1 EXPERIMENTAL AND NUMERICAL INVESTIGATION OF UNSTEADY FLOWS IN A HIGH SPEED THREE STAGES COMPRESSOR

This study takes place in the frame of a research project to better understand the flow that develops in a multistage high pressure compressor. The present paper focuses on the unsteady effects induced by rotor-stator interactions. Two complementary approaches are considered to increase data reliability and investigation capacity. First the flow is computed by the mean of a numerical approach, considering a 3D unsteady RANS flow solver. Then experimental data are used to validate and enhance the database. Results show that a good estimation of the mean flow features is obtained with the numerical model, even if some discrepancies are also observed, especially when regarding the transport of information along the axial distance. Detailed investigations of the flow at design and off-design conditions are then presented with the objective to underline the role of rotor-stator interactions