Experimental Study for Effects of Volumetric Dielectric Barrier Discharge on Methane/Air Diffusion Flame CH* Chemiluminescence

被引：0
|
作者：
Chen Q.-Y. [1 ,2 ]
Nie W.-S. [1 ]
Chen C. [1 ]
Li T. [1 ,2 ]
Che X.-K. [1 ]
Tong Y.-H. [1 ]
Zhou S.-Y. [1 ]
机构：
[1] Department of Aerospace Science and Technology, Space Engineering University, Beijing
[2] Xi'an Satellite Control Center, Xi'an
[3] College of Energy and Power Engineering, Beihang University, Beijing
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2021年 / 42卷 / 11期
关键词：
CH* chemiluminescence; Diffusion flame; Flame height; Methane; Nonequilibrium plasma;
D O I：
10.13675/j.cnki.tjjs.200035
中图分类号：
学科分类号：
摘要：
To study the combustion-assisted effects of nonequilibrium plasma on a CH4/air diffusion flame, a spectral line at 430nm is selected to indicate the excited state radical CH* chemiluminescence occurred in the flame. The plasma is generated by a co-axial cylindrical actuator with high frequency alternating current source. The variations of CH* chemiluminescence images, flame heights, CH* radial profiles, and the combustion heat release rates of the flame with discharge voltage are analyzed under different air flow rates and equivalence ratios. Results show that the combustion upstream of the flame is enhanced by the plasma leading to the decrease of the height of CH* spatial distribution and flame, when the air flow rate is relatively low. As the flow rate rises, the fuel methane burns better. Then, the intensity and the extent of CH* increases in the downstream part of the flame. Due to the gas dynamic effect of the plasma, the radial distribution of CH4 is extended in the upstream region of the flame, which results in a larger range of combustion within the shear layer. The combustion intensity around the shear layer increases by the kinetic effect of the plasma, especially for a higher voltage. Moreover, the heat release rate increases notably near the injector outlet of the burner by the plasma. This phenomenon occurs easier, when the ratio of the momentum of air to the momentum of CH4 is large. © 2021, Editorial Department of Journal of Propulsion Technology. All right reserved.
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页码：2494 / 2505
页数：11
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