Global Power and Propulsion (GPPS): Montreal18 - Proceedings
Published May 7, 2018 | Version v1
Conference paper Open

Large Eddy Simulation of a Rotor Stage for Fan Noise Source Diagnostic

Creators

  • 1. Université de Sherbrooke Canada
  • 2. CERFACS France

Description

A Large Eddy Simulation (LES) of the NASA Source Diagnostic Test turbofan is performed focusing on a single rotor blade without the stator vanes to put emphasis on the grid resolution in both the tip clearance and the rotor wake without any potential effect from the stator. The investigated operating condition is representative of approach conditions for which the rotor is operating out-of-design. Good agreement with aerodynamic measurements is observed at two different axial positions for the mean and wake turbulence values. In the LES, the boundary layer naturally transitions to turbulence on the blade suction side but remains quasi laminar over most of its pressure side. Flow visualizations capture the tip leakage flow and the complex influence of resolved coherent structures in the boundary layer and wake development. Last, the Power Spectral Density is analyzed in the wake and on the blades for the axial velocity and pressure fluctuations respectively.

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Additional details

References

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