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Physical processes influencing acoustic radiation from jet engine inlets

Published online by Cambridge University Press:  14 May 2013

Christopher K. W. Tam ,
Sarah A. Parrish ,
Edmane Envia  and
Eugene W. Chien
Christopher K. W. Tam*
Affiliation:
Department of Mathematics, Florida State University, Tallahassee, FL 32306-4510, USA
Sarah A. Parrish
Affiliation:
Department of Mathematics, Florida State University, Tallahassee, FL 32306-4510, USA
Edmane Envia
Affiliation:
NASA Glenn Research Center, Cleveland, OH 44135, USA
Eugene W. Chien
Affiliation:
Goodrich Aerostructures Group, Chula Vista, CA 91910, USA
*
†Email address for correspondence: tam@math.fsu.edu
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Abstract

Numerical simulations of acoustic radiation from a jet engine inlet are performed using advanced computational aeroacoustics algorithms and high-quality numerical boundary treatments. As a model of modern commercial jet engine inlets, the inlet geometry of the NASA Source Diagnostic Test is used. Fan noise consists of tones and broadband sound. This investigation considers the radiation of tones associated with upstream-propagating duct modes. The primary objective is to identify the dominant physical processes that determine the directivity of the radiated sound. Two such processes have been identified. They are acoustic diffraction and refraction. Diffraction is the natural tendency for an acoustic duct mode to follow a curved solid surface as it propagates. Refraction is the turning of the direction of propagation of a duct mode by mean flow gradients. Parametric studies on the changes in the directivity of radiated sound due to variations in forward flight Mach number, duct mode frequency, azimuthal mode number and radial mode number are carried out. It is found there is a significant difference in directivity for the radiation of the same duct mode from an engine inlet when operating in static condition versus one in forward flight. It will be shown that the large change in directivity is the result of the combined effects of diffraction and refraction.

JFM classification

Acoustics: Acoustics Acoustics: Aeroacoustics
Type
Papers
Information
Journal of Fluid Mechanics , Volume 725 , 25 June 2013 , pp. 152 - 194
Copyright
©2013 Cambridge University Press 

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