| Zugriffsnummer | 49466 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Schlieren imaging investigations of hot gas kernel expansion caused by slow contact break discharges |
| Autor(in); Institution |
Uber, Carsten; 3.6, Explosionsgeschützte Sensorik und Messtechnik, PTB-Braunschweig
Franke, Steffen; Leibniz-Institut für Plasmaforschung und Technologie, Greifswald, GERMANY
Uhrlandt, Dirk; Leibniz-Institut für Plasmaforschung und Technologie, Greifswald, GERMANY
|
| Quelle/Jahr | Proceedings of the 14th International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions:(2022), 477 - 487 |
| Availability | [online only] |
| DOI | |
| Verlag | PTB-Open Access Repository |
| Konferenzangaben | 14th International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions (ISHPMIE), Braunschweig, 11-15, July, 2022, Germany |
| Freie Schlagworte | Contact break discharges ; hot gas kernel ; schlieren imaging ; spark test apparatus ; metal vapor discharge |
| Zusammenfassung | In potentially explosive atmospheres, electric contact break discharges, which are typically generated at low voltages < 30 V and low currents in a range of 30 mA up to 80 mA, are a potential ignition source. Such locally small and fast discharges (typically 150 Jlm) generate a hot gas kernel relevant to the ignition process between electrodes in motion within 200 JlS and are dominated by metal vapor from the cadmium cathode. However, it is essential to understand the transition from a contact discharge to a hot gas kemel and then to a thermochemical ignition. This has not been sufficiently investigated so far. Schlieren imaging can be applied to study the hot gas kemel; however, this analysis of hot gas kemels here is demanding. Specifically, it requires good spatial resolution and sufficient time resolution (20 000 fps) while using a suitable parallellight beam. The test setup developed for this purpose will be described in this article. Moreover, examples ofthe expansion of a hot gas kemel with and without successful ignition will be shown. This includes an evaluation of the expansion dynamics and the dynamic evolution to power input. The aim is to draw conclusions on criteria that lead to ignition by investigating the processes of contact discharges that may or may not result in ignition. The results obtained will be integrated into a multi-physical model to assess potential ignition. |
| Kostenfreier Zugang | Open Access Gold |
| Rechteinformation | CC BY-ND 4.0 ; Creative Commons Attribution NoDerivatives 4.0 License |
Zitierung
Uber, C., Schüler, N., Franke, S., Hilbert, M., & Uhrlandt, D. (2022). Schlieren imaging investigations of hot gas kernel expansion caused by slow contact break discharges. 14th International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions (ISHPMIE), Braunschweig, 11-15, July, 2022, Germany. https://doi.org/10.7795/810.20221124