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Experimentelle Untersuchung der turbulenten Flamme-Wand-Interaktion
Dr. Christopher Jainksi
Experimentelle Untersuchung der turbulenten Flamme-Wand-Interaktion
In vielen technischen Anwendungen wie Verbrennungsmotoren oder Gasturbinenbrennkammern findet eine Interaktion zwischen Flamme und Brennraumwänden statt. In diesen Bereichen kann es durch einen starken Enthalpieentzug in der Flamme zu einer unvollständigen Verbrennung mit einer erhöhten Schadstoffbildung und verringerter Effizienz kommen. Ein vollständiges Verständnis der dabei ablaufenden Flamme-Wand-Interaktion (FWI) ist bis heute nicht gegeben und somit Gegenstand der aktuellen Forschung. Im Rahmen dieser Arbeit werden deshalb die der FWI zugrunde liegenden Prozesse untersucht. Dabei kommen zwei generische Brenneraufbauten mit definierten und kontrollierten Randbedingungen zum Einsatz. Diese bilden die beiden Grundformen des senkrechten und parallelen Flammenverlöschens der FWI ab. Zur Untersuchung werden modernste laserdiagnostische Verfahren verwendet und an die speziellen Gegebenheiten von wandnahen reagierenden Strömungen angepasst. Der Fokus liegt dabei auf einer nicht-intrusiven Messung von Strukturen mit kleinsten Zeit- und Längenskalen. Ziel der Arbeit ist es neben dem Erlangen eines tieferen Verständnisses der zugrunde liegenden Prozesse, eine Datenbasis für die Validierung von numerischen Modellen zu schaffen.
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