NDLI: Interaction of aerodynamic noise with laminar boundary layers in supersonic wind tunnels

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Interaction of aerodynamic noise with laminar boundary layers in supersonic wind tunnels

Content Provider	NASA Technical Reports Server (NTRS)
Author	Schopper, M. R.
Copyright Year	1984
Description	The interaction between incoming aerodynamic noise and the supersonic laminar boundary layer is studied. The noise field is modeled as a Mach wave radiation field consisting of discrete waves emanating from coherent turbulent entities moving downstream within the supersonic turbulent boundary layer. The individual disturbances are likened to miniature sonic booms and the laminar boundary layer is staffed by the waves as the sources move downstream. The mean, autocorrelation, and power spectral density of the field are expressed in terms of the wave shapes and their average arrival rates. Some consideration is given to the possible appreciable thickness of the weak shock fronts. The emphasis in the interaction analysis is on the behavior of the shocklets in the noise field. The shocklets are shown to be focused by the laminar boundary layer in its outer region. Borrowing wave propagation terminology, this region is termed the caustic region. Using scaling laws from sonic boom work, focus factors at the caustic are estimated to vary from 2 to 6 for incoming shocklet strengths of 1 to .01 percent of the free stream pressure level. The situation regarding experimental evidence of the caustic region is reviewed.
File Size	9805112
Page Count	170
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19840012713
Archival Resource Key	ark:/13960/t2s51h78s
Language	English
Publisher Date	1984-04-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Heat Transfer Shock Waves Wave Propagation Laminar Boundary Layer Fluid Dynamics Power Spectra Scaling Laws Wind Tunnel Tests Turbulent Boundary Layer Aerodynamic Noise Flow Velocity Boundary Layer Transition 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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