| The lightning in nature,the corona discharge on the transmission line and the arc discharge during the contact of the switch are all common gas discharge.Previous study of these discharge modes is mostly at low pressure,but they often occur at atmospheric pressure.In addition,to save energy,operate easily and reduce investment,the atmosphere is an ideal operating condition.Gas discharge at atmospheric pressure includes arc discharge,corona discharge,spark discharge,etc.Each discharge mode has its own characteristics and application fields.Different discharge modes can transist to each other at atmospheric pressure,but the transition boundary and physical mechanism are not clear.Therefore,this paper studies the characteristics and transitions of different discharge modes in air at atmospheric pressure.First of all,with the varitation of the gap distance and the applied dc voltage,the corona,filamentary,glowlike,glow and spark discharge as well as their transitions in ambient air are demonstrated.Electrical properties,optical properties and sound characteristics of discharge modes are studied.The influence of resistance,capacitor and cathode materials on discharge modes are also explored.Secondly,when the resistance value is reduced to 100 k?,a mixed air discharge mode is found.Meanwhile,the development process,electrical properties and optical properties of this mixed discharge mode are studied.Finally,the model of DC series arc is simulated.The arc generator is built and properties of DC arc are measured and analyzed.This paper provides an opportunity to stabilize and study different discharge modes and their transitions at atmospheric pressure,which is helpful for the further application of gas discharge at atmospheric pressure. |
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