Aerodynamic studies of the flutter behavior of a compressor jet engine : Establishment of 1D criteria for the appearance of flutter within low pressure compressors

Abstract: Turbojet compressors are subject to numerous vibration phenomena that limit their good operability. Among these different phenomena, flutter is a major concern during the study and design phase. This aeroelastic instability can have an impact on the correct operation of the compressor. The precise reasons for the appearance of this phenomenon remain relatively unknown today.  This thesis aims to study the flutter phenomenon in turbojet compressors. The objective set for this internship is to reproduce the stationary aerodynamic configurations observed during turbomachinery compressor tests using 2D and 3D computer calculation tools. A first phase of bibliographic research was done to know more on the theory of flutter in compressors as well as to highlight the already existing works on the subject. Then, computer modeling was carried out on a compressor testing that showed flutter. Thanks to these simulations, different criteria were defined from the calculations and the analysis of results.  The final objective of this internship is therefore to know more precisely the various factors of appearance of the self-induced flutter within the compressors, in order to introduce and/or improve criteria to avoid this phenomenon in the future when designing new compressors.