NDLI: Some factors influencing radiation of sound from flow interaction with edges of finite surfaces

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Some factors influencing radiation of sound from flow interaction with edges of finite surfaces

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hayden, R. E. Chanaud, R. C. Fox, H. L.
Copyright Year	1976
Description	Edges of surfaces which are exposed to unsteady flow cause both strictly acoustic effects and hydrodynamic effects, in the form of generation of new hydrodynamic sources in the immediate vicinity of the edge. An analytical model is presented which develops the explicit sound-generation role of the velocity and Mach number of the eddy convection past the edge, and the importance of relative scale lengths of the turbulence, as well as the relative intensity of pressure fluctuations. The Mach number (velocity) effects show that the important paramater is the convection Mach number of the eddies. The effects of turbulence scale lengths, isotropy, and spatial density (separation) are shown to be important in determining the level and spectrum of edge sound radiated for the edge dipole mechanism. Experimental data is presented which provides support for the dipole edge noise model in terms of Mach number (velocity) scaling, parametric dependence on flow field parameter, directivity, and edge diffraction effects.
File Size	4534257
Page Count	107
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19770016955
Archival Resource Key	ark:/13960/t6d26qc55
Language	English
Publisher Date	1976-01-01
Access Restriction	Open
Subject Keyword	Acoustics Wave Diffraction Surface Reactions Aircraft Noise Flow Distribution Trailing Edges Aerodynamic Noise Unsteady Flow Noise Generators Turbulent Diffusion Leading Edges Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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