International Journal of Environmental Engineering and Development
E-ISSN: 2945-1159
Volume 3, 2025
Features of the Formation and Propagation of Plasma Diffuse Jets
Authors: , , ,
Abstract: Plasma diffuse jets (PDJ) with a length of over 100 cm were generated using a capacitive discharge in a quartz tube with ring electrodes. It was determined that the electrode installation location of ring electrodes does not affect the characteristics of PDJ in air and nitrogen. It was established that PDJ emissions primarily consist of the (1+) and (2+) nitrogen bands. When spectra were recorded in the interelectrode region, the (1−) nitrogen bands also appeared in the spectrum. At pressures below 0.1 Torr, spectral lines from the dissociation products of water vapor (CO, OH, and H) emerged, affecting the discharge plasma glow color. Spectra of PDJ were obtained at lower frequencies than those previously studied. At a frequency of 1 Hz, no discharge formation was observed. However, as the frequency increased to 1 kHz, PDJ began to form. It was found that the PDJ color was redder at negative voltage pulse polarity than at positive one, as confirmed by emission spectra from the diffuse jet body. It was shown that within the range of 3 to 21 cm from the outer edge of the ring electrode, the velocity of the first ionization wave (IW) propagating to the left of the electrodes was lower than that of the IW propagating to the right. This phenomenon is explained by a decrease in plasma potential with increasing distance from the high-voltage electrode due to the finite conductivity of the discharge plasma, as the registration region on the left was farther from the high voltage electrode than the corresponding region on the right.
Search Articles
Pages: 265-272
DOI: 10.37394/232033.2025.3.21