Electrical And Spectral Properties And Simulation Of Characteristics Of Dielectric Barrier Discharge With Coaxial Cylindrical Structure

In view of economy and practicability,dielectric barrier discharge with coaxial cylindrical structure is studied.With argon as the main working gas under atmospheric pressure,a discharge device was designed by ourselves and commissioned to be processed by other units.Components of different sizes can be used to study the variation of discharge properties when the structural parameters change.The photoelectric characteristics of dielectric barrier discharge(DBD)were studied by means of electrical and optical methods under the excitation of an external AC power supply.The discharge waveform,electric field distribution,transmitted charge,capacitance value,power,power factor and other parameters are analyzed and studied by means of electromagnetic theory,empirical formula and Lissajous method.The electron excitation temperature was studied by using two argon spectra lines of 763.51 nm and 772.42 nm.The vibration temperature of nitrogen molecules was calculated by Boltzmann method.A new circuit model is constructed and the simulation results are compared with the experimental results.Firstly,the current waveform in dielectric barrier discharge at atmospheric pressure is studied and its basic form is analyzed.The distribution of applied electric field in coaxial structure is studied,which has important influence on the breakdown and discharge characteristics.The transport charge,breakdown voltage,dielectric capacitance,air gap capacitance,air gap voltage,power,power factor and other parameters are studied by means of Lissajous figure and theoretical derivation.The experimental results show that the structure parameters and power parameters have important effects on discharge.When the applied voltage increases,the current,transmitted charge and power will be significantly increased,indicating that the external voltage has a positive effect on the discharge intensity,but the air gap capacitance,dielectric capacitance,power factor and other parameters are not completely positively correlated with the applied voltage.When the structural parameters of the device,such as the inner electrode radius or the thickness of the tube wall,change and the applied voltage remains unchanged,the electrical characteristic parameters will also change,indicating that the discharge characteristics are also affected by the structural conditions of the device.The spectral lines in the process of discharge were collected,and the variation trends of electron excitation temperature and molecular vibration temperature were obtained by the analysis of 200-1000 nm spectrum,and the experimental results such as the small effect of the change of structural parameters on the study of gas temperature were found.In addition,the model of the coaxial cylindrical structure device is built by using the simulation circuit software Ltspice.According to the discharge characteristics of the device,the branch voltage source,the voltage regulator diode,the branch capacitor,the branch inductor and other components are introduced,and the parameters are designed.The discharge characteristics are analyzed through the test,and the results are similar to the experimental results.In the dielectric barrier discharge of coaxial cylindrical structure,it is found that the external power supply and the parameters of the structural device have direct influence on the discharge characteristics.By studying the relevant laws to control the variation of parameters,the production efficiency can be improved,the design cost can be reduced and the optimal working condition can be found,which is of great significance for the study of dielectric barrier discharge.It also provides reference for other industrial design applications.