Influence of Electrode Gap on Characteristics of Dielectric Barrier Discharge
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摘要: 为研究不同电极间隙下的表面介质阻挡放电特性，利用相机拍摄等离子实物图，分析电极间隙对等离子延伸的影响；测量其放电波形，分析消耗功率随电极间隙的变化趋势；通过红外热像仪拍摄介质板表面温度分布，探究温度分布特性随间隙的变化，同时测量不同间隙下诱导气流速度大小，分析电极间隙对诱导气流的影响；利用电子天平分析电极间隙对表面介质阻挡放电（SDBD）装置体积力的影响；最后，分别对不同间隙下4个放电参数变化趋势机理进行了讨论. 研究结果表明：等离子体延伸度、消耗功率、最高温度、诱导气流速度以及体积力均随电极间隙的增加呈先增后减的变化趋势；在固定激励电压下，存在一个最佳放电电极间隙. 该研究结果为表面介质阻挡放电装置实现更好的流动控制提供了一定的参考.Abstract: To gain a better understanding of the influence of the electrode gap on the SDBD (surface dielectric barrier discharge) actuator discharge characteristics, plasma extension, and power consumption were analysed using a camera and oscilloscope under different electrode gaps. Meanwhile, the temperature distribution around the exposed electrode was measured and discussed based on images from an infrared thermal imager. The variations in the induced flow velocity and body force were recorded using a Pitot and an electron balance, and the mechanism of variations of four parameters under different gaps is discussed respectively. The results indicate that all four discharge parameters first increase and then decrease with this gap, and an optimum electrode gap of an SDBD actuator discharge exists under a fixed discharge voltage. A reference is also provided for achieving a preferable airflow control using an SDBD actuator.
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图 3 不同间隙下放电等离子体延伸实物图
Figure 3. Emissions of plasma extension length with different electrode gaps
图 5 不同间隙下消耗功率变化曲线
Figure 5. Variation in power consumption with different electrode gaps
图 6 不同间隙下绝缘介质板温度分布
Figure 6. Image of dielectric temperature distribution with different electrode gaps
图 7 不同电极间隙下最高温度变化曲线
Figure 7. Variation of maximum temperature with different electrode gaps
图 8 不同电极间隙下诱导气流变化曲线
Figure 8. Variation of induced flow velocity with different electrode gaps
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