Spatial distribution of active particles in pulsed driven plasma jet

To investigate the spatial distribution characteristics of active particles in atmospheric pressure pulse driven plasma jet, a coaxial double ring plasma jet reactor was used. Under external pulsed power excitation, the relative intensity changes of characteristic peaks of each active particle in different ionization regions along the axial space were studied. The results show that active particle characteristic peaks such as NO, OH, N₂, N₂⁺, He, can be detected at all measurement points of the pulse excited plasma jet, with the emission spectral bands and characteristic peaks corresponding to OH, N₂, N₂⁺ particles being more significant; In the upstream ionization section between the high-voltage electrode and the grounding electrode, the relative intensities of characteristic peaks of active particles NO, OH and N₂ are higher near the high-voltage electrode and grounding electrode, while lower in the middle of the upstream ionization section. The relative intensities of characteristic peaks of different levels of He and N₂⁺ gradually decrease along the airflow direction; In the midstream ionization section from the grounding electrode to the reactor nozzle, the axial distribution of relative intensities of active particles NO, OH and characteristic peaks of different energy levels N₂, N₂⁺ and He shows a gradually decreasing trend with the direction of the airflow; In the downstream ionization section from the reactor nozzle to the end of the plasma jet, the axial distribution of the relative intensity of the characteristic peaks of active particles OH and NO gradually weakens with the direction of gas flow. The relative intensity of the characteristic peaks of different energy levels N₂, N₂⁺ and He shows a pattern of first increasing and then decreasing, providing strong support for the in-depth study of the energy transfer process and reaction mechanism of pulse driven plasma jet.