Finite element models for predicting the propagation and radiation of fan noise from turbofan engines

Astley, Jeremy, Sugimoto, Rie, Gabard, Gwenael, Tsuchiya, Naoki and Tsutomu, Ooishi (2006) Finite element models for predicting the propagation and radiation of fan noise from turbofan engines. In Proceedings of Inter-Noise 2006. International Institute of Noise Control Engineering..

Abstract

Finite Element methods are presented for predicting fan noise radiation from turbofan aero-engines. Fan noise is a major contributors to whole aircraft noise for current High-Bypass-Ratio (HBR) aero-engines. The work reported here seeks to develop robust prediction methods for forward and aft-radiated noise which can be used to study and optimize the acoustic design of engine ducts. The current article focusses on propagation through the by-pass duct. Two hybrid methods are described in which in-duct propagation is predicted by using two different Finite Element approaches. Both are designed to model the effects of non-axisymmetric liners within such ducts. In both cases, radiation is dealt with by matching an in-duct finite element solution at the exhaust plane to an analytic radiation model which takes into account refraction through the shear layer and reflection from a acoustically hard centrebody. Results will be presented to illustrate the capabilities of such models and a simple benchmark problem is presented in which the predictions obtained from each methods are compared for acoustic scattering by hard rectangular patch in a lined annular duct.

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Contributors

Author: Rie Sugimoto

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