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M. Amer, N. Maroldt, J. Seume
Multistage effects in turbomachines can lead to multiresonance phenomena where multiple eigenfrequencies are excited at the same time. In turn, these multiresonance phenomena can result in high amplitude blade vibrations and other as yet uninvestigated phenomena. This results in a shorter fatigue life, and therefore their investigation is of great importance in the prevention of structural failure. Multistage effects result from the reciprocal influence of multiple stages on each other. Multiresonance, a simultaneous excitation of at least two modes, can arise due to different blade numbers in the stages which then lead to an excitation of multiple modes through different engine orders, resulting from the interaction of the number of blades and vanes, simultaneously. To study multistage effects on the vibrational behavior of compressor blisks, a simplified setup is chosen where a single stage blisk is excited by adjustable inlet guide vanes. The multiple stages are represented by changing the angle of attack of each individual vane. This allows the multistage effect to be imitated using adjustable inlet guide vanes. The effect on the blade vibration is measured with a tip timing system. Two major objectives are pursued: firstly, the excitation of two different engine orders, ideally simultaneously, and secondly, the investigation of multistage effects which lead to multiresonance.
Deutscher Luft- und Raumfahrtkongress 2019, Darmstadt
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2020
21,0 x 29,7 cm, 10 Seiten
Stichworte zum Inhalt:
blisk, compressor, multiharmonic excitation, multistage, engine order, tip timing
Amer, M.; Maroldt, N.; Seume, J. (2020): Investigation of Multiharmonic Effects in a Single Stage High Speed Compressor. Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.. (Text). https://doi.org/10.25967/490212. urn:nbn:de:101:1-2020081910031319244079.