论文总字数：31509字

摘 要

气液两相介质阻挡放电（DBD）是以液体作为地电极，在空气中进行放电的一种特殊放电形式，近年来一直备受国内外学者的关注。目前这种放电形式广泛应用于臭氧发生器和环境保护的工业领域中。然而在实际应用中，影响气液两相DBD的因素较多，其中某些因素对气液两相DBD影响较大。因此在研究气液两相DBD特性时，进行反应器结构、影响因素、放电机制等方面的研究对于优化反应器设计、提高放电效率和实现大规模的工业应用具有重要意义。

本课题主要研究了两种不同反应器结构（对称电极结构反应器与不对称电极结构反应器）对气液两相DBD特性的演变规律以及不同影响因素对气液两相DBD的电气特性、光学特性、等离子体参量等的影响。并在此基础上比较了两种电极结构反应器气液两相DBD的放电形式、放电参量以及放电形态之间的差异，结合气体放电的放电机理和理论，对出现这些差异的原因给出了一个合理的解释,并加以论证。

研究表明：不对称电极结构反应器气液两相DBD的电流波形在电压的正负半周内呈不对称分布，而对称电极结构反应器气液两相DBD的电流波形基本对称地分布在电压的正负半周期内。随着外加电压幅值的增加，两种电极结构反应器气液两相DBD的电流脉冲强度及密度增大。

不同影响因素下两种电极结构反应器气液两相DBD等离子体中粒子种类没有变化，其主要成分为250~450nm之间各波段的N₂分子，在589.0nm处测得钠原子谱线。随着外加电压幅值的增加各波长的粒子谱线强度均增大，相同条件下对称电极结构反应器中气液两相DBD等离子体中粒子谱线强度小于不对称电极结构反应器DBD；根据上述光谱数据拟合得到的两种结构气液两相DBD等离子体气体温度在300~700K范围之内，并且随着外加电压幅值的增加而增大。

由于反应器结构不同，导致不同因素对气液两相DBD的影响不同。固定电源频率为17.5kHz，对称电极结构反应器气液两相DBD在放电间隙距离为4mm时，放电较强烈，放电功率及传输电荷量较大，而不对称电极结构反应器气液两相DBD则在放电间隙距离为4mm时放电最强烈。实际应用中应当根据反应器结构选择与之匹配的放电参数，增加单位空间内的放电功率，提高反应器的利用效率。

关键词：气液两相 介质阻挡放电 反应器结构 对称电极结构反应器 不对称电极结构反应器

Reactor structure on the comparison of gas liquid two phase DBD discharge characteristics

Abstract

Gas-liquid two phase dielectric barrier discharge (DBD) is a liquid as electrode, a special electric discharge in air discharge form, has been praised by the attention of scholars both at home and abroad in recent years. The current discharge form are widely used in the ozone generator, and environmental protection in the industrial field. However, in practice, the influencing factors of gas liquid two phase DBD is more, some of the factors that affect gas liquid two phase DBD is bigger. Therefore, when studying the characteristics of gas liquid two phase DBD reactor structure, influence factors, the discharge mechanism research on optimizing reactor design, improving the efficiency of the discharge and realize large-scale industrial application is of great significance.

This topic mainly studies the structure of two different reactor (symmetric electrode structure reactor with asymmetric electrode reactor) the evolution law of the characteristics of the gas liquid two phase DBD and the different influence factors on the gas liquid two phase of DBD electrical properties, optical properties, such as plasma parameters. Based on the comparison of the two kinds of electrode reactor gas liquid two phase structure form of DBD discharge, the discharge parameter, and the differences between the discharge form, combining with the discharge mechanism and the theory of gas discharge, for the reasons for these differences are given a reasonable explanation, and verified.

Studies show that asymmetric electrode structure of gas liquid two phase DBD reactor current waveform in the positive and negative half cycle of voltage is asymmetrical distribution of gas liquid two phase DBD reactor and symmetrical electrode structure basic symmetrically distributed current waveform in the positive and negative half cycle of voltage. With the increase of applied voltage amplitude, two electrode structure of gas liquid two phase DBD reactor current pulse intensity and density increases.

Two kinds of electrode structure under different influencing factors of particles in the gas liquid two phase DBD plasma reactor types did not change, its main composition is between 250

~ 450 nm N₂ molecules of each band is measured at 589.0 nm sodium atomic spectral lines. With the increase of applied voltage amplitude of each wavelength spectral line intensity of particles were increased, under the condition of same symmetrical electrode structure of the reactor in gas liquid two phase DBD plasma particles spectral line intensity is less than the asymmetric electrode structure DBD reactor; According to the spectral data fitting for the two kinds of structure of gas liquid two phase DBD plasma gas temperature in the range of 300 ~ 700 k, and with the increase of applied voltage amplitude increases.

Due to different reactor structure, the influence of different factors on the gas liquid two phase DBD are different. Fixed power frequency of 17.5 kHz, symmetrical electrode structure gas liquid two phase DBD reactor in discharge gap distance of 4 mm, discharge is strong, discharge power and transmission charge amount is larger, and asymmetric electrode reactor structure while the gas liquid two phase DBD discharge gap distance of 4 mm when discharging the strongest. Practical application should choose according to the reactor structure matching discharge parameters, increase the discharge power unit space, improve the use efficiency of the reactor.

Keyword：Gas-liquid mixture, DBD, The reactor structure, Symmetric electrode structure reactor, Asymmetric electrode structure reactor

目录

摘要 I

Abstract III

第一章 绪论 1

1.1概述 1

1.1.1等离子体 1

1.1.2介质阻挡放电 1

1.1.3 气液两相介质阻挡放电的产生和放电机理 3

1.2气液两相介质阻挡放电的国内外研究现状 4

1.2.1国内研究 4

1.2.2国外研究 5

1.3主要研究内容 6

第二章 实验装置的建立及分析方法 8

2.1实验装置 8

2.2气液两相DBD放电特性测量 9

2.2.1电气特性测量 9

2.2.2电气参数运算 10

2.3气液两相DBD光学特性测量 13

2.4小结 14

第三章 不对称电极结构反应器中气液两相DBD特性研究 15

3.1 气液两相DBD放电特性演变规律 15

3.1.1电气特性演变规律 15

3.1.2发光特性演变规律 17

3.1.3光谱特性演变规律 18

3.2电气参量演变规律 20

3.2.1分子转动温度及振动温度 20

3.3小结 21

第四章 对称电极结构反应器中气液两相DBD放电特性的研究 22

4.1气液两相DBD放电特性的演变规律 22

4.1.1电气特性的演变规律 22

4.1.2发光特性的演变规律 24

4.1.3 光谱特性演变规律 25

4.2 电气参量演变规律 27

4.2.1 分子转动温度及振动温度演变规律 27

4.3小结 28

第五章 结论 29

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