的排放最少增加65%, 且NO的排放随着当量比降低而降低.

     

    Abstract: Plasma-assisted combustion is considered a highly promising combustion control technique with substantial potential to enhance ignition and flame stability performance under extreme conditions. Gliding arc discharge plasma, characterized by its high energy, wide arc coverage, and suitability for high-pressure conditions, presents advantageous features for applications such as ignition and combustion enhancement. In this study, we experimentally investigate the influence of three-dimensional rotating gliding arc (RGA) plasma on lean premixed bluff-body swirling methane/air flames. Firstly, the discharge characteristics were thoroughly examined, including the electrical and spectral properties, the motion and dynamic behavior of the arc column, and thermal effects. Then the structure and flame morphology transition process of swirling methane/air flames were obtained using OH-PLIF (planer laser-induced fluorescence), and the effectiveness of plasma in extending the lean blowoff limits of swirling flames was investigated. Finally, the NOx emissions in swirling flames were measured using the Gasmet DX4000 FTIR (Fourier Transform Infrared) gas analyzer, with the sampling probe positioned at the outlet of the combustion chamber. The results demonstrate that RGA plasma could generate a substantial number of active radicals, promoting flame chemical chain reactions. Additionally, the overall thermal effects are relatively weak, primarily manifesting as localized heating. The discharge characteristics are closely related to the airflow and applied voltage. RGA plasma could enhance flame stability and extend the lean blow-off limit effectively. This enhancement is primarily attributed to the fact that RGA plasma could serve as an ignition source and flame stabilizer, effectively igniting the mixture and facilitating the formation of an outer recirculation zone flame. Finally, this study reveals that RGA plasma increases NOx emissions, as NO originates from the plasma. The addition of fuel resulted in a decrease in NO emission in comparison with NO content during the discharge in air. Particularly, RGA plasma leads to a minimum of 65% increase in NO emissions, and NO emissions decrease with decreasing equivalence ratio.

     

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