Numerical Simulations of Fan Interaction Noise Using a Hybrid Approach.
- Resource Type
- Article
- Authors
- Polacsek, C.; Burguburu, S.; Redonnet, S.; Terracol, M.
- Source
- AIAA Journal. Jun2006, Vol. 44 Issue 6, p1188. 1p.
- Subject
- *FLUID dynamics
*SIMULATION methods & models
*FLUID mechanics
*SPACE environment
*NOISE generators (Electronics)
*ANALYTICAL mechanics
*WIND tunnels
- Language
- ISSN
- 0001-1452
A source-to-far-field computation procedure aimed at predicting the noise generated by rotor-stator fan interactions is presented here. Interaction noise sources are assessed using a three-dimensional Reynolds-averaged Navier-Stokes (RANS) code. A modal expansion is applied to the computational fluid dynamics (CFD) data, and a source model is used to link the CFD to an Euler code simulating the acoustic propagation. Far-field noise is classically obtained by means of a Kirchhoff integral. The source model is detailed and validated over a selected benchmark. Then the hybrid method is applied to a turbofan model, tested in the German-Dutch Wind Tunnel. Simulations are compared to boundary element method computations previously performed and used here to validate the no-flow solution. Interacting cut-on mode amplitude deduced from CFD output postprocessing is adjusted to fit in-duct measurements on the outer wall. The predicted radiation field is related to the directivity patterns measured at several axial positions upstream of the fan inlet and fairly good agreement is found using the RANS/Euler/Kirchhoff procedure. [ABSTRACT FROM AUTHOR]