| Zugriffsnummer | 43548 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | Experimental investigation of the stochastic early flame propagation after ignition by a low-energy electrical discharge |
| Autor(in); Institution |
Essmann, Stefan; 3.5, Explosionsschutz in der Energietechnik, PTB-Braunschweig
Markus, Detlev; 3.5, Explosionsschutz in der Energietechnik, PTB-Braunschweig
Grosshans, Holger; 3.5, Explosionsschutz in der Energietechnik, PTB-Braunschweig
Maas, Ulrich; Institut für Technische Thermodynamik, Karlsruher Institut für Technologie, Karlsruhe, GERMANY
|
| Quelle/Jahr | Combustion and Flame: 211 (2020), 44 - 53 |
| ISSN | 0010-2180 (PRINT) ; 1556-2921 (ONLINE) |
| DOI | |
| Verlag | Amsterdam: Elsevier |
| Freie Schlagworte | Spark ignition ; Minimum ignition energy ; Lewis number ; High-speed schlieren |
| Zusammenfassung | In the context of explosion protection, very conservative safety factors need to be considered, e.g. in the design of electrical devices. This is due to standards which are mainly based on empirical data as opposed to a detailed knowledge of the underlying physiochemical processes. In this work, the early phase of ignition of burnable gas mixtures close to their respective minimum ignition energy is investigated experimentally by means of high-speed schlieren imaging. Our data quantifies how the ignition process at such low energies becomes less repeatable which is evidenced by a high scattering of the flame propagation. It was found that, depending on the mixture, the flow field induced by the electrical discharge may exhibit a considerable effect on the ignition process. This effect is more pronounced for mixtures which are characterized by a large Lewis number, thus, leading to a more random flame propagation. |
| Kostenfreier Zugang | Open Access Hybrid |
| Rechteinformation | CC BY-NC-ND 4.0 ; Creative Commons Attribution NonCommercial NoDerivatives 4.0 License |
| Themenbereich der Metrologie | Physikalische Sicherheitstechnik, Explosionsschutz |
| Forschungsprojekt | FOR 1447: Physicochemical-based Models for the Prediction of safety-relevant Ignition Processes |
| Förderinformationen (1) |
Förderername: Deutsche Forschungsgemeinschaft (DFG)
Förderer ID: 0000 0001 2096 9829 Förderer ID Typ: ISNI Förderprogramm: Forschungsgruppe Titel der Förderung: FOR 1447: Physicochemical-based Models for the Prediction of safety-relevant Ignition Processes Förderungsnummer: 163557763 URI der Förderung: http://gepris.dfg.de/gepris/projekt/163557763 |