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  • Organic Chemistry  (693)
  • SOLAR PHYSICS  (258)
  • AIRCRAFT PROPULSION AND POWER
  • 1975-1979  (1,191)
  • 1976  (1,191)
Collection
Keywords
Publisher
Years
  • 1975-1979  (1,191)
Year
  • 1
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    Summary of NASA aerodynamic and heat transfer studies in turbine vanes and blades (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Aerodynamic effects of trailing edge geometry, hole size, angle, spacing, and shape have been studied in two- and three-dimensional cascades and in a warm turbine test series. Heat transfer studies have been carried out in various two- and three-dimensional test facilities in order to provide corresponding heat transfer data. Results are shown in terms of cooling effectiveness and aerodynamic efficiency for various coolant fractions, coolant-primary temperature ratios, and cooling configurations.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: SAE PAPER 760917
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Solar and magnetospheric science (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The current status of the Solar Physics Program and the Magnetospheric Physics Program is discussed. The scientific context for each of the programs is presented, then the current programs and future plans are outlined.
    Keywords: SOLAR PHYSICS
    Type: NASA-TM-X-3440
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    ATM observations - X-ray results (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Preliminary results of the solar X-ray observations from Skylab are reviewed which indicate a highly structured nature for the corona, with closed magnetic-loop structures over a wide range of size scales. A description of the S-054 experiments is provided, and values are given for the parameters - including size, density, and temperature - describing a variety of typical coronal features. The structure and evolution of active regions, coronal holes, and bright points are discussed.
    Keywords: SOLAR PHYSICS
    Type: Astrophysics and Space Science; 39; Jan. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    An atlas of coronal hole boundary positions May 28 to November 21, 1973 (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 46; Feb. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Alternatives for Jet Engine Control (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Approaches are developed as alternatives to current design methods which rely heavily on linear quadratic and Riccati equation methods. The main alternatives are discussed in two broad categories, local multivariable frequency domain methods and global nonlinear optimal methods.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-146531
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Coronal holes as sources of solar wind (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-13
    Description: We investigate the association of high-speed solar wind with coronal holes during the Skylab mission by: (1) direct comparison of solar wind and coronal X-ray data; (2) comparison of near-equatorial coronal hole area with maximum solar wind velocity in the associated streams; and (3) examination of the correlation between solar and interplanetary magnetic polarities. We find that all large near-equatorial coronal holes seen during the Skylab period were associated with high-velocity solar wind streams observed at 1 AU.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 46; Feb. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Flare build-up study; Proceedings of the Workshop, Falmouth, Mass., September 8-11, 1975 (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The papers deal with problems which might be common to solar flares and earth's magnetosphere, problems associated with the initial phases of the flare phenomenon, the acceleration processes that seem to occur in flares and the magnetosphere, as well as the buildup and storage of flare energy in magnetic-field structures. Topics include the active role of magnetic fields in providing flare energy, current-sheet models of solar flares, the role of plasma turbulence in flare development, similarities and differences between magnetospheric substorms and solar flares, observations of magnetic merging in earth's magnetotail during magnetospheric substorms, evidence for magnetic-energy storage in coronal active regions, the possible role of transition-zone instabilities in preflare energy buildup, and flare energy storage and deposition. Other papers discuss energy release through the interaction of coronal magnetic fields, photospheric electric currents as a source of flare energy, magnetic-energy buildup in the solar atmosphere, magnetic and velocity fields in an active region, flare onset at meter wavelengths, laboratory experiments on field-line reconnection, key problems in auroral flare processes, and the solar-physics Shuttle/Spacelab program. Individual items are announced in this issue.
    Keywords: SOLAR PHYSICS
    Type: Flare build-up study Workshop; Sept. 8-11, 1975; Falmouth, MA; US
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    NASA TECHNICAL REPORTS
  • 8
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    Quiet Clean Short-haul Experimental Engine (QCSEE) whirl test of cam/harmonic pitch change actuation system (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A variable pitch fan actuation system, which incorporates a remote nacelle mounted blade angle regulator, was tested. The regulator drives a rotating fan mounted mechanical actuator through a flexible shaft and differential gear train. The actuator incorporates a high ratio harmonic drive attached to a multitrack spherical cam which changes blade pitch through individual cam follower arms attached to each blade trunnion. Testing of the actuator on a whirl rig, is reported. Results of tests conducted to verify that the unit satisfied the design requirements and was structurally adequate for use in an engine test are presented.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-135140 , HSER-7002
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Evaluation of a staged fuel combustor for turboprop engines (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Proposed EPA emission regulations require emission reduction by 1979 for various gas turbine engine classes. Extensive combustion technology advancements are required to meet the proposed regulations. The T56 turboprop engine requires CO, UHC, and smoke reduction. A staged fuel combustor design was tested on a combustion rig to evaluate emission reduction potential in turboprop engines from fuel zoning. The can-type combustor has separately fueled-pilot and main combustion zones in series. The main zone fueling system was arranged for potential incorporation into the T56 with minor or no modifications to the basic engine. Three combustor variable geometry systems were incorporated to evaluate various airflow distributions. Emission results with fixed geometry operation met all proposed EPA regulations over the EPA LTO cycle. CO reduction was 82 percent, UHC reduction was 96 percent, and smoke reduction was 84 percent. NOx increased 14 percent over the LTO cycle. At high power, NOx reduction was 40 to 55 percent. This NOx reduction has potential application to stationary gas turbine powerplants which have different EPA regulations.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: ASME PAPER 76-WA/GT-5 , Winter Annual Meeting on Pilot project in technology transfer to a developing nation; Dec 05, 1976 - Dec 10, 1976; New York, NY
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    NASA TECHNICAL REPORTS
  • 10
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    Results of correlative studies of a complex solar active region /McMath 12387/ during the Skylab mission (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Results of correlative studies employing Skylab/ATM X-Ray Telescope filter-heliograms, solar magnetograms, and H alpha spectroheliograms of the complex solar active region McMath 12387 for 10-18 June 1973 are presented. Evolutionary changes within the complex region are discussed. Magnetic field calculations, using both potential and force-free models, have been performed and the results are presented. We also determine temperatures, emission measures, and electron densities and show the variation with time of the X-ray emission from the entire complex.
    Keywords: SOLAR PHYSICS
    Type: Symposium and Workshop on Results from Coordinated Upper Atmosphere Measurement Programs; May 29, 1975 - May 31, 1975|Open Meetings of Working Groups on Physical Sciences; May 29, 1975 - Jun 07, 1975; Varna; Bulgaria
    Format: text
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    NASA TECHNICAL REPORTS
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