大气压氦气介质阻挡柱状放电的形成条件

Forming Conditions of Dielectric Barrier Columnar Discharges in Atmospheric-pressure Helium

大气压氦气介质阻挡放电可表现为均匀放电、柱状放电或丝状放电等放电形式,放电模式可为汤森放电、辉光放电或流注放电。柱状放电的形成条件、放电机理、动力学过程还远未掌握。为此研究介质阻挡柱状放电的形成条件,对气隙距离、电压频率和外加电场3因素,采用正交试验法研究其对放电形式的影响。采用方差分析研究各因素显著性,发现外加电场对柱状放电的形成影响最大,其次是电压频率和气隙距离。采用极差分析研究柱状放电形成条件,发现短间隙(2 mm、3 mm)、较低频率(10～16 kHz)、较低外加电场(0.212～0.247 kV/mm)有利于形成柱状放电。

Dielectric barrier discharges can present in some discharge types such as diffuse,columnar,or filamentary discharges,and in different modes such as the Townsend,glow,or streamer discharges modes.The forming condition,physical mechanism,and Kinetic process of the columnar discharges are far from being understood.To study the forming condition of dielectric barrier columnar discharges,we performed orthogonal tests by taking the gas gap,voltage frequency,and applied electric field as factors.The variance analysis shows that the applied electric field has the greatest influence on the formation of columnar discharges,while the gas gap and voltage frequency have the secondary influences.The range analysis shows that a shorter gas gap(2 mm,3 mm),a lower voltage frequecy(10~16 kHz),and a lower electric field(0.212~0.282 kV/mm)are beneficial to the formation of the columnar discharges.