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International Journal of Turbomachinery, Propulsion and Power, Volume 10, Issue 3
September 2025 - 18 articles
Cover Story: Non-Synchronous Vibration (NSV), flutter or rotating stall can cause severe blade vibration and limit compressor and fan operation. To improve understanding, this paper examines underlying mechanisms in modern UHBR fans based on the ECL5/CATANA test campaign. Using extensive instrumentation such as Stereo-PIV, fast-response pressure probes and rotor strain gauges aerodynamic and structural characteristics are derived. The focus is on the transition from transonic to subsonic speeds where two distinct phenomena, rotating stall and NSV, are observed. The results emphasize that both occur in a narrow range of operation (even simultaneously at specific conditions) with different wave characteristics. The findings enhance knowledge of instabilities in UHBR fans and support numerical validation. View this paper
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Int. J. Turbomach. Propuls. Power - ISSN 2504-186X