A Three Platform Experiment On Optical Turbulence In The Marine Boundary Layer
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Author | : Richard Henry Paine |
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Total Pages | : 0 |
Release | : 1977 |
Genre | : Meteorology |
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An observational experiment was conducted in the marine boundary layer off the California coast involving optical turbulence measurements. The measurements were made from a ship, a tethered kite and two C-135 aircraft. Measured values of C(n) squared from the surface to levels above the marine inversion were related to the synoptic weather situation. C(n) squared values were observed to be maximum in the inversion. Near surface C(n) squared values, measured from two levels on the ship, exhibited expected diurnal changes. Overall, C(n) squared values measured optically (scintillation) and meteorologically (from C(T) squared measurements) compared satisfactorily. C(n) squared profiles estimated from surface observed values using a z to the -413 power assumed distribution appeared to define the mean measured profile.
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Total Pages | : 1102 |
Release | : 1991 |
Genre | : Aeronautics |
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Total Pages | : 852 |
Release | : 1977 |
Genre | : Astronautics in earth sciences |
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Total Pages | : 1148 |
Release | : 1989 |
Genre | : Aeronautics |
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Total Pages | : 138 |
Release | : 1978 |
Genre | : Astronautics in earth sciences |
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A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International Aerospace Abstracts (IAA)
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Total Pages | : 1130 |
Release | : 1978 |
Genre | : Research |
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Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 32 |
Release | : 2018-08-13 |
Genre | : |
ISBN | : 9781725140189 |
Incompressible three dimensional, turbulent boundary layer (3DTBL) experiments were simulated numerically by integrating the boundary layer equations together with an algebraic eddy viscosity turbulence model. For the flow treated, the downstream portion, where the crossflow was large, was not predicted with the present computational method; the flow was significantly influenced by elliptic flow field effects. Departures from the boundary layer concept are indicated. Calculations agreed reasonably well with the mean flow development up to separation. In one experiment the normal pressure gradients were found to be neligible in regions with large skewing and allowed testing turbulence models using the boundary layer equations. The simulation of this flow compared favorably with the experimental data throughout the flow field and suggested the applicability of algebraic eddy viscosity models for 3DTBLs. Mueller, U. R. Ames Research Center NASA-TM-84230, A-8873, NAS 1.15:84230 ...
Author | : United States. Office of the Chief of Naval Research |
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Total Pages | : 88 |
Release | : 1992 |
Genre | : Research |
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Author | : United States. Office of Naval Research |
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Total Pages | : 88 |
Release | : 1992 |
Genre | : Research |
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Author | : Eugene Casson Crittenden |
Publisher | : |
Total Pages | : 201 |
Release | : 1978 |
Genre | : Atmospheric turbulence |
ISBN | : |
The effects of turbulence on the performance of imagers or on beam forming optical systems are well expressed by the optical transfer function or its essential equivalents, the modulation transfer function or the mutual coherence function for the atmosphere. These quantities can be adequately expressed in terms of the Fried model by means of a single number, the turbulence structure constant for optical index, (C sub n) squared, provided that a properly path-weighted value is obtained. The behavior as a function of wavelength and range is also well understood. The quantity (C sub n) squared, which varies with the micrometeorology, can be determined in its properly path-weighted form with a slit-scanning telescope system developed at NPS. A portable system is available which includes an on-line data processing system that gives immediate numerical and graphical results for the properties of the atmosphere, together with performance prediction for a given optical system. The direct optical measurement of weighted (C sub n) squared for the path avoids the necessity of making a large number of measurements of (C sub t) squared at points along the path. Measurement of (C sub n) squared by the slit-scanner method also obtains a direct result independent of assumptions as to the statistical form of the turbulence.