Numerical Calculation Research on Pulse Discharge Process of Tungsten Electrode in Water
In this paper,a fluid mathematical model of the needle-needle tungsten electrode breakdown discharge under the action of pulse voltage is established,and the COMSOL software is used to simulate the pulse discharge process in water,and the morphology development of the streamer,the density of the charged particles and the mi-gration velocity of the streamer during the breakdown of the tungsten electrode under different discharge conditions are studied.The density and the migration velocity of the stream column.The simulation results show that when the needle-to-needle electrode spacing is 3mm and the pulse voltage amplitude is 1 1-15kV,the maximum electron den-sity is on the order of 1023·m-3.With the increase of the voltage amplitude,the electrons in the plasma The peak density will also increase,and the development speed of the streamer will be accelerated;when the electrode gap of the tungsten electrode is increased,the time for the development of the streamer will be longer,but the development speed of the streamer will also be faster.The electron density calculated by the measurement data of the spectrome-ter in the experiment is also on the order of 1023·m-3,which verifies the rationality of the simulation results.The magnitude of the electron density will affect physical quantities such as temperature,electric field strength and free radical reaction rate in the discharge channel,so the numerical calculation of the electron density is of great signifi-cance.
pulse discharge in watermathematical modelelectron densitystreamer
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