Post-breakdown dielectric recovery characteristics of High-pressure liquid CO2 including supercritical phase
Artykuł w czasopiśmie
MNiSW
25
Lista A
| Status: | |
| Autorzy: | Yang Zhibo, Hosseini S. Hamid R, Kiyan T., Gnapowski Sebastian, Akiyama Hidenori |
| Rok wydania: | 2014 |
| Wersja dokumentu: | Drukowana | Elektroniczna |
| Język: | angielski |
| Numer czasopisma: | 3 |
| Wolumen/Tom: | 21 |
| Strony: | 1089 - 1094 |
| Impact Factor: | 1,278 |
| Web of Science® Times Cited: | 12 |
| Scopus® Cytowania: | 15 |
| Bazy: | Web of Science | Scopus | Web of Science Core Collection |
| Efekt badań statutowych | NIE |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | NIE |
| Abstrakty: | angielski |
| The paper describes results of experimental studies to evaluate the effects of phase-change and/or density variation at the post-breakdown on the dielectric recovery characteristics of liquid and supercritical CO2. The study aims to explore the possibility of using supercritical CO2 to develop high-repetition-rate pulsed-power switches. The experimental setup consisted of a sphere-to-sphere 10 mm radius electrodes configuration with 50 mu m gap distance. Three phases of pressurized CO2; subcritical liquid state (SLS), liquid with pressure higher than critical point (LHCP), and supercritical phase (SC), were used for the experiments. Experimental results revealed that SC CO2 has a very short recovery time making it an appropriate fluid for MHz range highly-repetitive switches. Post-breakdown stage in SLS consisted of gas phase and liquid phase at the plasma channel between the electrodes, with the alternative expansion-contraction motion behavior of gas bubble determining dielectric recovery characteristics. Post-breakdown stages in SC were similar to those in LHCP, generating a low density region at the post-breakdown, where the state of density variation determined dielectric recovery characteristic. The low density region could be compressed by the surrounding medium, resulting in a considerably shorter recovery time. |
