Proper Orthogonal Decomposition Method for the Prediction of Fan Broadband Interaction Noise

The turbulent wake generated by a rotor interacting with outlet guide vanes (OGVs) is one of the dominant broadband noise sources in turbofan engine. An accurate representation turbulence therefore important for reliable prediction rotor–OGV interaction noise. This paper presents synthesis method based on spectral proper orthogonal decomposition (POD) that aims to reproduce desired velocity cross-spectrum along OGV leading edges where emitted due turbulence–OGV interaction. first developed frequency domain superposition vortical modes appropriate amplitudes. Fourier and POD are proposed represent two-point spectrum. will be shown highly efficient reconstructing flowfield near tip region large-scale coherent structure present. extension synthetic time also presented means white filtering technique allow generation time-varying signals cross-spectral characteristics. results show both one- statistics can closely reproduced. frequency-domain fan realistic fan–OGV configuration illustrated use linearized Navier–Stokes solver predict sound power radiation each mode. Overall levels at number discrete frequencies predicted compared against measured data. Agreement found within uncertainty measurement.