Implementation of a tool and simplified criteria for the analysis of blade aero-elasticity

Numbers of vibratory phenomena occur on a turbomachinery fan. Among the various challenges to take into account in conception, this report focuses on an aero-elastic instability called flutter that can reduce engine operating range. It’s caused by a lot of factors and so, its origin can be different from case to case (for instance aerodynamic, acoustic origin). It needs to focus on the cause of this phenomenon: from certain prediction criteria, the aim of this report is to present the improvements made on the evaluation of the flutter criticality during design phase. A first bibliographic study has allowed to increase the knowledge of criteria used for verifying the flutter influence on the fan performances and operability. In order to assess quickly the aero-elastic risk of fan blades, a tool has been implemented depending on the state of the art and, firstly, only certain criteria. As a second step, this tool has been used for evaluating other criteria with the aim of considering the influence of different phenomena in this study. It has allowed to make comparisons among a lot of engines.