Glow corona generation and streamer inception at the tip of grounded objects during thunderstorms: revisited

Becerra, Marley

doi:10.1088/0022-3727/46/13/135205

Cited by 40 publications

(41 citation statements)

References 25 publications

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“…, , exp 0.01 0.02 (9) where is the radius of inner conductor and , are coordinates (unit in cm). The maximum density 10 cm is assumed as a reasonable value of nature background ionization caused by radioactivity and cosmic rays [38].…”

Section: Initial Condition and Applied Voltagementioning

confidence: 99%

“…Since thunderclouds are mostly negatively charged, high electric fields are often induced on grounded tall objects, producing positive glow corona discharges. It has been suggested that the transition from glow corona to streamers is vital when investigating the initiation of upward lightning [5][6][7][8][9][10]. For the above-mentioned reasons, it is of great interest to evaluate the conditions required for the transition from stable glow corona to streamers.…”

Section: Introductionmentioning

confidence: 99%

“…takes place in front of the anode is usually difficult to solve under the long simulation times required to reach stable glow corona. One general strategy to avoid the complexity of stable glow corona calculations is to neglect the ionization layer by assuming the surface electric field to be constant and equal to the onset electric field [6,9,27,28]. Several studies of glow corona to streamer transition can be found in the literature where this assumption, also known as Kaptzov's approximation, is used.…”

Section: Introductionmentioning

confidence: 99%

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On the transition from stable positive glow corona to streamers

Liu¹,

Becerra²

2016

J. Phys. D: Appl. Phys.

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A two-dimensional numerical simulation of the transition from stable positive glow corona to streamers in coaxial cylindrical configuration is presented. The hydrodynamic model with several convection-dominated continuity equations together with Poisson equation are solved with consideration of the ionization layer. The transition from a stable positive glow corona produced under a DC voltage to streamers is investigated under a sudden change of the applied voltage. The critical rate of rise of voltage required for the transition from positive glow to streamer corona is evaluated with a voltage ramp. By introducing either physical or numerical instabilities into the model, streamers with filamentary structures are observed, which produce a sudden increase of the discharge current by more than two orders of magnitude. It is also found that the surface electric field of the corona-generating conductor deviates from the onset electric field, casting doubts about the validity of Kaptzov's approximation to evaluate the transition from stable glow to streamers.

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Section: Initial Condition and Applied Voltagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the transition from stable positive glow corona to streamers

Liu¹,

Becerra²

2016

J. Phys. D: Appl. Phys.

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“…However, they assumed that the wind blew radially from the rod tip, which is of no practical significance. By using a 2D symmetrical model, Becerra [17] argued that the simulated results of Bazelyan et al [13] overestimated the influence of the corona discharge. Zou et al [15] have developed a 2D time-dependent model and found that the corona current increases almost linearly with the horizontal wind speed, but the effect of vertical wind on the corona current was not considered.…”

Section: Introductionmentioning

confidence: 99%

“…Although in most of the current numerical simulations [9,10,13,16,17], the corona discharge on the grounded objects is seen as symmetric. In practice, corona discharges on a grounded object during a thunderstorm can hardly avoid the presence of the wind.…”

Section: Introduction Of the Time-dependent Numerical Model Ofmentioning

confidence: 99%

Improvement of Corona Discharge Model and Its Application on Simulating Corona Discharge in the Presence of Wind

Guo

Zhang

2017

Mathematical Problems in Engineering

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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.

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Corona discharges from a windmill and its lightning protection tower in winter thunderstorms

Wang

Rison

et al. 2017

JGR Atmospheres

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This paper presents lightning mapping array (LMA) observations of corona discharges from a windmill and its lightning protection tower in winter thunderstorms in Japan. Corona discharges from the windmill, called windmill coronas, and those from the tower, called tower coronas, are distinctly different. Windmill coronas occur with periodic bursts, generally radiate larger power, and possibly develop to higher altitudes than tower coronas do. A strong negative electric field is necessary for the frequent production of tower coronas but is not apparently related with windmill coronas. These differences are due to the periodic rotation of the windmill and the moving blades which can escape space charges produced by corona discharges and sustain a large local electric field. The production period of windmill coronas is related with the rotation period of the windmill. Surprisingly, for one rotation of the windmill, only two out of the three blades produce detectable discharges and source powers of discharges from these two blades are different. The reason for this phenomenon is still unclear. For tower coronas, the source rate can get very high only when there is a strong negative electric field, and the source power can get very high only when the source rate is very low. The relationship between corona discharges and lightning flashes is investigated. There is no direct evidence that corona discharges can increase the chance of upward leader initiation, but nearby lightning flashes can increase the source rate of corona discharges right after the flashes. The peak of the source height distribution of corona discharges is about 100 m higher than the top of the windmill and the top of the tower. Possible reasons for this result are discussed.

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Glow corona generation and streamer inception at the tip of grounded objects during thunderstorms: revisited

Cited by 40 publications

References 25 publications

On the transition from stable positive glow corona to streamers

On the transition from stable positive glow corona to streamers

Improvement of Corona Discharge Model and Its Application on Simulating Corona Discharge in the Presence of Wind

Corona discharges from a windmill and its lightning protection tower in winter thunderstorms

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