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Sources of sound in fluid flowsSome features of a flow that produce acoustic radiation, particularly when the flow is turbulent and interacting with solid surfaces such as turbine or compressor blades are discussed. Early theoretical ideas on the subject are reviewed and are shown to be inadequate at high Mach number. Some recent theoretical developments that form the basis of a description of sound generation by supersonic flows interacting with surfaces are described. At high frequencies the problem is treated as one of describing the surface-induced diffraction field of adjacent aerodynamic quadrupole sources. This approach has given rise to distinctly new features of the problem that seem to have bearing on the radiating properties of relatively large aerodynamic surfaces.
Document ID
19750003120
Document Type
Conference Paper
Authors
Williams, J. E. F. (Imperial Coll. of Science and Technology London, United Kingdom)
Date Acquired
August 8, 2013
Publication Date
January 1, 1974
Publication Information
Publication: Pennsylvania State Univ. Fluid Mech., Acoustics, and Design of Turbomachinery, Pt. 2
Subject Category
FLUID MECHANICS AND HEAT TRANSFER
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19750003119Analytic PrimaryFluid mechanics, acoustics, and design of turbomachinery, part 2