HPT3-D Nozzle project

Project supervisorT.H. Fransson

StudentsO. Bron, A. Kessar

3-D Nozzle project

Project supervisorT.H. Fransson

StudentsO. Bron, A. Kessar

• Background:• Large influence of unsteady flow effects in turbomachinery flow

• Strong interactions between Steady and Unsteady Flows

o influence on shock motion

o influence separation

o influence on far acoustic field

Engine

Compressor Stage

Interblade Passage

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• 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

HPT3-D Nozzle project: Experimental part

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

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Measurement Techniques:• Oil & conventional Schlieren visualisations, Hotfilm/Hotwire measurements, surface pressure maping (both steady-state and high frequency), LDA & 3D-L2F velocity measurements, PIV...

HPT3-D Nozzle project: Numerical part

3-D Nozzle project: Numerical partSimulations:

• 2D/3D steady/unsteady RANS with k- turbulent model

• Simulations of both 2-D/3-D test objects

• Interaction phenomena modelisation

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Exp-Num Comparison:• Qualitative & quantitative comparison

• Validation of physical/numerical models

• Database elaboration50% channel