Simulation of Nitrogen Spark Discharge Characteristics Under Continuous Nanosecond Pulse at Atmospheric Pressure

Abstract

The physical and chemical process of spark discharge sustained by repetitively high-voltage nanosecond pulses is complicated, and it is usually necessary to consider the gas expansion caused by heating, and the residual charged particles in the space have a significant impact on the establishment of the subsequent discharge spark channel. Based on the fluid model, aerodynamic model, and the impedance of the external circuit, this paper establishes a one-dimensional spark discharge calculation model sustained by repetitively high-voltage nanosecond pulses to simulate the development process of the spark discharge of the flat electrode structure. The simulation study the spark discharge characteristics under continuous three nanosecond pulses, the research found that the residual charge equalizes the space charge, resulting in the uniform development of the subsequent discharge, and the time of spark channel establishment is shorter. During stable spark discharge stage, the electric current waveform is basically the same. The energy deposited into the channel by a single pulse discharge is about 14 mJ, the gas temperature rises by about 300K, and the energy and temperature do not reach dynamic equilibrium under continuous three nanosecond pulses.KeywordsNanosecond repetitively pulseFluid modelSpark dischargeGas heating