Investigation of electrode structure for dense ozone production using nanosecond pulsed powers

Ozone has a very strong oxidizability. Generally, the method using dielectric barrier discharges is used for ozone production, but efficiency of the ozone production is not sufficient. In this study, streamer discharges generated with nanosecond pulsed powers were utilized for the ozone production. In our previous studies, it was found that an inner wire electrode in coaxial reactor curved during pulse operation. Then, spark discharges were frequently observed near the approximating point of the inner wire electrode to the outer electrode. The phenomena were considered as a cause of decay of produced ozone concentration. Here, we introduced reactors whose inner electrode wire was constrained so as not to be distorted. A tungsten wire as an inner electrode in a coaxial reactor prevented the distortion with slacking of the wire by its strength. Also stainless wires as inner electrode were wound around a glass rod to obtain the same effect. Additionally, increase in streamer discharges was expected owing to an increase in total length of four wires. In the experiments using these reactors, spark discharges were hard to occur and decay of ozone concentration with spark discharges was suppressed.