1. HPT 3-D Nozzle project Project supervisor T.H. Fransson Students O. Bron, A. Kessar Background: Large influence of unsteady flow effects in turbomachinery flow Strong interactions between Steady and Unsteady Flows oinfluence on shock motion oinfluence separation oinfluence on far acoustic field Engine Compressor Stage Interblade Passage 1\3 Objectives: Establish a better understanding of fundamental steady/unsteady flow interactions by analysing: –Unsteady shock motion –Separated zone motion –Importance of the “acoustic blockage” in 2D transonic flow –Non-linear shock/boundary layer interaction in unsteady flows at different operating conditions

2. HPT 3-D Nozzle project: Experimental part e Facility: Test objects (2-D\3-D bumps), simulating interblade passage. Unsteadiness introduced by back pressure fluctuations generator. Schlieren visualisation Picture of the Test section 2\3 Measurement Techniques: Oil & conventional Schlieren visualisations, Hotfilm/Hotwire measurements, surface pressure maping (both steady-state and high frequency), LDA & 3D-L2F velocity measurements, PIV...

3. HPT 3-D Nozzle project: Numerical part Simulations: 2D/3D steady/unsteady RANS with k-  turbulent model Simulations of both 2-D/3-D test objects Interaction phenomena modelisation 3\3 Exp-Num Comparison: Qualitative & quantitative comparison Validation of physical/numerical models Database elaboration 50% channel