Comparative Study on Turbulent Flow Structure under Air, CO2 and SF6 Gas Blasting Visualized by Band-Pass Filtering Schlieren System

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Paper number
1845
Working Group Number
Conference name
CIRED 2019
Conference date
3-6 June 2019
Conference location
Madrid, Spain
Peer-reviewed
Yes
Short title
Convener
Authors
Inada, Yuki, Saitama University, Japan
Nagai, Hiroyuki, The University of Tokyo, Japan
Kumada, Akiko, The University of Tokyo, Japan
Hidaka, Kunihiko, The University of Tokyo, Japan
Demura, Yuki, Kanazawa University, Japan
Tabata, Yu, Kanazawa University, Japan
Tanaka, Yasunori, Kanazawa University, Japan
Nakano, Tomoyuki, Central Research Institute of Electric Power Industry, Japan
Abstract
Multi-directional turbulent structures were visualized for gas-blasted arc discharges under current-zero phases generated in a 50-mm-long interelectrode gap confined by a model gas flow nozzle, in order to conduct a systematic comparison of turbulent gas dynamics amongthreekinds of different arc-quenching gas media: air,CO2and SF6.Theturbulenceof all gases demonstrated hierarchical structures, where small turbulence in sizes of~10mm were distributed circularly and formed millimeter-scale large circles. The small turbulence in dimensions of 33-43mm was even stronger for SF6, compared with air and CO2. Further, the electron density imaging was complementally conductedin order to investigate the correlation between the turbulent dynamics and the electron density decaying process.The electron density for SF6 demonstrated the fastest decrease, which was followed by CO2 and air. A combination of the turbulent and electron density behavior suggested that the strongest small turbulence of SF6 could cause the cold gas mixing into the arc, which resulted in the rapid arc cooling and the fastest electron density reduction.
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Keywords
Publisher
AIM
Date
2019-06-03
Permanent link to this record
https://cired-repository.org/handle/20.500.12455/603
http://dx.doi.org/10.34890/826
ISSN
2032-9644
ISBN
978-2-9602415-0-1