Influence of Nanosecond Pulse Voltage Amplitude and Rising/Falling Edge Time on the Uniformity of Atmospheric Pressure N2 DBD
Atmospheric pressure N2 dielectric barrier discharge(DBD)has broad application prospects in the fields of material modification,environmental protection,disinfection and sterilization,ozone synthesis,and flow control,and discharge uniformity is very important for its application.In this paper,the effects of voltage amplitude,pulse ris-ing/falling edge times,and repetition frequency on the uniformity and discharge process of nanosecond pulse N2 DBD are studied by electrical and optical diagnoses.The discharge images and voltage-current waveforms are quantitatively ana-lyzed by the Gray Value Standard Deviation method and equivalent electrical model to obtain the discharge uniformity and electrical parameters.The results show that the uniformity of N2 DBD varies from non-uniform to uniform to non-uniform with increasing voltage amplitude or repetition frequency,and the N2 DBD with lower frequency requires higher voltage to achieve uniform discharge.Increasing the pulse rising/falling edge times leads to a significant decrease in discharge uniformity,and the rising time has a greater impact on the discharge uniformity than the falling time.The emission spectra are measured to compare the changes of chemically active species content under different nanosecond pulse parameters.It is found that increasing the voltage amplitude or repetition frequency enhances the spectral line inten-sity of each N2 particle.The increase of the pulse rising/falling edge times reduces the spectral line intensity of the main particle.This study reveals the influence mechanism of nanosecond pulse parameters on the N2 DBD process,which is conducive to the preparation of uniform,stable and highly active plasma sources at atmospheric pressure.
万方数据
维普
