A frequency-domain numerical method for noise radiation from ducted fans


ÖZYÖRÜK Y. , Alpman E., Ahuja V., Long L.

8th AIAA/CEAS Aeroacoustics Conference and Exhibit, 2002, Breckenridge, CO, United States Of America, 17 - 19 June 2002 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.2514/6.2002-2587
  • City: Breckenridge, CO
  • Country: United States Of America

Abstract

This paper describes a frequency domain numerical method for predicting noise radiation from ducted fans, including acoustic treatment and nonuniform background flow effects. The method solves the Euler equations linearized about a mean flow in the frequency domain. A pseudo-time derivative term is added to the frequency domain equations so that a time marching technique can be employed to drive the acoustic field to steady state explicitly. This approach makes distributed parallel computing more viable for equations of this type and allows use of well known convergence acceleration techniques, such as multigrid, to obtain the solutions efficiently. Simulations of the JT15D and a generic engine are shown at various operating conditions with comparison to results from time domain studies and available experimental data. © 2002 by Y. Özyörük. Published by the American Institute of Aeronautics and Astronautics, Inc.