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Experimentelle Untersuchung der Selbstzündung von Kohlenwasserstoffen in nicht-vorgemischten...
Dr. Felix P. Eitel
Experimentelle Untersuchung der Selbstzündung von Kohlenwasserstoffen in...
Die Selbstzündung von Kohlenwasserstoffen in turbulenten Strömungsumgebungen spielt in vielen technischen Verbrennungssystemen eine Schlüsselrolle. So wird die Zündung in Diesel- oder HCCI-Motoren durch diese komplexen Prozesse gezielt eingeleitet und dient so millionenfach der individuellen Fortbewegung. Allerdings besitzen Selbstzündungsvorgänge auch als ungewollte Phänomene z. B. als Klopfen in Ottomotoren eine hohe Relevanz. Gegenstand der vorliegenden Arbeit ist die experimentelle Untersuchung der Selbstzündung von Kohlenwasserstoffen in turbulenten Strömungen mit dem Ziel diese raumzeitlich hochdynamischen Prozesse zu beschreiben und so ein tiefgreifendes Verständnis über sie zu erlangen. Die Durchführung dieser Analysen erfolgt an einem weltweit einmaligen Selbstzündungsprüfstand, dessen Randbedienungen sowie Betriebsparameter in dieser Arbeit detailliert beschrieben sind. Die weiteren Untersuchungen an den auftretenden Flammen zeigen eine Analyse der globalen Flammenstruktur in Abhängigkeit einer breiten Parametervariation sowie umfassende Analysen über die Entstehung und die zeitliche Entwicklung von Selbstzündungskernen im umgebenden Strömungsfeld Mittels kombinativer zeitaufgelöster Laserdiagnostik. Die Ergebnisse aller Untersuchungen bilden in ihrer Gesamtheit ebenfalls die Grundlage einer Validierungsdatenbank für numerische Simulationen von Selbstzündungsprozessen.
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