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An experimental evaluation of the application of the Kirchhoff formulation for sound radiation from an oscillating airfoilThe Kirchhoff integral formulation is evaluated for its effectiveness in quantitatively predicting the sound radiated from an oscillating airfoil whose chord length is comparable with the acoustic wavelength. A rigid airfoil section was oscillated at samll amplitude in a medium at rest to produce the sound field. Simultaneous amplitude and phase measurements were made of surface pressure and surface velocity distributions and the acoustic free field. Measured surface pressure and motion are used in applying the theory, and airfoil thickness and contour are taken into account. The result was that the theory overpredicted the sound pressure level by 2 to 5, depending on direction. Differences are also noted in the sound field phase behavior.
Document ID
19780004858
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Brooks, T. F. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
December 1, 1977
Subject Category
Acoustics
Report/Patent Number
L-11479
NASA-TP-1048
Accession Number
78N12801
Funding Number(s)
PROJECT: RTOP 505-03-11-04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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