UHBR Open-Test-Case Fan ECL5/CATANA

The application of composite fans enables disruptive design possibilities but increases sensitivity to multi-physical resonance between aerodynamic, structure dynamic and acoustic phenomena. As a result, aeroelastic problems increasingly set the stability limit. Test cases representative geometries without industrial restrictions are key element an open scientific culture currently non-existent in turbomachinery community. In order provide validation benchmark near-future UHBR fan concepts, open-test-case stage ECL5 was developed at Ecole Centrale de Lyon. intention develop geometry with high efficiency wide range that can be realized using carbon fibre composites. This publication aims introduce final test case, which is fabricated will experimentally tested. blades composed laminate made unidirectional fibres epoxy plies. Their structural properties ply orientations presented. To characterize details given on aerodynamic whole stage, dynamics fan. These obtained state-of-art process: static modal FEM, RANS LRANS simulations. Aerodynamic analysis focuses performance shows critical flow structures such as tip leakage flow, radial migration separations. Mechanical modes described discussed context interactions. frequency distribution validated terms risk respect synchronous vibration. evaluated operating points systematic approach. Potential instabilities observed far from line do not compromise experimental campaigns.