Broadband noise prediction from wake-rotor interaction in contra-rotating propfans

Blandeau, Vincent P., Joseph, Phillip J. and Tester, Brian J. (2009) Broadband noise prediction from wake-rotor interaction in contra-rotating propfans. In Proceedings of the 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference). American Institute of Aeronautics and Astronautics..

Abstract

A semi-analytical model for the prediction of the broadband noise due to the interaction
between turbulent rotor wakes and a rotor in contra-rotating propfans (CRPs) is presented.
The unsteady loading of the rear rotor is modelled using classical isolated flat-plate theory.
Strip theory is used to treat the spanwise variations of aerodynamic quantities and blade
geometry. The turbulent wake is assumed to be homogeneous and isotropic that is modulated
by a wake train of wake profiles and is modelled using an analytical 3D turbulent
velocity spectrum (Von Karman’s model). The model is presented in detail and insight into
its modal behaviour is provided. Predictions and measurements differ by no better than
14dB. This may indicate the presence of other broadband noise sources or measurement
error due to the facility

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