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RESEARCH PAPERS: Numerical Methods in Acoustics

Finite Element-Integral Acoustic Simulation of JT15D Turbofan Engine

[+] Author and Article Information
K. J. Baumeister

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135

S. J. Horowitz

U.S. Air Force

J. Vib., Acoust., Stress, and Reliab 106(3), 405-413 (Jul 01, 1984) (9 pages) doi:10.1115/1.3269210 History: Received December 12, 1983; Online November 23, 2009

Abstract

An iterative finite element-integral technique is used to predict the sound field radiated from the JT15D turbofan inlet. The sound field is divided into two regions: the sound field within and near the inlet which is computed using the finite element method, and the radiation field beyond the inlet which is calculated using an integral solution technique. The velocity potential formulation of the acoustic wave equation was employed in the program. For some single mode JT15D data, the theory and experiment are in good agreement for the far field radiation pattern as well as suppressor attenuation. Also, the computer program is used to simulate flight effects that cannot be performed on a ground static test stand.

Copyright © 1984 by ASME
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