Investigation of the behavior of plasma jet in the presence of water under different grounded conditions

Abstract

AbstractPrevious researches have demonstrated that the ground electrode would influence the performance of the plasma jet. In this study, the characteristics of plasma jets underwater for different grounded conditions are investigated. The influence of airflow rate, and electrode length underwater are experimental studies. When the water is grounded, it would provide another charge channel for the discharge, much more ions would be transferred to the water. The length and discharge intensity would be enhanced. Besides, the length of electrode underwater would also influence the performance of the plasma jet. It is found that the shorter the electrode length, the larger the ratio of plasma jet length to electrode length. Furthermore, an electric diagram is promoted to explain the corresponding mechanism, by analyzing the resistance and capacitance under different working conditions, the theoretical explanation under different experimental working conditions is given, and further analysis demonstrated that the accumulation of charges in water during the discharge process would be the main reason to influence the propagation of plasma jet under water.