In this study, we examined the key particles and chemical reactions that substantially influence plasma characteristics. In summarizing the chemical reaction model for the discharge process of N_(2)–O_(2)–H_(2)O(g)m...In this study, we examined the key particles and chemical reactions that substantially influence plasma characteristics. In summarizing the chemical reaction model for the discharge process of N_(2)–O_(2)–H_(2)O(g)mixed gases, 65 particle types and 673 chemical reactions were investigated. On this basis, a global model of atmospheric pressure humid air discharge plasma was developed, with a focus on the variation of charged particles densities and chemical reaction rates with time under the excitation of a 0–200 Td pulsed electric field. Particles with a density greater than 1% of the electron density were classified as key particles. For such particles, the top ranking generation or consumption reactions(i.e. where the sum of their rates was greater than 95% of the total rate of the generation or consumption reactions) were classified as key chemical reactions. On the basis of the key particles and reactions identified, a simplified global model was derived. A comparison of the global model with the simplified global model in terms of the model parameters, particle densities, reaction rates(with time), and calculation efficiencies demonstrated that both models can adequately identify the key particles and chemical reactions reflecting the chemical process of atmospheric pressure discharge plasma in humid air. Thus, by analyzing the key particles and chemical reaction pathways, the charge and substance transfer mechanism of atmospheric pressure pulse discharge plasma in humid air was revealed, and the mechanism underlying water vapor molecules’ influence on atmospheric pressure air discharge was elucidated.展开更多
The characteristics of positive corona discharge of rod electrode in high-speed airflow are studied in this paper.The experiments were carried out in a wind tunnel with a maximum flow speed of 100 m/s in a dark room.T...The characteristics of positive corona discharge of rod electrode in high-speed airflow are studied in this paper.The experiments were carried out in a wind tunnel with a maximum flow speed of 100 m/s in a dark room.The discharge voltage and current were recorded and the corona patterns were captured by a digital single lens reflex(DSLR)camera during the experiment.A discharge transition in rod electrode from streamer corona to mixed streamer-glow corona,and finally to stable glow discharge was observed with the voltage increased.The increase of airflow speed resulted in a decrease of each corona inception voltages.The streamers will be suppressed and shifted towards the upwind side,while the glow layer will be promoted and shifted towards the downwind side in low and upwind side in high voltages.The glow corona current and the voltage show a quadratic function and the higher the airflow speeds,the bigger the coefficient of square of voltage.The distributions of peaks,pulse widths and interval times of streamer pulses were analysed,showing good correspondence with the streamer images.The measurements were explained by combining particle transport and local air pressure distribution.展开更多
基金supported by National Natural Science Foundation of China(No.51907145)。
文摘In this study, we examined the key particles and chemical reactions that substantially influence plasma characteristics. In summarizing the chemical reaction model for the discharge process of N_(2)–O_(2)–H_(2)O(g)mixed gases, 65 particle types and 673 chemical reactions were investigated. On this basis, a global model of atmospheric pressure humid air discharge plasma was developed, with a focus on the variation of charged particles densities and chemical reaction rates with time under the excitation of a 0–200 Td pulsed electric field. Particles with a density greater than 1% of the electron density were classified as key particles. For such particles, the top ranking generation or consumption reactions(i.e. where the sum of their rates was greater than 95% of the total rate of the generation or consumption reactions) were classified as key chemical reactions. On the basis of the key particles and reactions identified, a simplified global model was derived. A comparison of the global model with the simplified global model in terms of the model parameters, particle densities, reaction rates(with time), and calculation efficiencies demonstrated that both models can adequately identify the key particles and chemical reactions reflecting the chemical process of atmospheric pressure discharge plasma in humid air. Thus, by analyzing the key particles and chemical reaction pathways, the charge and substance transfer mechanism of atmospheric pressure pulse discharge plasma in humid air was revealed, and the mechanism underlying water vapor molecules’ influence on atmospheric pressure air discharge was elucidated.
基金National Natural Science Youth Foundation of China,Grant/Award Number:52207168National Natural Science Foundation of China,Grant/Award Number:52377154。
文摘The characteristics of positive corona discharge of rod electrode in high-speed airflow are studied in this paper.The experiments were carried out in a wind tunnel with a maximum flow speed of 100 m/s in a dark room.The discharge voltage and current were recorded and the corona patterns were captured by a digital single lens reflex(DSLR)camera during the experiment.A discharge transition in rod electrode from streamer corona to mixed streamer-glow corona,and finally to stable glow discharge was observed with the voltage increased.The increase of airflow speed resulted in a decrease of each corona inception voltages.The streamers will be suppressed and shifted towards the upwind side,while the glow layer will be promoted and shifted towards the downwind side in low and upwind side in high voltages.The glow corona current and the voltage show a quadratic function and the higher the airflow speeds,the bigger the coefficient of square of voltage.The distributions of peaks,pulse widths and interval times of streamer pulses were analysed,showing good correspondence with the streamer images.The measurements were explained by combining particle transport and local air pressure distribution.
