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  • ENERGY PRODUCTION AND CONVERSION  (2,591)
  • AERODYNAMICS  (2,091)
  • Biochemistry and Biotechnology  (1,710)
  • 1980-1984  (6,392)
Collection
Keywords
Publisher
Years
Year
  • 1
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    Multidomain approach for calculating compressible flows (1982)
    In:  CASI
    Details
    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
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Current developments lighter than air systems (1981)
    In:  CASI
    Details
    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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    NASA TECHNICAL REPORTS
  • 3
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    Review of NASA programs in applying aerospace technology to energy (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: NASA's role in energy research and development, with the aid of aerospace technology, is reviewed. A brief history, which began in 1974 with studies of solar energy systems on earth, is presented, and the major energy programs, consisting of over 60 different projects, are described, and include solar terrestrial systems, conservation and fossil energy systems, and space utilization systems. Special attention is given to the Satellite Power System and the isolation of nuclear wastes in space. Emerging prospects for NASA programs in energy technology include bioenergy, and ocean thermal energy conversion, coal extraction and conversion technologies, and support to the nuclear industry in power plant systems safety.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: AAS 80-218 , Annual Meeting Space - Enhancing technological leadership; Oct 20, 1980 - Oct 23, 1980; Boston, MA
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Experimental investigation of the flow on the suction side of a thin Delta wing (1981)
    In:  CASI
    Details
    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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    NASA TECHNICAL REPORTS
  • 5
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    The influence of a high pressure gradient on unsteady velocity perturbations in the case of a turbulent supersonic flow (1980)
    In:  CASI
    Details
    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
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Energy fact sheet (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-NEWS-RELEASE-80-59 , P80-10088
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Energy fact sheet (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-NEWS-RELEASE-80-59A
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Energy: A continuing bibliography with indexes (1982)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: This bibliography lists 881 reports, articles, and other documents introduced into the NASA scientific and technical information system from July 1, 1982 through September 30, 1982.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-SP-7043(35) , NAS 1.21:7043(35)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Unsteady effects of a control surface in two dimensional subsonic and transonic flow (1980)
    In:  CASI
    Details
    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
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    The SPS concept - An overview of status and outlook (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The satellite power system (SPS) concept has been reviewed and assessed in a concept development and evaluation program. This paper presents the results of the assessment in systems definition, environmental factors, social impacts, and comparison of future energy systems. Although no insurmountable objections to SPS have been identified, there remain issues that can be resolved only through further research.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Energy to the 21st century; Aug 18, 1980 - Aug 22, 1980; Seattle, WA
    Format: text
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    NASA TECHNICAL REPORTS
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