A B C D E F G H I J K L M N O P R S T U V W Y Z
Numerische Simulation der Benzinselbstzündung
Dr. Thomas Breitenberger
Numerische Simulation der Benzinselbstzündung
Gegenstand der vorliegenden Arbeit ist die Entwicklung eines Verfahrens zur numerischen Simulation der Benzinselbstzündung. Neben der Berechnung nicht reagierender Strömungen mit bewegten und unbewegten Rechengittern wird eine pilotierte Methan-Luft-Strahlflamme simuliert. Darüber hinaus gibt die Arbeit einen Ausblick auf die Behandlung eines seriennahen Einzylinder-4-Takt-Ottomotors mit Direkteinspritzung im Betrieb mit Selbstzündung. Das entwickelte numerische Verfahren basiert auf einer zeitaufgelösten, dreidimensionalen Beschreibung der Gas- und der dispersen Phase mittels des ALE-Schemas im Kontext der Grobstruktursimulation. Der vorhandene Lösungsalgorithmus Kiva wurde zusätzlich zur Grobstruktursimulation mit dem Transport passiver und reagierender Skalare erweitert. Die chemischen Reaktionen werden mithilfe des FGM- oder des PV-Modells beschrieben. Das FGM-Modell bietet die Möglichkeit, nicht vorgemischte Flammen abzubilden, wohingegen das PV-Modell bei der Abbildung der Selbstzündprozesse zum Tragen kommt. Die aus den Untersuchungen hervorgehenden Ergebnisse stützen die Annahme, dass die Grobstruktursimulation ein hohes Potential zur Vorhersage innermotorischer Prozesse besitzt.
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