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Carrier-phase DNS study of particle size distribution effects on iron particle ignition in a turbulent mixing layer

Luu, T. D. 1; Shamooni, A.; Kronenburg, A.; Braig, D.; Mich, J.; Nguyen, B.-D.; Scholtissek, A.; Hasse, C.; Thäter, G. 2; Carbone, M.; Frohnapfel, B. ORCID iD icon 2; Stein, O. T. ORCID iD icon 1
1 Engler-Bunte-Institut (EBI), Karlsruher Institut für Technologie (KIT)
2 Institut für Strömungsmechanik (ISTM), Karlsruher Institut für Technologie (KIT)

Abstract:

The ignition and combustion of iron particles in a turbulent mixing layer is studied by means of three-dimensional carrier-phase direct numerical simulations (CP-DNS). A particular focus is set on particle size distribution (PSD) effects on the ignition behaviour by comparing CP-DNS results from using a realistic experimental PSD to DNS data based on a monodisperse (MD) particle cloud with the same equivalence ratio. The CP-DNS solves the Eulerian transport equations of the reacting gas phase and resolves all turbulent scales, while the particle boundary layers are modelled in the Lagrangian point-particle framework. A previously validated sub-model for the oxidation of iron to Wüstite (FeO) that accounts for both diffusion- and kinetically-limited combustion is employed. The mixing layer is initialised with an upper stream of air carrying cold iron particles and an opposed lower stream of hot air. Simulation results show distinct differences in the ignition behaviour between the MD and PSD cases. The ignition of the PSD case is delayed compared to the MD case and does not show any significant particle clustering prior to ignition. Further investigations indicate that the particle size has a crucial effect on the mixing process and ignition time. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000172397
Veröffentlicht am 11.07.2024
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Institut für Strömungsmechanik (ISTM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2024
Sprache Englisch
Identifikator ISSN: 1540-7489
KITopen-ID: 1000172397
HGF-Programm 38.05.01 (POF IV, LK 01) Anthropogenic Carbon Cycle
Erschienen in Proceedings of the Combustion Institute
Verlag Elsevier
Band 40
Heft 1-4
Seiten Art.-Nr.: 105297
Vorab online veröffentlicht am 24.06.2024
Nachgewiesen in Scopus
Web of Science
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