Master thesis and internship[BR]- Master's thesis : Simulations of casing treatment on low pressure compressor[BR]- Integration Internship : Safran Aero Boosters

Abstract

This thesis presents unsteady casing treatment simulations on a Stator-Rotor domain of a high-speed booster. All geometrical parameters and inlet conditions are taken from a reference case. The aim was threefold. The first was to acquire the calculation method developed by Safran Tech and make it work at Safran Aero Boosters. The second was to compare the results obtained by simulation with the experimental reference case tests carried out in 2018. The last, which is more academic, was to understand how this type of technology works through numerous analyses such as performance map, radial profiles, probes and ParaView visualization. Several comparisons are made. The first evaluates the difference between simulations with and without casing treatment. The impact of carter treatment is clearly visible, and a margin gain is observed. The second compares the results of simulations with differ ent turbulence models (K-L Smith and Spalart-Allmaras). The Spalart-Allmaras model is deficient in predicting the near stall. The last compares the difference in behaviour between two different casing treatment geometries, with and without plenum.One is a recirculating mode. The other is a pulsating mode. The results show that this technology is very promising. In view of the growing economic and environmental challenges facing the aerospace industry, there’s no doubt that the casing treatment will make its appearance on aircraft engines sooner or later.