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  • ENERGY PRODUCTION AND CONVERSION  (452)
  • AERODYNAMICS  (383)
  • Fisheries
  • Industrial Chemistry
  • 2020-2023
  • 1975-1979  (836)
  • 1950-1954
  • 1977  (836)
Collection
Keywords
Publisher
Years
  • 2020-2023
  • 1975-1979  (836)
  • 1950-1954
Year
  • 1
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    Turbulence modeling of shock separated boundary-layer flows (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Computations of transonic and hypersonic shock-separated boundary-layer flows using zero-equation (algebraic), one-equation (kinetic energy), and two-equation (kinetic energy plus length scale) turbulence eddy viscosity models are described and compared with measurements. The computations make use of a new Navier-Stokes computer algorithm that has reduced computing times by one to two orders of magnitude. The algorithm, and how the turbulence models are incorporated into it, are described. Results for the transonic flow show that the unmodified one-equation model is superior to the zero-equation model in skin-friction predictions. For the hypersonic flow, a highly modified one-equation model that accurately predicts surface pressure and heat transfer is described. Preliminary two-equation model results are also presented.
    Keywords: AERODYNAMICS
    Type: Symposium on Turbulent Shear Flows; Apr 18, 1977 - Apr 20, 1977; University Park, PA
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Computation of unsteady transonic flows by the indicial method (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The indicial method is investigated for the computation of unsteady transonic force and moment coefficients for use in flutter analyses. This approach has the advantage that solutions for all reduced frequencies for a given mode of motion can be obtained from a single finite-difference flowfield computation. Comparisons of indicial and time-integration computations for oscillating airfoil and flap motions help define limits on the motion amplitude for the applicability of the indicial method to transonic flows. Within these limits, solutions for various motion modes can be superposed to obtain solutions for multiple-degree-of-freedom aeroelastic systems. Also, a simple aeroelastic problem is solved by an alternative approach in which the structural motion and flowfield equations are integrated simultaneously using a time-integration finite-difference procedure.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 77-447 , Mar 24, 1977 - Mar 25, 1977|Conference on Structures, Structural Dynamics and Materials; Mar 21, 1977 - Mar 23, 1977; San Diego, CA; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Energy: A continuing bibliography with indexes, issue 12 (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: This bibliography lists 584 reports, articles, and other documents introduced into the NASA scientific and technical information system from October 1, 1976 through December 31, 1976.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-SP-7043(12)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Space solar power. Description of concept, results of preliminary studies, requirements for evaluation (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The nation is actively pursuing alternate sources of energy because of the problems or concerns related to obtaining required energy for the future from oil, gas, nuclear, and coal sources. Solar energy is an obvious candidate for consideration. Its use in the past has been limited by the relative cost of collecting and converting solar energy into electrical power. The increasing costs of other energy sources will make solar energy more attractive. During recent years a new concept for the collection of solar energy has been developed. This concept involves the location of solar power stations in space. The concept, results of preliminary studies, and requirements for space evaluation of such a project are discussed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-79436
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Flutter analysis of a glider made of synthetic materials (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A description of the flutter behavior of the Standard Cirrus is given. Steady vibration tests were conducted, and vibration and flutter calculations were made.
    Keywords: AERODYNAMICS
    Type: NASA-TM-75160
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    NASA's OAST program: An overview (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The program was split into four areas which include: high energy density, long life batteries; low cost high capacity battery application; very high energy density batteries; and electrochemical research and technology program. Outlines are presented which show the approaches used and the accomplishments of each program area.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Goddard Space Flight Center The 1977 Goddard Space Flight Center Battery Workshop; p 111-118
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    A survey of computational aerodynamics in the United States (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Programs in theoretical and computational aerodynamics in the United States are described. Those aspects of programs that relate to aeronautics are detailed. The role of analysis at various levels of sophistication is discussed as well as the inverse solution techniques that are of primary importance in design methodology. The research is divided into the broad categories of application for boundary layer flow, Navier-Stokes turbulence modeling, internal flows, two-dimensional configurations, subsonic and supersonic aircraft, transonic aircraft, and the space shuttle. A survey of representative work in each area is presented.
    Keywords: AERODYNAMICS
    Type: NASA-SP-394
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Formation of stored heat by means of bled steam during times of load reduction and its use in peak load times (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Technical possibilities and economic advantages of integrating hot water storage systems into power plants fired with fossil fuels are discussed. The systems can be charged during times of load reduction and then used for back-up during peak load periods. Investment costs are higher for such systems than for gas turbine power plants fired with natural gas or light oil installed to meet peak load demand. However, by improving specific heat consumption by about 1,000 kcal/k ohm, which thus reduces the related costs, investment costs will be compensated for, so that power production costs will not increase.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-75147
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Boeing selected to build world's largest windmill (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-NEWS-RELEASE-77-141 , P77-10139
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Energy: A continuing bibliography with indexes, issue 15 (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: This bibliography lists 1112 reports, articles, and other documents introduced into the NASA scientific and technical information system from July 1, 1977 through September 30, 1977.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-SP-7043(15)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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