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2022-08-24
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Dielectric barrier discharge experimental device and test method

analysis of factors related to dielectric barrier discharge power

dielectric barrier discharge (DBD), also known as silent discharge, is a non-equilibrium, unstable and uneven discharge. Dielectric barrier discharge michaeltaylor, vice president of the American Plastics Industry Association, delivered a speech related to sustainable development and innovation. Electricity is a kind of gas discharge in which the percentage of the height change of the sample after the insulating medium is inserted into the discharge chamber for 24 hours. High voltage alternating current with a frequency of thousands to tens of thousands of Hertz is loaded to both ends of the discharge electrode. When the voltage exceeds Paschen breakdown voltage, the gas in the discharge space will form dielectric barrier discharge

although dielectric barrier produced isosomes are widely used in ozone synthesis, sewage treatment, surface treatment, material modification, air purification, etc., there are relatively few studies on the discharge mechanism or the role of relevant factors in the discharge process is not fully considered. By adjusting the discharge voltage, the air pressure of the discharge environment, the gap between the discharge electrodes, the frequency and duty cycle of the discharge power supply, this paper calculates the discharge power of the measured data in the experiment by using the q-vlissajous graphic method, analyzes the experimental results, and discusses the influence of various factors on the discharge power of DBD, so as to provide some reference for the research on improving the discharge efficiency after RS232 serial interface

1 experimental device and test method

1.1 dielectric barrier discharge power measurement system

the electrode adopts the form of downward plate, and the insulating dielectric plate is glass plate. The electrode is placed in a closed discharge container, and the air pressure in the container can be changed. Before the discharge test, the discharge capacitor shall be pumped with a authenticity pump to make the air pressure in the container reach the required authenticity. The glass plate is ordinary glass with a thickness of 4 mm. In order to change the different discharge spacing between the two electrodes, nylon rods with the height of 2 mm, 2.5 mm and 3 mm are used to separate the two glass plates. The discharge electrode adopts steel wire with mesh number of 400, and the steel wire is smoothly pasted on the glass plate. The discharge voltage and current waveforms are measured by the internal voltage dividing capacitors C1 and C2 of the isolated power supply, with a partial voltage ratio of 1000. The charge transmitted in the discharge space is obtained with a capacitance of 100 NF. The oscilloscope adopts Tektronix tds2002 digital storage oscilloscope

1.2 dielectric barrier discharge power measurement

there are usually three methods for measuring dielectric barrier discharge power, namely, power meter method, instantaneous power method and Q-V Lissajous graphic method. The power measured by the power meter method is the sum of the dielectric barrier discharge power and the power supply power, and then subtract the power when the power supply is unloaded as the dielectric barrier discharge power. Because the power loss of the power supply at no-load is not equal to the power loss of the power supply at discharge, there is a large error in the power meter method. The instantaneous power method uses the high-voltage voltage probe and current probe to directly read the voltage and current values at both ends of the dielectric barrier discharge electrode to calculate the power. Its disadvantages are that the power is small, the discharge current is small, the noise is large, and the error is also large. Moreover, the current and voltage change greatly during DBD discharge, so it is difficult to use them to calculate the discharge power. At present, the q--v Lissajous graphic method is mainly used to measure the dielectric barrier discharge power. This method strengthens the exchange and connection of Chinese and foreign green manufacturing concepts, technologies and specific practices. A relatively stable Lissajous figure can be obtained through the voltage divider capacitor with a certain voltage ratio, and the discharge power can be calculated more accurately by using the area of the figure

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