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http://dx.doi.org/10.18419/opus-13114
Autor(en): | Straub, C. Kronenburg, A. Stein, O. T. Galindo-Lopez, S. Cleary, M. J. |
Titel: | Mixing time scale models for multiple mapping conditioning with two reference variables |
Erscheinungsdatum: | 2020 |
Dokumentart: | Zeitschriftenartikel |
Seiten: | 1143-1166 |
Erschienen in: | Flow, turbulence and combustion 106 (2021), S. 1143-1166 |
URI: | http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-131330 http://elib.uni-stuttgart.de/handle/11682/13133 http://dx.doi.org/10.18419/opus-13114 |
ISSN: | 1386-6184 1573-1987 |
Zusammenfassung: | A novel multiple mapping conditioning (MMC) approach has been developed for the modelling of turbulent premixed flames including mixture inhomogeneities due to mixture stratification or mixing with the cold surroundings. MMC requires conditioning of a mixing operator on characteristic quantities (reference variables) to ensure localness of mixing in composition space. Previous MMC used the LES-filtered reaction progress variable as reference field. Here, the reference variable space is extended by adding the LES-filtered mixture fraction effectively leading to a double conditioning of the mixing operator. The model is used to predict a turbulent stratified flame and is validated by comparison with experimental data. The introduction of the second reference variable also requires modification of the mixing time scale. Two different mixing time scale models are compared in this work. A novel anisotropic model for stratified combustion leads to somewhat higher levels of fluctuations for the passive scalar when compared with the original model but differences remain small within the flame front. The results show that both models predict flame position and flame structure with good accuracy. |
Enthalten in den Sammlungen: | 04 Fakultät Energie-, Verfahrens- und Biotechnik |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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s10494-020-00188-0.pdf | 3,04 MB | Adobe PDF | Öffnen/Anzeigen |
Diese Ressource wurde unter folgender Copyright-Bestimmung veröffentlicht: Lizenz von Creative Commons