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Spectral-element/Kirchhoff method for fan-tone directivity calculations

Version 2 2024-06-06, 11:14
Version 1 2017-07-26, 14:56
conference contribution
posted on 2024-06-06, 11:14 authored by DA Venditti, D Ait-Ali-Yahia, M Robichaud, G Girard
A Kirchhoff integral method is coupled to a spectral-element radiation solver for efficient computations of fan-tone directivities at arbitrary distances from a turbofan inlet The Kirchhoff algorithm accurately constructs the acoustic solution at specified locations in the farfield by processing near-field data supplied by the spectral-element solver. This allows the use of a much smaller spectral-element domain concentrated near the engine that is not required to encompass the specified directivity radius. The use of a smaller computational domain translates into a reduction in overall CPU time and/or an increase in the frequency limit of the code. This paper presents a detailed description of the theory, implementation, and validation of the Kirchhoff algorithm. Numerical studies are performed to address the following issues: 1) optimal placement of the Kirchhoff integration surface in the presence of a locally non-uniform mean-flow; 2) impact of a partially opened Kirchhoff surface on the accuracy of the predicted directivity. The spectral-element/Kirchhoff system is further demonstrated by computing inlet radiation directivities up to a radius of 150 feet for practical engine power conditions and frequencies. Copyright © 2005 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

History

Volume

3

Pagination

1582-1592

Location

Monterey, California

Start date

2005-05-23

End date

2005-05-25

ISBN-10

1563477300

Publication classification

EN.1 Other conference paper

Title of proceedings

Collection of Technical Papers - 11th AIAA/CEAS Aeroacoustics Conference

Publisher

American Institute of Aeronautics and Astronautics

Place of publication

Reston, Va.

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