The Effect of Steady Flow Distortion on Acoustic Mode Propagation in a Straight Annular Duct

Prinn, Albert G., Astley, Richard Jeremy, Sugimoto, Rie and Rarata, Zbigniew (2014) The Effect of Steady Flow Distortion on Acoustic Mode Propagation in a Straight Annular Duct. FFT Acoustic Simulation Conference 2014: Actran Users' Meeting, Diamant Conference & Business Centre, Brussels, Belgium. 15 - 16 Oct 2014. 25 pp .

Record type: Conference or Workshop Item (Other)

Abstract

Steady flow distortion in turbofan intakes results from non-axisymmetric nacelle geometry and non-zero flow incidence. It may have a significant effect on the propagation and attenuation of acoustic modes generated by the fan propagating through a lined intake. In order to study this effect, the propagation of a single incident mode of the azimuthal order m through a circumferentially distorted axial mean flow in a uniform, lined annular duct has been calculated by using an ACTRAN TM model and compared to results obtained by an eigenmode approach to validate both methods.

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Published date: October 2014

Additional Information: Presentation only

Venue - Dates: FFT Acoustic Simulation Conference 2014: Actran Users' Meeting, Diamant Conference & Business Centre, Brussels, Belgium, 2014-10-15 - 2014-10-16

Keywords: Turbofan engine noise, Fan noise, Aircraft noise, computational aeroacoustics (CAA), ACOUSTICS, Aeroacoustics, PREDICTION, ACTRAN