Dielectric barrier discharge characteristics of three-electrode structure under dual-source excitation
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摘要: 介质阻挡放电 (DBD) 在工业中得到广泛应用，但效率限制了它的进一步应用。提出了一种DBD结构和针板结构相结合的三电极结构。将正极性脉冲电源施加在DBD电极上，负极性脉冲电源施加到针板电极上。分析了不同结构下三电极DBD的放电特性、现象和光谱强度。结果表明，三电极结构更加有利于DBD放电通道的产生，其放电均匀性、发光强度均强于双电极DBD，特别是在丝网接地电极条件下，放电更加强烈。当三种电极结构正极性电压维持在11 kV，负极性电压为−5 kV时，丝网接地三电极中DBD的放电电流峰值达到1.54 A，而实心接地三电极和传统双电极中DBD的放电电流峰值为1.14 A和0.74 A。在负极性脉冲维持期间，针网间隙处于击穿状态，DBD放电出现很大的放电电流。在三电极结构中，随着施加在针板上负极性电压的升高也使三电极DBD放电更加强烈。不同结构下的DBD的放电光谱表明在丝网接地时三电极DBD激发粒子的光谱强度最强。这一趋势与DBD放电电流和功率一致。Abstract: Dielectric barrier discharge (DBD) is widely used in industry, but the efficiency limits its further application. This paper proposes a three-electrode structure combining a DBD structure and a needle-plate structure. A positive polarity pulsed power supply is applied to the DBD electrode and a negative polarity pulsed power supply is applied to the needle plate electrode. The discharge characteristics, phenomena and spectral intensity of the three-electrode DBD under different structures are analyzed. The results show that the three-electrode structure is more beneficial to the generation of DBD discharge channels, and its discharge uniformity and luminous intensity are stronger than that of the two-electrode DBD, especially under the condition of mesh grounded electrode. When the positive polarity voltage of the three-electrode structure was maintained at 11 kV and the negative polarity voltage was −5 kV, the peak discharge current of DBD in the mesh grounded three-electrode reached 1.54 A, while the peak discharge currents of DBD in the solid grounded three-electrode and the traditional two-electrode were 1.14 A and 0.74 A respectively. During the period of the negative polarity pulse maintenance, the needle mesh gap was in the state of breakdown, and the DBD discharges appeared to have a large discharge current. In the three-electrode structure, the three-electrode DBD discharges also become more intense with the increase of the negative polarity voltage applied to the needle plate. According to the discharge spectra of DBD under different structures, spectral intensity of excited particles is the strongest among the three-electrode DBD grounded with wire mesh. This trend is consistent with the discharge current and power of DBD.
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图 3 高压脉冲电源电压输出波形图
Figure 3. Output voltage waveforms of high-voltage pulse power supply
图 5 不同电极结构下DBD放电的电压-电流波形图
Figure 5. Voltage current waveform of DBD discharge under different electrode structures
图 6 双电极和三电极DBD放电电流对比
Figure 6. Discharge current comparison between double-electrode and three-electrode DBDs
图 7 不同结构的DBD在不同正极性压下的放电功率
Figure 7. Discharge power of DBD under different positive voltage with different structures
图 8 不同结构的DBD在不同负极性电压下的放电功率
Figure 8. Discharge power of DBD under different negative voltage with different structures
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