NDLI: Jet surface interaction-scrubbing noise

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Jet surface interaction-scrubbing noise

Content Provider	NASA Technical Reports Server (NTRS)
Author	Khavaran Sr., Abbas
Copyright Year	2013
Description	Generation of sound due to scrubbing of a jet flow past a nearby solid surface is investigated within the framework of the generalized acoustic analogy theory. The analysis applies to the boundary layer noise generated at and near a wall, and excludes the scattered noise component that is produced at the leading or the trailing edge. While compressibility effects are relatively unimportant at very low Mach numbers, frictional heat generation and thermal gradient normal to the surface could play important roles in generation and propagation of sound in high speed jets of practical interest. A general expression is given for the spectral density of the far-field sound as governed by the variable density Pridmore- Brown equation. The propagation Green's function should be solved numerically starting with the boundary conditions on the surface and subject to specified mean velocity and temperature profiles between the surface and the observer. The equivalent sources of aerodynamic sound are associated with non-linear momentum flux and enthalpy flux terms that appear in the linearized Navier-Stokes equations. These multi-pole sources should be modeled and evaluated with input from a Reynolds-Averaged Navier-Stokes (RANS) solver with an appropriate turbulence model.
File Size	3769405
Page Count	38
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20140002891
Archival Resource Key	ark:/13960/t4fn65m0w
Language	English
Publisher Date	2013-09-01
Access Restriction	Open
Subject Keyword	Acoustics Jet Flow Jet Aircraft Noise Acoustic Velocity Aerodynamic Noise Velocity Distribution Temperature Profiles Noise Generators Turbulence Models Trailing Edges Far Fields Aeroacoustics Leading Edges Boundary Layers 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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