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The University of Southampton
Engineering

Prediction

Computer models have been developed aimed at the prediction of the broadband noise from turbofan engines, airfoils, open rotors and contra-rotating fans.

Turbofan engines

Computer models for the prediction of the broadband noise due to rotor - stator interaction have been developed. The model was developed further and verified against the experimental results obtained on a low speed fan rig at DLR in Berlin.

Rotor wake characterisation

Broadband noise models require a full characterisation of the turbulence velocity w two-point correlation. A new method for quantifying this function, based on cyclo-stationary analysis, has been developed. It is based on the assumption that the statistical properties of the wakes are identical and therefore periodic. An example of the application of this method for characterising the rotor wake turbulence in the low speed fan rig at DLR is presented here.

Open rotors 

Models have been developed for the prediction of the broadband noise from a single open propeller. The noise mechanism is assumed to be due to turbulent boundary layer interaction with the trailing edge.

Contra-rotating fans

Work is currently underway in the 6th Framework Project, DREAM, to predict the broadband noise due to Contra Rotating Fans (CRP's). A preliminary comparison of the measured and predicted noise spectrum of the broadband noise due to a 7-bladed CRP (photo, left) is shown below. The results from two models are shown; the prediction obtained using the simple method due to Mani and a method currently being developed. 

Low speed fan rig at DLR, Berlin.
Photograph of the R212 propeller.
Rig140: 7 × 7 bladed 1/5 model open rotor in ARA transonic wind tunnel (1989).
7 × 7 bladed 1/5 model open rotor
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