Untersuchung transitionaler Grenzschichtstromungen mit Berucksichtigung der Freistromturbulenz und der spektralen Turbulenzverteilung

By (author) Holger Albiez

Book cover: Untersuchung transitionaler Grenzschichtstromungen mit Berucksichtigung der Freistromturbulenz und der spektralen Turbulenzverteilung

Extent: 219 pages

Publisher: Logos Verlag Berlin

Subjects: Technical Sciences: Computer Science, Engineering, IT, & Math

Language: German

Paperback (Published)

(February 2023)

ISBN: 9783832556082

6.65 x 9.45 inches

Price: $63.00

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Die Forderung nach immer effizienteren Antrieben in der Luftfahrt und steigenden Wirkungsgraden von stationaren Gasturbinen erfordert weitere Verbesserungen bei der Auslegung der Turbinenschaufeln. Ein grosses Potential ist hier bei der Vorhersage des laminar-turbulenten Ubergangs vorhanden, da durch eine Verringerung der damit verbundenen Unsicherheit und eine prazisere Auslegung Kuhlluft eingespart werden kann. In dieser Arbeit wird deshalb ein neuer Prufstand vorgestellt, mit dem eine breite experimentelle Datenbasis geschaffen wird, die zu Modellierungszwecken genutzt werden kann. Erstmals wird gezielt neben der Turbulenzintensitat auch die spektrale Grossenverteilung der Turbulenzwirbel variiert, wodurch die Einflusse beider Parameter herausgestellt werden. Mit den Messdaten lasst sich ein signifikanter Einfluss der turbulenten Langenmasse auf die Starstelle der Transition darstellen. Die Entwicklung einer neuen Messtechnik mit traversierbaren Heissfilmsensoren erlaubt eine bedeutende Steigerung der raumlichen Messauflosung bei dieser Messtechnik. Diese Technik eroffnet erstmals die Moglichkeit, den Bereich, in dem Turbulenzflecken entstehen, unter fur Turbinen typischen Randbedingungen detailliert zu analysieren. Im Anschluss an die experimentelle Untersuchung wird ein erster Modellierungsansatz fur transitionale Grenzschichtstromungen vorgestellt, der sich durch separate Betrachtung der Produktionsrate und der Ausbreitungsparameter von Turbulenzflecken von herkommlichen Modellen unterscheidet.

  • By (author) Holger Albiez

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