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  • Chemical Engineering  (2,598)
  • AERODYNAMICS  (2,116)
  • Meteorology and Climatology
  • 2005-2009  (1,263)
  • 1980-1984  (4,701)
  • 1945-1949  (38)
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  • 1
    Publication Date: 2019-08-28
    Description: This viewgraph presentation discusses the implementation of the Committee on Earth Observation Satellites (CEOS) precipitation constellation. The contents include: 1) Why a constellation; 2) Who is working on it; 3) Where are we; 4) Where are we going; and 5) What is the approach.
    Keywords: Meteorology and Climatology
    Type: CRSS/ASPRS 2007 Specialty Conference; Oct 30, 2007 - Oct 31, 2007; Ottawa; Canada
    Format: application/pdf
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  • 2
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    In:  CASI
    Publication Date: 2019-08-28
    Description: The Workshop on Satellite Meteorology is co-sponsored by the Cooperative Institute for Research in the Atmosphere (CIRA) at Colorado State University and the American Meteorlogical Society's Committee on Meteorological Aspects of Aerospace Systems. The workshop covers uses of satellite data in atmospheric science. It provides state-of-the-art information to those in Universities, research groups, and other users. One area of primary focus is to provide source material to university personnel for developing and augmenting courses in satellite meteorology and the atmospheric sciences. The items in the program include information on meteorological satellites and data sources, uses of satellite imagery for all scales of weather analysis and forecasting, uses of sounding data and other radiance information and research opportunities on interactive systems. Each session is presented by a group of experts in the field and includes an open discussion of the state-of-the-art and promising areas for future development. This pre-print volume is one of three parts on the workshop. The three parts are: PART I. Satellites and Their Data; PART II. Satellite Image Analysis and Interpretation; PART III. Satellite Soundings and Their Uses.
    Keywords: Meteorology and Climatology
    Type: Workshop on Satellite Meteorology; Jul 19, 1982 - Jul 23, 1982; Fort Collins, CO; United States
    Format: text
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  • 3
    Publication Date: 2019-08-28
    Description: A multidomain approach for calculating compressible flows by using unsteady or pseudo-unsteady methods is presented. This approach is based on a general technique of connecting together two domains in which hyperbolic systems (that may differ) are solved with the aid of compatibility relations associated with these systems. Some examples of this approach's application to calculating transonic flows in ideal fluids are shown, particularly the adjustment of shock waves. The approach is then applied to treating a shock/boundary layer interaction problem in a transonic channel.
    Keywords: AERODYNAMICS
    Type: NASA-TM-76692 , NAS 1.15:76692
    Format: application/pdf
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  • 4
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    In:  CASI
    Publication Date: 2019-08-28
    Description: Lighter than air aircraft (LTA) developments and research in the United States and other countries are reviewed. The emphasis in the U.S. is on VTOL airships capable of heavy lift, and on long endurance types for coastal maritime patrol. Design concepts include hybrids which combine heavier than air and LTA components and characteristics. Research programs are concentrated on aerodynamics, flight dynamics, and control of hybrid types.
    Keywords: AERODYNAMICS
    Type: NASA-TM-84744 , NAS 1.15:84744
    Format: application/pdf
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  • 5
    Publication Date: 2019-08-28
    Description: Surface oil flow patterns were photographed and pressure distribution measurements were carried out on a sharp edged delta wing of aspect ratio lambda = 1.0 in order to determine the influence of Reynolds number and of vortex breakdown on the flow on the suction side of the wing. The formation of the secondary vortex occurs due to separation of a laminar boundary layer in the front part of the wing and due to separation of a turbulent boundary layer in the rear part of the wing. In the case of turbulent separation, the secondary separation line is closer to the wing leading edge than in the laminar case. The position of the transition depends on the Reynolds number and on the angle of incidence. The breakdown of a vortex above the wing leads to a kink in the secondary separation line.
    Keywords: AERODYNAMICS
    Type: NASA-TM-75897
    Format: application/pdf
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  • 6
    Publication Date: 2019-08-28
    Description: The amplification or reduction of unsteady velocity perturbations under the influence of strong flow acceleration or deceleration was studied. Supersonic flows with large velocity, pressure gradients, and the conditions in which the velocity fluctuations depend on the action of the average gradients of pressure and velocity rather than turbulence, are described. Results are analyzed statistically and interpreted as a return to laminar process. It is shown that this return to laminar implies negative values in the turbulence production terms for kinetic energy. A simple geometrical representation of the Reynolds stress production is given.
    Keywords: AERODYNAMICS
    Type: NASA-TM-75236 , AAF-NT-79-10 , Colloq. d''Aerodynamique Appl.; Nov 07, 1978 - Nov 09, 1978; Marseille; France|Jul 01, 1979
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  • 7
    Publication Date: 2019-08-28
    Description: The experimental results of steady and unsteady pressure measurements, carried out in subsonic and transonic flow on a 16 percent relative thickness supercritical aerofoil, equipped with a trailing edge flap involving 25 percent of the chord, in a sinusoidal motion are given. These experimental results are compared with those obtained by various methods of steady and unsteady inviscid flow calculations. Some calculation results in which viscous effects have been taken into account, for both steady and unsteady flows, are also presented.
    Keywords: AERODYNAMICS
    Type: NASA-TM-75775 , AGARD-CP-262
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  • 8
    Publication Date: 2019-08-28
    Description: Simplified models of the vortex distribution over cylindrical surfaces are developed. The effect of a change of vortex strength was analyzed quantitatively by menas of potential theory. The considerable bulging of the cylindrical vortex sheet as a consequence of the change of the vortex strength is discussed. The coiling-up of the vortices rotation in opposite directions over the cylindrical surface renders the condition for instability and the subsequent large spreading of the vortex core. These processes occur without a positive pressure gradient being necessary in the field of flow surrounding the coiled up vortex sheet.
    Keywords: AERODYNAMICS
    Type: NASA-TM-75862
    Format: application/pdf
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  • 9
    Publication Date: 2019-08-28
    Description: The flow characteristics of rectangular bodies mounted on the base area of a rectangular closed wind tunnel are investigated. As many as four bodies are mounted in line with equal distances between successive bodies. The Mach number of the flowing air is in the range from 0.1 to 0.5. Total and individual drag values could be charged within a wide range by a suitable selection of the distance between successive bodies.
    Keywords: AERODYNAMICS
    Type: NASA-TM-75788
    Format: application/pdf
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  • 10
    Publication Date: 2019-08-28
    Description: The DFLR-F4 wing-body combination is studied. The 1/38 model is formed by a 9.5 aspect ratio transonic wing and an Airbus A 310 fuselage. The F4 wing geometrical characteristics are described and the main experimental results obtained in the S2MA wind tunnel are discussed. Both wing-fuselage interferences and viscous effects, which are important on the wing due to a high rear loading, are investigated by performing 3D calculations. An attempt is made to find their limitations.
    Keywords: AERODYNAMICS
    Type: NASA-TM-76878 , NAS 1.15:76878
    Format: application/pdf
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