The characteristics of corona discharge under actual conditions are closely related to the surrounding environmental conditions. In order to study the mechanism and law of the negative DC corona pulse characteristics with ambient temperature under different electrode shapes

a fluid dynamics model in which the influence of ambient temperature was taken into account was established in this paper

and the negative corona discharge model of needle-plate and rod-plate structure was calculated respectively. The rules that the Trichel pulse

electric field strength

electron density

pulse peak

pulse duration

and pulse frequency vary with environmental temperature were studied systematically. Through the calculation and analysis

it is found that the onset voltage of rod-plate model is lower

while the duration is longer. With the increase of ambient temperature

the value of pulse peak

pulse duration and pulse frequency will increase. Meanwhile

the electric field will be stronger in the discharge space and the movement of charged particles will be more rapid under higher temperature. Besides

the radius of curvature of the needle and rod electrode also affects the corona discharge

and the negative corona discharge is more intense when the radius of curvature is small.