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On optical imaging through aircraft turbulent boundary layers
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Sutton, G. W. |
| Copyright Year | 1980 |
| Description | Optical resolution quality as affected by aircraft turbulent boundary layers is analyzed. Wind-tunnel data was analyzed to obtained the variation of boundary layer turbulence scale length and mass density rms fluctuations with Mach number. The data gave good agreement with a mass density fluctuation turbulence spectrum that is either isotropic of orthogonally anisotropic. The data did not match an isotropic turbulence velocity spectrum which causes an anisotropic non-orthogonal mass density fluctuation spectrum. The results indicate that the average mass density rms fluctuation is about 10% of the maximum mass density across the boundary layer and that the transverse turbulence scale size is about 10% of the boundary layer thickness. The results indicate that the effect of the turbulent boundary layer is large angle scattering which decreases contrast but not resolution. Using extinction as a criteria the range of acceptable aircraft operating conditions are given. |
| File Size | 1002581 |
| Page Count | 22 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19800017099 |
| Archival Resource Key | ark:/13960/t46q6rw20 |
| Language | English |
| Publisher Date | 1980-04-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Image Resolution Density Measurement Anisotropy Light Scattering Wind Tunnel Tests Imaging Techniques Apertures Turbulent Boundary Layer Aerial Photography Isotropic Turbulence Image Contrast Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
