Generation of reactive atomic species of positive pulsed corona discharges in wetted atmospheric flows of nitrogen and oxygen |
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Authors: | Feng LIU Bo ZHANG Zhi FANG Wenchun WANG |
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Affiliation: | 1. College of Electrical Engineering and Control Science, Nanjing Tech University, Nanjing 211816,People's Republic of China;2. Key Lab of Materials Modification(Dalian University of Technology), Ministry of Education, Dalian 116024, People's Republic of China;School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024,People's Republic of China |
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Abstract: | The emission spectra of excited radicals (OH (A2∑),O (3p5 P),Hα (3P)) and emissive species (N2+ (B2∑u+),N2 (C3Hu)) produced by positive pulsed high-voltage needle-plane corona discharges in atmospheric N2 and O2 flows wetted with 10% H2O at 80 ℃ are used to investigate the relative concentrations of the produced radicals.The results indicate that the tendencies of the concentrations of radicals with discharge conditions are similar to each other due to their similar excitation processes by electron collision.The influence of oxygen flow mixed with the nitrogen flow on the emission intensities of O (3p5P → 3s5S20),Hα (3P → 2S),N2+ (B2∑u+ → X2Σg+ 0-0),and N2 (C3Πu → B3Πg 1-0) is presented.When the flow rate of oxygen addition is varied from 0-30 ml min-1,the emission intensities of O (3p5P → 3s5S20),Hα (3P → 2s),and N2+ (B2Σu+ → X2Σg+ 0-0) increase and reach a maximum.Then,if the oxygen flow rate increases further,the emission intensities tend to decrease.However,the intensity of N2 (C3Πu → B3Πg 1-0) decreases monotonously with the increasing oxygen flow,which indicates that the electron density decreases with the increasing oxygen flow.By the tendencies of the relative intensities to N2 (C3Πu → B3Πg 1-0),the concentrations of the total produced O,H,and N2+ are shown to increase with the oxygen flow.Based on the reactions for the production of H and O without and with the addition of O2,the analytic solutions for H and O production are derived in accordance with the experimental results. |
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Keywords: | pulsed positive corona discharge reactive atomic species needle-plane electrodes optical emission spectroscopy |
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