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Preliminary study of the effect of the turbulent flow field around complex surfaces on their acoustic characteristicsFundamental theories for noise generated by flow over surfaces exist for only a few simple configurations. The role of turbulence in noise generation by complex surfaces should be essentially the same as for simple configurations. Examination of simple-surface theories indicates that the spatial distributions of the mean velocity and turbulence properties are sufficient to define the noise emission. Measurements of these flow properties were made for a number of simple and complex surfaces. The configurations were selected because of their acoustic characteristics are quite different. The spatial distribution of the turbulent flow properties around the complex surfaces and approximate theory are used to locate and describe the noise sources, and to qualitatively explain the varied acoustic characteristics.
Document ID
19780020943
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Olsen, W. A. (NASA Lewis Research Center Cleveland, OH, United States)
Boldman, D. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1978
Subject Category
Acoustics
Report/Patent Number
E-9691
NASA-TM-78944
AIAA PAPER 78-1123
Meeting Information
Meeting: Fluid and Plasma Dyn. Conf.
Location: Seattle
Start Date: July 10, 1978
End Date: July 12, 1978
Sponsors: AIAA
Accession Number
78N28886
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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