The nature of supersonic flutter, to which high tip speed, front stage fans of modern aircraft turbofan engines are susceptible, is introduced briefly. The effect of varying engine intake conditions of altitude, flight speed and ambient temperature are examined and test data is compared with theory. Some important flight conditions for minimum flutter margins in typical civil and military applications are outlined. The effect of engine intake type is then covered with respect to the degree of pressure distortion presented to the fan. A tentative relationship is derived between this distortion and flutter onset speed. (Peters)
The effect of intake conditions on supersonic flutter in turbofan engines
Die Auswirkung der Bedingungen am Einlass auf die Ueberschallschwankungen in Blaesertriebwerken
1979
8 Seiten, 10 Bilder, 5 Quellen
Conference paper
English