scholarly journals Simulation Study on Positive Corona Discharge of Receptors on Rotating Wind Turbine Blade Tips under Thundercloud Electric Fields

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4696
Author(s):  
Lu Qu ◽  
Yu Wang ◽  
Gang Liu ◽  
Minchuan Liao ◽  
Hansheng Cai ◽  
...  
Keyword(s):  
Wind Speed ◽  
Corona Discharge ◽  
Electric Fields ◽  
Charged Particles ◽  
Multicomponent Diffusion ◽  
Ion Migration ◽  
Positive Ions ◽  
Corona Current ◽  
Blade Rotation ◽  
Discharge Model

Recent lightning simulation experiments have not simulated the influence of blade rotation in the long term after corona inception. This study uses a finite element method and considers the adhesion and collision processes of positive ions, aerosol ions, and neutral particles to establish a two-dimensional positive corona discharge model based on a multicomponent diffusion transport equation. The microscopic distribution of these three types of particles and the influence mechanism of charged particles’ migration under electric fields and wind were studied. The results show that ion migration is affected by both electric field and wind speed. The higher the wind speed, the larger is the deviation amplitude of charged particles along the direction of wind. With an increase in wind speed, the corona current on the receptor surface gradually increases. When the wind speed is 30 m/s, the corona current peak value increases by almost six times when compared with that when no wind is present. From this, it can be inferred that blade rotation reduces the concentration of positive ion in the receptor area, thereby facilitating electron avalanche and streamer-leader conversion.

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

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Xiufeng Guo ◽  
Qilin Zhang ◽  
Jinbo Zhang
Keyword(s):  
Wind Speed ◽  
Electric Field ◽  
Corona Discharge ◽  
Wind Direction ◽  
Driving Force ◽  
Horizontal Wind ◽  
Wind Component ◽  
Two Dimensional ◽  
Corona Current ◽  
Discharge Model

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.

Continuum Modeling of Charged Particle Transport: RF Breakdown and Discharges of SF6

1986 ◽  
Vol 68 ◽  
Author(s):  
Brian E. Thompson ◽  
Herbert H. Sawun ◽  
Aaron Owens
Keyword(s):  
Electric Fields ◽  
Electron Attachment ◽  
Negative Ions ◽  
Rate Coefficients ◽  
Rf Discharge ◽  
Continuity Equations ◽  
Positive Ions ◽  
Discharge Model ◽  
Rf Breakdown ◽  
Charged Particle Transport

AbstractContinuity equations for the concentration of electrons, positive ions, and negative ions were constructed and solved to predict rf breakdown voltages and the electrical properties of SF, discharges.These balances for the three types of charged species include terms for convection (electric field-driven fluxes), diffusion, and reactions (ionization, electron attachment, and negative-positive ion recombination).The mobilities, diffusivities, and reaction rate coefficients necessary for the rf discharge model are based on reported measurements and calculations of these parameters in dc electric fields.The electric fields developed in the rf discharge are calculated from Poisson's equation and applied voltage conditions.Predictions based on this model are compared with measured rf breakdown characteristics of SF6.

Neutralization of a spray of electrically charged droplets by a corona discharge

2016 ◽  
Vol 801 ◽  
pp. 130-149 ◽  
Author(s):  
F. J. Higuera
Keyword(s):  
Electric Field ◽  
Corona Discharge ◽  
Opposite Polarity ◽  
Forced Flow ◽  
Lagrangian Description ◽  
Charged Droplets ◽  
Corona Current ◽  
Current Voltage ◽  
Eulerian Descriptions ◽  
Electrically Charged

The neutralization of a dilute spray of electrically charged droplets by ions of the opposite polarity generated by a corona discharge at a wire ring is analysed numerically. A Lagrangian description of the spray and Eulerian descriptions of the gas and the ions are used to deal with this two-way coupled problem. A model of the corona consisting of a line of charge and a distribution of ion sources is proposed. In the configuration that is analysed, neutralization usually begins at the shroud of the spray and extends to inner regions when the corona current increases. The number density of droplets is large at the shroud due to neutralized droplets that are no longer pushed by the electric field. These droplets can be dragged towards a collector surface by a weak forced flow that overcomes the ionic wind due to the force of the ions on the gas. The fraction of the spray charge that is neutralized increases with the corona current, but the value of this current required for full neutralization is several times larger than the inlet electric current of the spray owing to loss of ions to the boundaries of the system. The electric field induced by the charge of the droplets opposes the field due to the voltage applied between the wire ring and the extractor through which the droplets are injected, and thus reduces the threshold voltage of the corona and significantly affects its current–voltage characteristic, which may become multivalued. In turn, the electric field due to the applied voltage and the space charge of the ions affects the shape of the spray and the velocity of the droplets.

2-D Measurement of Charged Particles Diffusing From a Double DC Corona Discharge Ionizer

2013 ◽  
Vol 41 (8) ◽  
pp. 1863-1868 ◽  
Author(s):  
Kazunori Takahashi ◽  
Makoto Sato ◽  
Takahiro Ohkubo ◽  
Tamiya Fujiwara ◽  
Koichi Takaki
Keyword(s):  
Corona Discharge ◽  
Charged Particles

Wave–particle interaction and enhanced precipitation of charged particles

1985 ◽  
Vol 63 (4) ◽  
pp. 445-452
Author(s):  
R. N. Singh ◽  
R. Prasad
Keyword(s):  
Electric Fields ◽  
Geomagnetic Field ◽  
Pitch Angle ◽  
Electron Flux ◽  
Particle Interaction ◽  
Charged Particles ◽  
Lower Ionosphere ◽  
Wave Interaction ◽  
Whistler Wave ◽  
Inhomogeneity Parameter

In addition to parallel electric fields, the distortions in the geomagnetic field have been considered in the study of resonant whistler wave interaction with gyrating charged particles. Mead axisymmetric distortions in the geomagnetic field have been considered and new expressions for the inhomogeneity parameter, αd, have been obtained. Considering the diffusion of charged particles in pitch angle, the variation in the precipitating electron flux under varying magnetospheric conditions has been computed. The variation in the distribution of trapped charged particles is shown to play an important role in controlling the electron flux precipitated into the lower ionosphere.

Corona Discharge Model for Transmission Lines by Lumped Elements

2011 ◽  
Vol 9 (1) ◽  
pp. 804-809
Author(s):  
Eduardo Coelho Marques Costa ◽  
Sergio Kurokawa ◽  
Jose Pissolato
Keyword(s):  
Corona Discharge ◽  
Transmission Lines ◽  
Lumped Elements ◽  
Discharge Model
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