不同电源激励Ar同轴介质阻挡放电特性对比

Atmospheric Ar coaxial dielectric barrier discharge (Ar DBD) has attracted significant interests in the field of energy and chemical engineering. In order to guide its configuration optimization and performance enhancement in practical applications, we systematically studied the discharge characteristics of Ar DBD driven by different power supplies including the electrical characteristics, optical characteristics, and operation temperature. Moreover, we compared the discharge uniformity, types and densities of active particles produced during discharge, and analyzed the discharge power and the energy utilization efficiency as well as reactor temperature and heat loss rate. The results show that the Ar DBD driven by ns pulse power supply shows more uniform discharge, higher density of active particles and higher energy utilization efficiency, compared with Ar DBD driven by high frequency alternating-current (AC) power supply and by µs pulse power supply under the same frequency. The ns pulse Ar DBD also has the lowest stable operation temperature, which results in the lowest heat loss rate. In an input voltage of 12 kV and a frequency of 4 kHz, the stable outer wall temperature and inner electrode temperature of the ns pulse Ar DBD are 109.9℃ and 227.9℃, respectively, while the corresponding temperature of the high frequency AC Ar DBD are 169.0℃ and 564.4℃. The high temperature condition will enhance the energy loss, which consequently lower the energy utilization efficiency. Under the same excitation conditions, the energy utilization efficiency of the ns pulse Ar DBD is 61.4%, which is significantly higher than that of the µs pulse Ar DBD (40.2%) and high frequency AC Ar DBD (24.1%). This work provides a useful reference for further promoting the application of Ar DBD in energy and chemical industry from the viewpoint of energy efficient utilization.