Exploratory Experiments for Simple Approximation of Blade Flutter Aerodynamic Loading Function

0564780 - ÚT 2024 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Lepičovský, Jan - Šimurda, David - Šidlof, P. - Luxa, Martin
Exploratory Experiments for Simple Approximation of Blade Flutter Aerodynamic Loading Function.
Proceedings of the ASME Turbo Expo. Vol. 8-A. New York: American Society of Mechanical Engineers, 2022, č. článku V08AT21A023. ISBN 978-079188606-9.
[ASME Turbo Expo 2022 : Turbomachinery Technical Conference and Exposition : GT2022. Rotterdam (NL), 13.06.2022-17.06.2022]
Grant CEP: GA MŠMT(CZ) LTAUSA19036
Institucionální podpora: RVO:61388998
Klíčová slova: blade flutter * flat cascade * instrumentation
Obor OECD: Applied mechanics
https://asmedigitalcollection.asme.org/GT/proceedings-abstract/GT2022/86069/V08AT21A023/1149086

Exploratory experiments to verify a newly proposed simple method determining an approximate form of unsteady blade loading function are described in this paper In this newly proposed approach, a time-dependent blade loading will be substituted for by a series of static loadings acquired for a range of blade incidence angle offsets. The sequence of static loadings will be converted into a time-dependent quasi-dynamic function computationally. In the course of this project a new test facility for forced blade flutter research capable of transonic inlet flow at high oscillation blade frequencies was designed and built at the IT CAS laboratory. A series of test runs simulating blade flutter conditions were carried out for the inlet Mach number range from 0.6 up to 1.09 and blade oscillation frequencies up to 80 Hz. A blade static loading function was created as a pressure difference measured while the blade was not moving and it was set to the outermost incidence angle offsets of plus/minus 1 deg. A blade dynamic loading function was determined as a peak-to-peak amplitude of measured pressure fluctuation while the blade was oscillated at a frequency of 80 Hz. A very good agreement between the measured blade static and blade dynamic loading functions indicates the potentials of the proposed quasi-dynamic method to closely estimate blade loading functions, at least for the reported range of cascade operation conditions.
Trvalý link: https://hdl.handle.net/11104/0350823