高温DBD系统的研制及其放电特性研究

Development of a high-temperature DBD system and its discharge characteristics

为探究高温条件下介质阻挡放电特性,采用氮化硅陶瓷为绝缘介质的同轴管式结构研制了一套可在800℃高温下运行的DBD放电系统,研究了在氮气气氛中不同温度条件下的DBD放电性能。结果表明,研制的DBD系统可在室温到800℃范围内实现稳定放电。随着电压逐步提升,内电极附近区域最先发生细丝放电,强度优于外电极;随着温度的升高,放电逐步变得均匀;在维持外加电压不变时升高温度,有效电流和放电功率显著增大;高温环境DBD性能稳定,600℃时系统运行1 h后能量变化方差仅为0.81。

In order to investigate the characteristics of dielectric barrier discharge(DBD)at high temperature,a DBD system that uses silicon nitride ceramic insulating medium and has a coaxial tube structure is developed,which can operate at a temperature up to 800℃.The discharge characteristics of this DBD system at different temperatures are studied in a nitrogen atmosphere.The results show that this DBD system demonstrates well discharge characteristics at high temperature.As the voltage increases gradually,the discharge occurs firstly in the area near the inner electrode,with an intensity stronger than that near the outer electrode.With the increase of temperature,the discharge becomes more uniform.The effective current and discharge power both increase greatly when the temperature goes up under a constant applied voltage.This system maintains a stable performance in a high temperature circumstance.The variance of discharge energy is 0.81,at 600℃,within 1 h.At 600℃,the variance of energy change is 0.81 only after the system runs for 1 h.