TY - JOUR
T1 - Two-temperature thermodynamic and transport properties of C4F7N-CO2-O2 mixture as an arc-extinguishing gas
AU - Wang, Guanyu
AU - Zhang, Boya
AU - Cao, Minchuan
AU - Deng, Junwei
AU - Shi, Yuying
AU - Li, Bochen
AU - Li, Xingwen
AU - Murphy, Anthony B.
N1 - Publisher Copyright:
© 2025 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.
PY - 2025/4/21
Y1 - 2025/4/21
N2 - Given the significant greenhouse effect of SF6, the C4F7N-CO2-O2 mixture has been identified as one of the most promising eco-friendly arc-extinguishing gases. Switching arcs typically exhibit pronounced non-local thermodynamic equilibrium (NLTE) phenomena in the peripheral regions and at the current zero-crossing point, thereby influencing the thermophysical properties of the plasma. To investigate the impact of NLTE conditions, the thermodynamic properties and transport coefficients of two-temperature (2-T) C4F7N-CO2-O2 plasma were calculated under the local chemical equilibrium assumption. The results indicate that NLTE conditions significantly affect the properties of the mixture by altering its composition and particle energy, often having a more substantial impact than pressure variations. The generation of CO plays a critical role in shaping the thermodynamic and transport parameters of the plasma due to its molecular stability, particularly under non-equilibrium states. To maximise the arc-extinguishing performance of the gas, recommended oxygen mixing ratios are proposed. The results provide fundamental data for 2-T magnetohydrodynamic modelling of C4F7N gas mixtures in arc simulations.
AB - Given the significant greenhouse effect of SF6, the C4F7N-CO2-O2 mixture has been identified as one of the most promising eco-friendly arc-extinguishing gases. Switching arcs typically exhibit pronounced non-local thermodynamic equilibrium (NLTE) phenomena in the peripheral regions and at the current zero-crossing point, thereby influencing the thermophysical properties of the plasma. To investigate the impact of NLTE conditions, the thermodynamic properties and transport coefficients of two-temperature (2-T) C4F7N-CO2-O2 plasma were calculated under the local chemical equilibrium assumption. The results indicate that NLTE conditions significantly affect the properties of the mixture by altering its composition and particle energy, often having a more substantial impact than pressure variations. The generation of CO plays a critical role in shaping the thermodynamic and transport parameters of the plasma due to its molecular stability, particularly under non-equilibrium states. To maximise the arc-extinguishing performance of the gas, recommended oxygen mixing ratios are proposed. The results provide fundamental data for 2-T magnetohydrodynamic modelling of C4F7N gas mixtures in arc simulations.
KW - CFN
KW - arc
KW - non-equilibrium plasma
KW - thermodynamic properties
KW - transport coefficients
KW - two temperature model
UR - https://www.scopus.com/pages/publications/86000753443
U2 - 10.1088/1361-6463/adbcbd
DO - 10.1088/1361-6463/adbcbd
M3 - 文章
AN - SCOPUS:86000753443
SN - 0022-3727
VL - 58
JO - Journal of Physics D: Applied Physics
JF - Journal of Physics D: Applied Physics
IS - 16
M1 - 165502
ER -