Numerical Simulation On Discharge Characteristics Of Pulsed DBD For Ozone Generation At Atmospheric Pressure

Due to energy is compressed on the time scale in pulsed dielectric barrier discharge(DBD),high power and high-energy electron is produced.The presence of dielectric makes streamer uniform and promotes the development of streamer.In order to improve the ozone yield,a lot of scholars have studied on pulsed DBD by changing the electrode structure,voltage form.Although ozone yield is improved to a certain extent,the limitation of experimental conditions results in imperfect discharge mechanism.In this paper,one-dimensional hydrodynamic simulation model is established,which consist with 12 species and 65 chemical reactions,to investigate the mechanism of pulsed DBD.Meanwhile,voltage-current characteristic obtained by experiment is compared with simulated result to verify the validation of the model.On the basis of validation model,discharge characteristics and energy transfer mechanism in pulsed DBD for ozone generation are study systematically.The main conclusions are as follows:1)Firstly,single pulse DBD for ozone generation is numerically simulated.Simulation results show that twice discharge with opposite polarity appears in one circle of pulse discharge.In current density rising stage,reduced electric field and the average electron energy obtain the maximum in cathode sheath,while the maximum electron density is obtained in the outer sheath layer.With the discharge development,the maximum of them are growing and continuously to the cathode movement,and cathode sheath is constantly narrow,simultaneously.In the current density falling stage,reduced electric field and the average electron energy increase in the vicinity of anode,while decrease in the other positions.It is also found that 19.4 % of input energy is absorbed by electron,and 41.6 % of which is used to maintain reaction energy required to produce ozone.2)The effects of pulse parameters on the discharge characteristics in the pulsed DBD are performed systematically.Results show that current density,corona inception voltage electron density,and average electron energy increase with the increase of pulse voltage amplitude.The first discharge current density,electron density,average electron energy and corona inception voltage decreases,while second discharge current increase as the increase of pulse rising time.The change of the pulse width has no effect on the first discharge current density,but the secondary discharge current density decreased with the increase of pulse width.