Energy efficiency limits the application of atmospheric pressure dielectric barrier discharge(DBD),such as air purification,water treatment and material surface modification.This article focuses on the electrical and ...Energy efficiency limits the application of atmospheric pressure dielectric barrier discharge(DBD),such as air purification,water treatment and material surface modification.This article focuses on the electrical and optical effects of the DBD under three square wave pulses polarities-positive,negative and bipolar.The result shows that under the same voltage with the quartz glass medium,the discharge efficiency of bipolar polarity pulse is the highest due to the influence of deposited charge.With the increase of air gap distance from 0.5 to 1.5 mm,average power consumed by the discharge air gap and discharge efficiency decrease obviously under alumina,and increase,and then decrease under quartz glass and polymethyl methacrylate(PMMA).Through spectrum diagnosis,in the quartz glass medium,the vibration temperature is the highest under negative polarity pulse excitation.Under bipolar pulse,the vibration temperature does not change significantly with the change of air gap distance.For the three dielectric materials of quartz glass,alumina and PMMA,the molecular vibration temperature is the highest under the quartz glass medium with the same voltage.When the gap spacing,pulse polarity or dielectric material are changed,the rotational temperature does not change significantly.展开更多
Most reactors for non‐thermal plasma excitation are capacitive to pulse generators.The density and temperature of electrons in plasma are dominated by the discharging currents which are proportional to the pulse edge...Most reactors for non‐thermal plasma excitation are capacitive to pulse generators.The density and temperature of electrons in plasma are dominated by the discharging currents which are proportional to the pulse edges.However,adjusting the pulse edges is quite challenging since the switching speed and the inductance and capacitance in the discharging loops dominate them.This study proposes a drive circuit for solid‐state Marx generators with adjustable edges.The drive circuit controls the Miller plateau by adjusting the gate voltage amplitude to adjust both the rise time and fall time of pulses continuously and independently.The influence of the gate voltage on the Miller plateau and the rise time is studied.The feasibility is verified by both simulating and experimental results.An 8‐stage solid‐state Marx generator prototype was built,and 4.8‐kV pulses with a rise time in the range of 79 ns‐22.21μs were obtained over capacitive loads.Adjusting pulse edges can control the current amplitudes in dielectric barrier discharge loads.展开更多
基金supported by Shanghai Sailing Program(No.19YF1435000)National Natural Science Foundation of China(Nos.51707122 and 12005128)。
文摘Energy efficiency limits the application of atmospheric pressure dielectric barrier discharge(DBD),such as air purification,water treatment and material surface modification.This article focuses on the electrical and optical effects of the DBD under three square wave pulses polarities-positive,negative and bipolar.The result shows that under the same voltage with the quartz glass medium,the discharge efficiency of bipolar polarity pulse is the highest due to the influence of deposited charge.With the increase of air gap distance from 0.5 to 1.5 mm,average power consumed by the discharge air gap and discharge efficiency decrease obviously under alumina,and increase,and then decrease under quartz glass and polymethyl methacrylate(PMMA).Through spectrum diagnosis,in the quartz glass medium,the vibration temperature is the highest under negative polarity pulse excitation.Under bipolar pulse,the vibration temperature does not change significantly with the change of air gap distance.For the three dielectric materials of quartz glass,alumina and PMMA,the molecular vibration temperature is the highest under the quartz glass medium with the same voltage.When the gap spacing,pulse polarity or dielectric material are changed,the rotational temperature does not change significantly.
基金National Key R&D plan of China,Grant/Award Number:2019YFC0119102。
文摘Most reactors for non‐thermal plasma excitation are capacitive to pulse generators.The density and temperature of electrons in plasma are dominated by the discharging currents which are proportional to the pulse edges.However,adjusting the pulse edges is quite challenging since the switching speed and the inductance and capacitance in the discharging loops dominate them.This study proposes a drive circuit for solid‐state Marx generators with adjustable edges.The drive circuit controls the Miller plateau by adjusting the gate voltage amplitude to adjust both the rise time and fall time of pulses continuously and independently.The influence of the gate voltage on the Miller plateau and the rise time is studied.The feasibility is verified by both simulating and experimental results.An 8‐stage solid‐state Marx generator prototype was built,and 4.8‐kV pulses with a rise time in the range of 79 ns‐22.21μs were obtained over capacitive loads.Adjusting pulse edges can control the current amplitudes in dielectric barrier discharge loads.
