Influence of gas heating and product molecules on discharge characteristics in dry-air-fed ozonizer

Influences of gas heating and product molecules on discharge characteristics in dry-air-fed ozonizer was investigated. Especially, the dependence of gas temperature in streamer channel on occurrence frequency of streamer discharge was investigated in detail. In the experiment, repetitive positive or negative impulse streamer was generated respectively between needle-plane electrodes in synthetic air at atmospheric pressure. The repetition rate of the applied pulse voltage was controlled from 0.1 to 7.0 kilo-pulse/sec (kpps). The temperature of streamer channel was estimated from the emission spectrum of N₂ 2nd positive system band (0-0). As a result, the gas temperature increased with increasing the pulse repetition rate in both polarities. In the case of positive polarity, the gas temperature increased from 341 to 383 K in response to the increase of repetition rate (0.1 to 6.0 kpps). Eventually, sparkover occurred at 7.0 kpps due to the increase of reduced electric field (E/N) caused by gas heating. The product ozone concentration was saturated with increasing the pulse repetition.