Session: 28-06 Structure Characterization and Identification

Paper Number: 127539

127539 - Experiment on Tuned Open-Test-Case Fan ECL5/CATANA: Structural Characterization Under Vacuum Conditions 

The CATANA project aims to promote the development of the next generation of Ultra-High-Bypass-Ratio Turbofan engines by closing the knowledge gaps concerning multi-physical interactions which affect performance and limit the stability range. The composite-material fan stage ECL5, designed at Ecole Centrale de Lyon, will provide a benchmark configuration for the community.

The open composite-material fan stage ECL5 representative of near future UHBR architecture is tested under vacuum conditions in order to characterize its structural behaviour, mainly the structural damping of the whole fan blade assembly.

This fan has been extensively tested at the aerodynamic PHARE-#2 (rotating machinery platform for environmental risk control #2) test facility in different running conditions at the laboratory of Fluid Mechanic and Acoustic at the Ecole Centrale de Lyon for synchronous and asynchronous responses (NSV).

The fan will be analysed on the speed vacuum facility PHARE-#1 in order to identified structural modal parameters. The individual blades will be equipped with piezo actuators to excite structural modes. Via embedded strain gauges, the response of the blades could be measured.

The instrumented fan blades are firstly tested individually by means of a test hub. Efficiency of the piezoelectric actuators is demonstrated for reaching representatives amplitudes. Also, the dispersion of the frequencies of individual blades is quantified and it shows in particular that the added exciters has negligible influence on the dynamics and specially on the mistuning.

The response of the fan is measured using the same instrumentation as for aerodynamic experiments and rotated at the same speed. The influence of the rotating speed and of the vibration level on modal damping is shown and quantified.

Presenting Author: Kevin Billon Univ. Lyon, Ecole Centrale De Lyon, LTDS UMR 5513

Presenting Author Biography: PhD at FEMTO-ST "Periodic composites for vibroacoustic wideban absoption from 2013 to 2016
Project Engineer at INSA de Lyon from 2017 to 2019
Research Engineer at LDTS, Ecole centrale de Lyon from 2019 to now (Numerical and experimental studies on the Equipex Phare#1)

Authors:

Kevin Billon Univ. Lyon, Ecole Centrale De Lyon, LTDS UMR 5513
Lionel Sanchez Univ. Lyon, Ecole Centrale De Lyon, LTDS UMR 5513
Gaëtan Bouvard Univ. Lyon, Ecole Centrale De Lyon, LTDS UMR 5513
Claude Gibert Univ. Lyon, Ecole Centrale De Lyon, LTDS UMR 5513
Laurent Blanc Univ. Lyon, Ecole Centrale De Lyon, LTDS UMR 5513
Fabrice Thouverez Univ. Lyon, Ecole Centrale De Lyon, LTDS UMR 5513