Benoît Paoletti
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View article: ECL5/CATANA: Comparative Analysis of Advanced Blade Vibration Measurement Techniques
ECL5/CATANA: Comparative Analysis of Advanced Blade Vibration Measurement Techniques Open
A comprehensive understanding of aerodynamic instabilities, such as flutter, non-synchronous vibration (NSV), rotating stall, and forced response, is crucial for the safe and efficient operation of turbomachinery, particularly fans and com…
View article: ECL5/CATANA: Transition from Non-Synchronous Vibration to Rotating Stall at Transonic Speed
ECL5/CATANA: Transition from Non-Synchronous Vibration to Rotating Stall at Transonic Speed Open
Non-synchronous vibration (NSV), flutter, or rotating stall can cause severe blade vibrations and limit the operating range of compressors and fans. To enhance the understanding of these phenomena, this study investigated the corresponding…
View article: Experiments on Structurally Mistuned UHBR Open-Test-Case Fan ECL5/CATANA
Experiments on Structurally Mistuned UHBR Open-Test-Case Fan ECL5/CATANA Open
The operational capabilities of turbofan engines encounter limitations due to instabilities arising from tightly coupled interactions among aerodynamics, acoustics, and structural mechanics. Modern fans and compressors exhibit non-synchron…
View article: Quantification of Blade Vibration Amplitude in Turbomachinery
Quantification of Blade Vibration Amplitude in Turbomachinery Open
Experimental monitoring of blade vibration in turbomachinery is typically based on blade-mounted strain gauges. Their signals are used to derive vibration amplitudes which are compared to modal scope limits, including a safety factor. Acco…
View article: Experiments on Tuned UHBR Open-Test-Case Fan ECL5/CATANA: Performance and Aerodynamics
Experiments on Tuned UHBR Open-Test-Case Fan ECL5/CATANA: Performance and Aerodynamics Open
With the advancement of modern fan architectures, the lack of experimental benchmarks for the research community became apparent in the recent years. Enormous effort in the method development could not be validated on representative geomet…
View article: Experiments on Tuned UHBR Open-Test-Case Fan ECL5/CATANA: Stability Limit
Experiments on Tuned UHBR Open-Test-Case Fan ECL5/CATANA: Stability Limit Open
Research of the past decades has shown that the operating range of modern fans and compressors is often limited by aeroelastic phenomena before the onset of pure aerodynamic instability. Prediction of these mechanisms is challenging for st…
View article: Experimental monitoring of vibrations and the problem of amplitude quantification
Experimental monitoring of vibrations and the problem of amplitude quantification Open
Experimental monitoring of blade vibration in turbomachinery is typically based on blade-mounted strain gauges. Their signals are used to derive vibration amplitudes which are compared to previously determined modal scope limits, including…
View article: Interpretation of Stall Precursor Signatures
Interpretation of Stall Precursor Signatures Open
Unsteady aerodynamic phenomena appearing close to the stall boundary in axial fans and compressors have been the subject of extensive investigations. A particular phenomenon known as “rotating instabilities” typically occurs in the tip reg…
View article: Aerodynamic Investigation of a Composite Low-Speed Fan for UHBR Application
Aerodynamic Investigation of a Composite Low-Speed Fan for UHBR Application Open
A composite fan stage representative of a modern Ultra High Bypass Ratio (UHBR) architecture has been investigated experimentally on a novel test facility at Ecole Centrale de Lyon. These measurements show indications for strong overloadin…
View article: Compressible Modal Instability Onset in an Aerodynamically Mistuned Transonic Fan
Compressible Modal Instability Onset in an Aerodynamically Mistuned Transonic Fan Open
This paper describes observed modal oscillations arising from a feedback mechanism between an acoustic resonance in the exit flow channel and aerodynamic and aeroelastic disturbances in a transonic fan stage. During tests, the fan suffered…
View article: Observations on Rotating Instabilities and Spike Type Stall Inception in a High-Speed Multistage Compressor
Observations on Rotating Instabilities and Spike Type Stall Inception in a High-Speed Multistage Compressor Open
This work investigates high-frequency measurements for the contribution to the understanding of different stall inception types in high-speed multistage compressors. A 3.5-stage high-speed axial multistage compressor is investigated with a…