دورية أكاديمية
Spectral and electric diagnostics of low-current arc plasmas in CO2 with N2 and H2O admixtures
| العنوان: | Spectral and electric diagnostics of low-current arc plasmas in CO2 with N2 and H2O admixtures |
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| المؤلفون: | Becerra, Marley, Nilsson, Janne, Franke, Steffen, Breitkopf, Cornelia, André, Pascal |
| المساهمون: | KTH Royal Institute of Technology Kista (KTH), Leibniz Institute for Plasma Science and Technology (INP), Leibniz Association, Department of Physics TU Dresden, Technische Universität Dresden = Dresden University of Technology (TU Dresden), Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA) |
| المصدر: | ISSN: 0022-3727 ; EISSN: 1361-6463. |
| بيانات النشر: | HAL CCSD IOP Publishing |
| سنة النشر: | 2024 |
| المجموعة: | HAL Clermont Auvergne (Université Blaise Pascal Clermont-Ferrand / Université d'Auvergne) |
| مصطلحات موضوعية: | [SPI.PLASMA]Engineering Sciences [physics]/Plasmas, [PHYS]Physics [physics] |
| الوصف: | International audience ; Plasma diagnostics is a key tool to support the further development of plasma-induced chemical conversion of greenhouse gases (such as CO 2 ) into high-value chemicals. For this reason, spectroscopic and electric measurements of low current (below 1.7 A), stationary arc plasmas in CO 2 at atmospheric pressure with addition of N 2 or H 2 O are reported. High-speed photography, imaging emission spectroscopy and time-resolved electrical measurements are used to obtain time-space resolved gas temperatures as well as the electric-field current characteristics of the discharge. It is found that the lowest average electric field in a CO 2 arc plasma at atmospheric pressure is ∼20 kV mm −1 at a current between 0.8 and 1 A. If the current decreases below this level, the arc remains in vibrational–translational (VT) equilibrium by increasing the electric field. However, VT equilibrium conditions can be only maintained until a threshold minimum current of 0.33 ± 0.05 A, at which the arc transitions into a non-equilibrium condition with further increasing electric fields (reaching 68 ± 15 V mm −1 at 0.03 A). The addition of N 2 or H 2 O did not influence the electrical characteristics of the CO 2 arc within to the tested mixtures. However, there is only a significant decrease in the electric field of the formed transition arcs and the threshold minimum current in the presence of N 2 . The spectra of the low-current CO 2 arc is found to be dominated by emission from the C 2 Swan band system and the O I 777 nm triplet peak. However, the CN band dominates the spectra even when small amounts (0.5 wt%) of N 2 is present in the plasma. The gas temperature at the axis of the CO 2 arc plasma decreased slightly with decreasing current, from an estimated 7000 K at 1 A down to 6300 K at 0.4 A. The thermal radius of the arc is estimated to be larger than 1.2 mm, more than two times larger than the optical radius obtained from the emitted radiation. The addition of N 2 and H 2 O (up to 7 and 9 wt% respectively) ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | hal-04232661; https://hal.science/hal-04232661Test; INSPIRE: 2766378 |
| DOI: | 10.1088/1361-6463/acfcc6 |
| الإتاحة: | https://doi.org/10.1088/1361-6463/acfcc6Test https://hal.science/hal-04232661Test |
| رقم الانضمام: | edsbas.26E54DF7 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1088/1361-6463/acfcc6 |
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