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Statistische Analyse von Skalardaten einer turbulenten Vormischflamme
Dr. Thabo Stadler
Statistische Analyse von Skalardaten einer turbulenten Vormischflamme
Gegenstand der Arbeit ist die detaillierte statistische Analyse von stratifizierten und gescherten Flammen. Hierzu wird ein generischer vorgemischter, pilotierter Brenner verwendet, der durch zwei voneinander unabhängige Ringspalte eine Stratifizierung und Scherung der austretenden Brennstoff-Oxidator-Mischungen ermöglicht. Damit die auftretenden Prozesse unbeeinflusst bleiben, werden laserbasierte Methoden zur Untersuchung dieser eingesetzt. Die detaillierte Charakterisierung des Brenners wird zum einen mittels Thermographischer Phosphore durchgeführt, um die Wandtemperaturen zu eruieren. Zur simultanen Bestimmung von Konzentrationen und Temperatur wird die kombinierte Raman-/Rayleigh-Spektroskopie verwendet. Neben der Bestimmung von Mittelwert und Standardabweichung wird mithilfe des crossed planar Rayleigh imagings die Flammenausbreitungsrichtung gemessen. Dies ermöglicht eine Korrektur der errechneten Temperatur und Konzentration entlang der Ausbreitungsrichtung der Flamme. Die Aufnahme besonders hoher Statistiken gibt so einen Einblick in den Effekt der Stratifizierung und Scherung auf das Verhalten der Flammen. Die Ergebnisse der gezeigten Untersuchungen werden als Datenbasis für die Validierung numerischer Simulationen verwendet.
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