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Super-adiabatic flame temperatures in premixed methane-oxygen flames

Stelzner, Björn 1; Weis, Christof ORCID iD icon 2; Habisreuther, Peter ORCID iD icon 1; Zarzalis, Nikolaos 2; Trimis, Dimosthenis 2
1 Institut für Technische Chemie (ITC), Karlsruher Institut für Technologie (KIT)
2 Engler-Bunte-Institut (EBI), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Oxy-fuel combustion differs significantly from conventional air combustion. The absence of nitrogen leads to higher
flame temperatures and larger concentration of major species as well as intermediate species. In the present work,
freely propagating methane-oxygen flames were numerically calculated using a 1D model from lean to rich
conditions in order to investigate the appearance of super-adiabatic flame temperatures (SAFT). The calculations
were performed for equivalence ratios of 0.5 < Φ < 3.0 with an increment of 0.1, different inlet temperatures from
300 K to 700 K and a pressure range of 0.1 MPa to 1 MPa. Additionally, selected results were investigated with
different detailed chemical reaction mechanisms.
The results showed that the maximum flame temperature exceeds the equilibrium temperature for equivalence ratios
Φ > 0.9. Two different regimes were identified, where SAFT phenomenon appears. The first regime was found in
slightly rich conditions (1.0 < Φ < 2.1), whereas the second regime occurred in ultra-rich regime (Φ > 2.1).
A first maximum of temperature difference is observed at an equivalence ratio of Φ = 1.5. ... mehr

Postprint §
DOI: 10.5445/IR/1000146406
Veröffentlicht am 17.05.2022
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Institut für Technische Chemie (ITC)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 01.04.2015
Sprache Englisch
Identifikator ISBN: 978-963-12-1257-0
KITopen-ID: 1000146406
HGF-Programm 34.14.02 (POF III, LK 01) Vergasung
Erschienen in Proceedings of the European Combustion Meeting - 2015, March 30-April 2, 2015, Budapest, Hungary : ECM 2015
Veranstaltung 7th European Combustion Meeting (ECM 2015), Budapest, Ungarn, 30.03.2015 – 02.04.2015
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