The Influence of Air Flow Rates and Voltage on the Plasma Emission Spectra and the Concentrations of Nitrogen Oxides Produced by Gliding Arc Discharge Plasma
In this work, gliding arc discharge (GAD) was used to produce air plasma and investigate the influence of the discharge parameters on the composition of the air plasma, vibrational temperatures, and the production of NO<sub>x</sub>. It was demonstrated that the main particles obtained in...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/15/1/446 |
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| Summary: | In this work, gliding arc discharge (GAD) was used to produce air plasma and investigate the influence of the discharge parameters on the composition of the air plasma, vibrational temperatures, and the production of NO<sub>x</sub>. It was demonstrated that the main particles obtained in the GAD air plasma were N<sub>2</sub>*, N<sub>2</sub><sup>+</sup>, N<sup>+</sup>, NO<sub>γ</sub>, and O. It was observed that the reduction in the discharge frequency increased the intensity of the excited nitrogen molecules lines and reduced the nitric oxide (NO) and nitrogen dioxide (NO<sub>2</sub>) gas concentrations. The increase in the output voltage prolonged the duration of arc discharge and enhanced the intensities of the emission lines of the N<sub>2</sub><sup>+</sup>, O, and NO<sub>γ</sub> species and the concentrations of NO and NO<sub>2</sub> gasses. It was shown that the increase in the air flow rate from 6.7 L/min to 15.6 L/min decreased the concentration of the produced NO gas by 24%. Additionally, the line intensities of all main species in air plasma were enhanced. Studies have shown that the NO and NO<sub>2</sub> gas concentrations (selectivity of NO and NO<sub>2</sub>) can be controlled by varying the air flow, output voltage, and discharge frequency. The highest NO<sub>x</sub> concentration of 2380 ppm was produced at 250 V, when the direct air flow was 11.2 L/min. |
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| ISSN: | 2076-3417 |