Fundamental Study of Barrier Discharge and Ozone Generation Characteristics for Multiple Needles to Plane Configuration

Abstract

A multiple needles electrode system is one of the good configurations because of easy generation of corona and dielectric barrier discharge suitable to ozone production. On this configuration, discharge and ozone generation characteristics are affected by needle configuration such as needle density, adjacent needles, but their influence has not been clarified in detail until now. In this study, the relationship between barrier discharge characteristics and ozone generation under AC voltage application has been investigated for triple needles-plane configuration with two different needle-tip curvatures (r = 15, 80 m) in dry air, which is a simpler multiple needles configuration. Characteristics of barrier discharge and ozone generation depend on the needle-tip distance and need-tip radius. In the case of the multiple needles configuration with a smaller needle-tip's distance, the barrier discharge characteristics have been strongly affected by the adjacent needles each other. Especially, the ozone production characteristics depend on the needles configurations. The configuration with a smaller needles distance has good ozone productivity compared with other configurations. In addition, ozone concentration and ozone generation efficiency for the triple needles with r = 80 m were higher than those for the needles with r = 15 m. These results can be interpreted by the effect of the space charges and accumulated charges induced by corona discharge and barrier discharge on the space for ozone generation.