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Comparison of radiated noise from shrouded and unshrouded propellersThe ducted propeller in a free field is modeled using the finite element method. The generation, propagation, and radiation of sound from a ducted fan is described by the convened wave equation with volumetric body forces. Body forces are used to introduce the blade loading for rotating blades and stationary exit guide vanes. For an axisymmetric nacelle or shroud, the problem is formulated in cylindrical coordinates. For a specified angular harmonic, the angular coordinate is eliminated, resulting in a two-dimensional representation. A finite element discretization based on nine-node quadratic isoparametric elements is used.
Document ID
19930071864
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Eversman, Walter
(Missouri-Rolla Univ. Rolla, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: International Congress on Recent Developments in Air- and Structure-Borne Sound and Vibration, 2nd, Auburn Univ., AL, Mar. 4-6, 1992, Proceedings. Vol. 1 (A93-55851 24-31)
Publisher: Auburn University
Subject Category
Acoustics
Accession Number
93A55861
Distribution Limits
Public
Copyright
Other

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