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Experimentelle Untersuchungen an Einem Niederdruckturbinenprofil Mit Druckseitiger Ablosung

Experimentelle Untersuchungen an Einem Niederdruckturbinenprofil Mit Druckseitiger Ablosung

          
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About the Book

Gasturbinen dominieren den Markt der Luftfahrtantriebe aufgrund ihrer einzigartigen Leistungsdichte und ihrer Effizienz. Diese Eigenschaften bedingen jedoch enorme mechanische und thermische Belastungen der Turbinenkomponenten, welche eine aufwandige Kuhlung der thermisch belasteten Bauteile erzwingen. Die Kuhlung der Bauteile erfolgt dabei konvektiv oder als Filmkuhlung unter Verwendung von komprimierter Luft, welche dem Verdichter entnommen wird. Der Einsatz von Kuhlluft vermindert also zwangslaufig den thermischen Wirkungsgrad der Gasturbine. Um die benotigten Kuhlluftmengen moglichst klein zu halten, ist eine genaue Kenntnis der Warmestrome und thermischen Randbedingungen der Gasturbinenschaufeln notwendig. Zahlreiche experimentelle und numerische Untersuchungen befassen sich deswegen mit den verschiedenen Einflussen wie z.B. Freistromturbulenz, Reynoldszahl, Oberflachenrauigkeit auf den Warmeubergang und die Kuhlung von Gasturbinenschaufeln. Dadurch ist im Laufe der Zeit eine umfangreiche Datenbasis entstanden, anhand derer Werkzeuge zur Vorhersage des thermischen und aerodynamischen Verhaltens neuer Gasturbinenschaufeln entwickelt und uberpruft werden konnen. Durch die stetige Weiterentwicklung hin zu einem niedrigeren Leistungsgewicht und hoheren Wirkungsgraden kommen jedoch auch neue Einflussgrossen hinzu, die weitere Untersuchungen notwendig machen. Eine hohere Stufenarbeit zur Reduzierung der benotigten Turbinenstufen und damit eine hohere Stromungsumlenkung fuhren zum verstarkten Auftreten von Gebieten abgeloster Stromung in der Turbine. Durch die ausserst schlanken Profile in der Niederdruckturbine treten dabei nicht nur auf der Saugseite sondern auch auf der Druckseite Ablosegebiete auf. Im Gegensatz zu saugseitigen Ablosegebieten sind druckseitigen Ablosegebiete und ihre Auswirkungen auf den lokalen Warmeubergang sind bisher kaum untersucht. Gleichzeitig zeigen Vergleiche zwischen den wenigen vorhandenen experimentellen Daten und numerischen Vorhersagen grosse Abweichungen sowohl fur den Warmeubergang als auch fur die Aerodynamik. Um diese Lucke zu schliessen, wurde in der vorliegenden Arbeit deshalb eine umfassende experimentelle Untersuchung der Stromung um ein Niederdruckturbinenprofil mit druckseitiger Ablosung durchgefuhrt. Von besonderem Interesse waren dabei die Auswirkungen der turbinentypischen Einflussgrossen Reynoldszahl, Turbulenzgrad sowie von instationaren Nachlaufen auf die Ablosegebiete des untersuchten Niederdruckturbinenprofils. Um die gewonnenen aerodynamischen und Warmeubergangsdaten zur Entwicklung und Validierung von numerischen Werkzeugen zur Stromungsberechnung verwenden zu konnen, kam der genauen Erfassung und Dokumentation der experimentellen Randbedingungen eine entscheidende Rolle zu.


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Product Details
  • ISBN-13: 9783832534660
  • Publisher: Logos Verlag Berlin
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Spine Width: 0 mm
  • Width: 169 mm
  • ISBN-10: 3832534660
  • Publisher Date: 10 Aug 2013
  • Height: 240 mm
  • No of Pages: 146
  • Series Title: Forschungsberichte Aus Dem Institut Fur Thermische Stromungs
  • Weight: 700 gr


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