Research on the Influence of Air Pressure and Mixture Concentration on the Discharge Characteristics of High-Frequency nSDBD

High-frequency nanosecond surface dielectric barrier discharge (nSDBD) has great potential as a large-area ignition method. Compared with single-pulse nSDBD, high-frequency nSDBD is more easily adjustable in terms of discharge energy, which can be used to control the ignition process. To facilitate the implementation of high-frequency nSDBD in internal combustion engine ignition control, further research is needed to investigate the characteristics of nSDBD in high-pressure fuel-air mixtures. In this paper, discharge experiments of high-frequency nSDBD were carried out in a constant-volume combustion chamber. The discharge characteristics were tested under different gas pressures and excess air ratios. The experimental results show that the discharge energy decreases with increasing gas pressure and increasing concentration of the gas mixture. Reducing the thickness of the insulating dielectric can enhance the discharge intensity and suppress the decay of discharge energy with increasing gas pressure.