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Numerical thermofluid simulation of a decaying arc behavior in CO 2 /O 2 /C 5 F 10 O (C5‐PFK) considering more than nona‐atomic molecules
Author(s) -
Demura Yuki,
Tanaka Yasunori,
Uesugi Yoshihiko,
Ishijima Tatsuo
Publication year - 2019
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.23018
Subject(s) - arc (geometry) , nozzle , work (physics) , chemistry , molecule , thermodynamics , circuit breaker , physics , analytical chemistry (journal) , geometry , mathematics , organic chemistry , quantum mechanics , chromatography
The present article describes numerical thermofluid simulation results on decaying arc behavior in 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5‐PFK) gas considering molecules constituted with more than 9 atoms in a nozzle space on the assumption of local thermodynamic equilibrium (LTE) condition. The gas mixture 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5‐PFK) is one of the candidate alternatives for SF 6 in a gas circuit breaker. First, we calculated 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5‐PFK) arc characteristics only by considering less than 8‐atom molecules. However, it seems possible to produce more than nona‐atomic molecules in the low‐temperature region in 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5‐PFK) arcs. The present work further calculated the equilibrium composition of this gas mixture at 0.1 MPa with taking account more than nona‐atomic molecules. Furthermore, their thermodynamic and transport properties were also computed with collision integrals between species considered. Using these properties, the arc temperature and gas flow fields were calculated using two‐dimensional LTE model for a free recovery condition from dc 50 to 0 A. Results showed that a similar temperature decay was obtained for arcs in the 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5‐PFK) gas mixture to that for arcs in 100%CO 2 gas. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.