Abstract
To evaluate the effect of wind on corona discharges occurring on the tip of a grounded rod during a negative charging process of thundercloud, a two-dimensional numerical model has been improved by considering the wind velocity as a driving force for the movement of the corona charges. It was found that not only wind speed but also wind direction have a significant effect on the distribution of corona charges, the local electric field around the rod, and the corona current. (1) Under the same wind speed, a larger horizontal wind can result in less accumulation of corona charges, a larger electric field, and a larger corona current. However, when the speed is less than 5 m s−1, the effect of wind direction on the corona current was weak. (2) Under the same wind direction, a larger wind speed can cause a larger corona current. However, when the horizontal wind component is smaller than the vertical, the larger wind speed would cause a smaller electric field. Thus, it is necessary to take the effects of the wind direction into consideration, rather than to consider its speed only, when studying the corona discharge and its effects on the upward leader.
Highlights
As noted by Macgorman et al [1], the corona discharge, which is often referred to as a “point discharge,” usually occurs in a variety of situations and locations, whenever the ambient electric field exceeds the corona onset threshold
The impact of the space charge generated from the corona discharge on the electric field at ground level or on the lightning attachment process has been an important issue studied by many scholars for a long time [2,3,4,5,6]
We will study in detail the effects of wind velocity on the corona discharge initiated from a grounded rod tip in the electric field produced by a thunderstorm
Summary
As noted by Macgorman et al [1], the corona discharge, which is often referred to as a “point discharge,” usually occurs in a variety of situations and locations, whenever the ambient electric field exceeds the corona onset threshold. Bazelyan et al [13] used a one-dimensional approximation model presented by Aleksandrov et al [16] to evaluate the effect of wind on the glow corona of a grounded electrode under thunderstorms and found that a moderate wind speed of 15 m s−1 increased the corona current peak value by more than 150%. They assumed that the wind blew radially from the rod tip, which is of no practical significance. We will study in detail the effects of wind velocity on the corona discharge initiated from a grounded rod tip in the electric field produced by a thunderstorm
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