The Periodic Boundary Of Space Impact Of The Uniformity In Dielectric Barrier Discharge

The non-thermal equilibrium plasma produced in gas discharge at atmospheric pressure. Such a plasma can be applied to the field of material handling, pollution control, plasma-assisted airflow control or photonic crystals. There is a cutting-edge topic which is to be get the non-thermal equilibrium plasma which is a large area, stability and uniformity in atmospheric pressure. In this experiment, the time and space periodic boundary changed by using different stainless steel net and different layout, then studied on the impact of the uniformity in dielectric barrier discharge, lied the foundation for multi-scale effects in dielectric barrier discharge.Experiments showed that there was a inflection point in the changes of stainless steel net's spatial scale, the discharge was shown by the trend of non-uniform to uniform development, with the increased density of stainless steel net's spatial scale in a certain range. When the spatial scale of the stainless steel net reduced to a certain value, the discharge tend to the best uniform, and showed the characteristics of a glow discharge. However, when the spatial scale of the stainless steel net continued reducing, the discharge was shown by the trend of uniform to non-uniform development, finally, when the spatial scale of the stainless steel net tend to"infinite density"(similar to flat-panel),the discharge showed a characteristic of filament discharge.Experiments showed that the flow which formed by the discharge products would be generated in this process, and discharge filamented along the direction of the flow into the rules of radiation. Because air glow blown off the charged particles bombarding the dielectric and a lot of impurities in the discharge, leaving only the active particles which had a positive impact on the uniformity of the discharge. so the discharge patterns became stable ,dispersion and uniform. In addition, with the frequency gradually increased, the discharge showed a better and better uniformity in a certain range. In a word, high-frequency discharge lead to a more uniform discharge.Proposed a method which made use of FFT (Fast Fourier Transform)to study on the uniformity degree of discharge uniformity. Through the MATLAB software, transformed the discharge patterns with FFT, found that there was also an inflection point in the changes of stainless steel net's spatial scale. further evidenced the experimental conclusions. In addition, transformed the same pattern with different exposure time, found that accompanied by the exposure time increasing, uniformity of the discharge was getting better and better.