Factor influencing on discharge characteristics of two-dimensional jet array in he at atmosphere pressure

In order to obtain jet plasma with large area, a stable two-dimensional plasma jet array discharge in He is generated at atmosphere pressure, and its lighting emission and electrical characteristics are investigated through emission images, voltage and current waveforms, and Lissajous figures. The influences of electrode structure, voltage amplitude, and gas volume flow rate on discharge characteristics, uniformity and length, and the key discharge parameters of discharge power and transported charges of the two-dimensional jet arrays are researched. The results show that the jet arrays with both the needle-ring and the needle-ring-plate electrode structures can produce homogeneous and stable plasmas with relative large area. The increasing of applied voltage amplitude has little effect on discharge uniformity, but can effectively improve the discharge power and jet length, thus improve the discharge strength of the jet arrays. The gas flow rate has a slight effect on discharge strength but has a remarkable influence on the discharge uniformity, and increasing the gas flow rate can improve the uniformity of the jet array. The electrode structure has a slight effect on discharge power and transported charge. In the case of small applied voltage amplitude and low gas flow rate, the introduction of the plate electrode in the needle-ring-plate electrode structure is benefit for obtaining the jets with longer length.