A comparative study of bielectrode and triple electrode dielectric barrier discharge at atmospheric pressure

doi:10.3969/j.issn.1000-1565.2019.03.003

Abstract

Abstract: The electrode geometry has an important influence on the characteristics of dielectric barrier discharge(DBD). Investigation on electrode geometry of DBD and its plasma parameters is of great significance to optimize the operating parameters of DBD and improve its efficiency. The discharge characteristics of bielectrode DBD and triple electrode DBD excited by AC power are experimentally studied. The differences of their discharge images, voltage and optical signal waveforms are compared, and the variation of discharge parameters under different voltage amplitudes and optical emission spectrum in the range from 300 nm to 800 nm is studied. Results indicate that bielectrode DBD and triple electrode DBD have asymmetric discharge in the positive and negative half cycles due to the asymmetry of discharge device. The emission spectrum mainly contains the second positive band of N₂(C-B)(peaked at a wavelength of 337.1 nm), the first positive band of N₂(B-A), and the first negative band of N⁺2(A-X)(with wavelengths of 391.4 nm), and the oxygen atomic line at 777.4 nm. Nevertheless, the relative intensities are different. Compared with bielectrode DBD, triple electrode DBD has characteristics of lower initial voltage, more active- DOI:10.3969/j.issn.1000-1565.2019.03.003大气压下双电极和三电极介质阻挡放电的比较研究苏泽华,弓丹丹,刘仁静,贾鹏英,庞学霞(河北大学物理科学与技术学院,河北保定 071002)摘要:电极结构对介质阻挡放电(DBD)的特性有重要影响,研究DBD的电极结构以及等离子体参数对优化DBD反应器运行参数和提高放电效率具有重要意义.针对于此,本文研究了交流电源激励下的双电极DBD和三电极DBD的放电特性,比较了它们的放电图像,电压和光信号波形的异同,不同电压幅值下放电参量的变化,以及放电在300~800 nm的发射光谱.结果表明,双电极DBD和三电极DBD由于放电装置的不对称性,正负半周期的放电均存在不对称性;发射光谱中都包含N₂的第二正带系(C-B)(含波长为337.1 nm的谱线),N₂的第一正带系(B-A),N⁺₂的第一负带系(A-X)(含波长为391.4 nm的谱线),以及777.4 nm处氧原子谱线,但相对强度不同;与双电极DBD相比,三电极DBD具有起始电压低,放电产生活性粒子多,发光强度大的特点.关键词:光谱学;介质阻挡放电;放电特性;发射光谱中图分类号:O461.2 文献标志码:A 文章编号:1000-1565(2019)03-0235-06A comparative study of bielectrode and triple electrode dielectricbarrier discharge at atmospheric pressureSU Zehua, GONG Dandan, LIU Renjing, JIA Pengying, PANG Xuexia(College of Physics Science and Technology, Hebei University, Baoding 071002, China)Abstract:The electrode geometry has an important influence on the characteristics of dielectric barrier discharge(DBD). Investigation on electrode geometry of DBD and its plasma parameters is of great significance to optimize the operating parameters of DBD and improve its efficiency. The discharge characteristics of bielectrode DBD and triple electrode DBD excited by AC power are experimentally studied. The differences of their discharge images, voltage and optical signal waveforms are compared, and the variation of discharge parameters under different voltage amplitudes and optical emission spectrum in the range from 300 nm to 800 nm is studied. Results indicate that bielectrode DBD and triple electrode DBD have asymmetric discharge in the positive and negative half cycles due to the asymmetry of discharge device. The emission spectrum mainly contains the second positive band of N₂(C-B)(peaked at a wavelength of 337.1 nm), the first positive band of N₂(B-A), and the first negative band of N⁺2(A-X)(with wavelengths of 391.4 nm), and the oxygen atomic line at 777.4 nm. Nevertheless, the relative intensities are different. Compared with bielectrode DBD, triple electrode DBD has characteristics of lower initial voltage, more active- 收稿日期:2019-01-13 基金项目:国家自然科学基金资助项目(11575050;11875121);河北省自然科学基金资助项目(A2015201092;A2015201199;A2016201042) 第一作者:苏泽华(1992—),女,河北石家庄人,河北大学在读硕士研究生,主要从事气体放电等离子体特性研究. E-mail:18330248145@163.com 通信作者:庞学霞(1978—),女,河北三河人,河北大学副教授,主要从事低温大气等离子体物理化学反应数值模拟. E-mail:plasmalab@126.com第3期苏泽华等:大气压下双电极和三电极介质阻挡放电的比较研究particles, and higher luminous intensity.

Key words: spectroscopy, dielectric barrier discharge, discharge characteristics, optical emission spectrum

CLC Number:

O461.2

SU Zehua, GONG Dandan, LIU Renjing, JIA Pengying, PANG Xuexia. A comparative study of bielectrode and triple electrode dielectric barrier discharge at atmospheric pressure[J]. Journal of Hebei University (Natural Science Edition), 2019, 39(3): 235-240.

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