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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 181 records · Page 10

All sources NASA NTRS DOE OSTI

NASA NTRS1979

New opportunities for future small civil turbine engines: Overviewing the GATE studies

An overview of four independent studies forecasts the potential impact of advanced technology turbine engines in the post 1988 market, identifies important aircraft and missions, desirable engine sizes, engine performance, and cost goals. Parametric evaluations of various engine cycles, configurations, design features, and advanced technology elements defined baseline conceptual engines for each of the important missions identified by the market analysis. Both fixed-wing and helicopter aircraft, and turboshaft, turboprop, and turbofan engines were considered. Sizable performance gains (e.g., 20% SFC decrease), and large engine cost reductions of sufficient magnitude are predicted to challenge the reciprocating engine in the 300-500 SHP class.

Strack, W. C.↗

NASA NTRS1979

Overview of the carbon fiber problem

Carbon fibers (CF) composite structures are being utilized more as alternatives to metals in both civilian and military applications. They are valued for their light weight and high strength as well as for their ease of designing structures with specific shapes and sizes. However, a problem may exist due to the high conductivity of CF. CF are manufactured from a precursor material which is subjected to great stress and heat treatment causing a change in the physical and electrical properties. The fibers are bound together by a matrix of epoxy. In the event of fire (aircraft accident) the epoxy would burn away releasing these fibers into the atmosphere. When these fibers come in contact with electronic equipment, they might cause damage to by settling on electrical junctions. An overview is given of the objectives for a study, and the approach and methodology developed for determination of risk profiles.

Source record↗

NASA NTRS1978

Satellite power systems /SPS/ overview

The concept of using a number of very large satellites in geostationary equatorial orbit to convert solar energy into electricity and then to microwave energy transmitted back to earth is given a brief historical overview. The major program elements and organizational responsibilities in the DOE/NASA program for satellite power systems are schematized. The timetable calls for preliminary program recommendations in May, 1979, and final program recommendations in June, 1980. With the exception of the microwave effects studies, all work will be analytical. Overall funding for the effort has been set at $15.6 million.

Larock, R. I.↗

NASA NTRS1978

Overview of future programs - USA

An overview of U.S. manned space flight is presented and recent advanced studies are considered. In connection with long range mission planning, studies are being conducted of future space systems, space vehicles, and space operations. An early Space Construction Base is being studied for launch in 1985 and associated geosynchronous operations are projected for 1987. The Space Construction Base is envisioned as a facility for erecting large structures in space, for basing Manned Orbital Transfer Vehicles that operate between low earth orbit and geosynchronous orbit; and for the conduct of industrial operations and scientific experiments in space. Ways and means for erecting large structures in space are examined. One particular plan involves the development of the technology to demonstrate the capabilities of a solar power station to translate solar energy to electrical energy for use on commercial power stations on earth. Advanced transportation is also being studied, particularly for needs that complement the Shuttle. The use of the Shuttle System as a Heavy Lift Launch Vehicle to place large diameter payloads up to 200,000 pounds in weight is also being explored.

Freitag, R. F.↗

NASA NTRS1979

Overview and outline of Mass-Driver Two

An overview of the Princeton-M.I.T. second mass-driver is presented. Mass-Driver Two is a 13.1 cm caliber system which uses a two coil superconducting bucket and a two-phase in quadrature drive system. Discrete drive coils are individually energized with timing supplied by position-sensing optical detectors. Intermediate energy storage is provided by sector capacitors which are recharged every half cycle by an external power source. A vacuum environment is provided for the superconducting bucket by a 4 inch ID glass pipe with the drive coils surrounding it. Magnetic flight is generated by eddy current repulsion from six copper guide strips lining the glass pipe. The length is 2.5 meters equally divided between acceleration and deceleration sections. Nominal acceleration is 5000 m/sec per sec giving a maximum bucket velocity of 112 m/sec. Regenerative braking is used to decelerate the bucket. Current densities of 25 sq cm are achieved in the superconducting bucket coils and are maintained by a cryogenic service station.

Oneill, G. K.↗

NASA NTRS1979

New opportunities for future small civil turbine engines - Overviewing the GATE studies

This paper presents an overview of four independent studies that explore the opportunities for future General Aviation Turbine Engines (GATE) in the 150-1000 SHP class. Detroit Diesel Allison, Garrett/AiResearch, Teledyne CAE, and Williams Research participated along with several airframers. These studies forecasted the potential impact of advanced technology turbine engines in the post-1988 market, identified important aircraft and missions, desirable engine sizes, engine performance and cost goals. Parametric evaluations of various engine cycles, configurations, design features, and advanced technology elements defined baseline conceptual engines for each of the important missions identified by the market analysis. Both fixed-wing and helicopter aircraft, and turboshaft, turboprop, and turbofan engines were considered. All four companies predicted sizable performance gains (e.g., 20% SFC decrease), and three predicted large engine cost reductions of sufficient magnitude to challenge the reciprocating engine in the 300-500 SHP class. Key technology areas were recommended for NASA support in order to realize these improvements.

Strack, W. C.↗

NASA NTRS1980

Industrial storage applications overview

The implementation of a technology demonstration for the food processing industry, development and technology demonstrations for selected near-term, in-plant applications and advanced industrial applications of thermal energy storage are overviewed.

Duscha, R. A.↗

NASA NTRS1980

Overview of recent aero-optics flight tests

A chronological overview of aero-optics test flights is presented highlighting the objectives and conclusions from the tests. Flight tests performed in coordination with the PRESS reentry observation missions and the ALL Cycle 2 laser propagation and tracking demonstrations are described addressing the identification and quantification of distortion phenomena. Finally, current aero-optics flight investigations of an atmospheric turbulence probe are briefly discussed.

Otten, L. J., III↗

NASA NTRS1980

Combustion technology overview

An overview of combustor technology developments required for use of broadened property fuels in jet aircraft is presented. The intent of current investigations is to determine the extent to which fuel properties can be varied, to obtain a data base of combustion - fuel quality effects, and to determine the trade-offs associated with broadened property fuels. Subcomponents of in-service combustors such as fuel injectors and liners, as well as air distributions and stoichiometry, are being altered to determine the extent to which fuel flexibility can be extended. Finally, very advanced technology consisting of new combustor concepts is being evolved to optimize the fuel flexibility of gas turbine combustors.

Niedzwiecki, R. W.↗

NASA NTRS1980

Overview of integrated programs for aerospace-vehicle design (IPAD)

An overview of a joint industry/government project, denoted Integrated Programs for Aerospace-Vehicle Design (IPAD), which focuses on development of technology and associated software for integrated company-wide management of engineering information is presented. Results to date are summarized and include an in-depth documentation of a representative design process for a large engineering project, the definition and design of computer-aided design software needed to support that process, and the release of prototype software to integrated selected design functions.

Fulton, R. E.↗

NASA NTRS1979

An overview of the Landsat-D project with emphasis on the flight segment

The purpose of the paper is to provide an overview of the Landsat-D project and the present status in terms of the configuration and assembly of the various components comprising the overall Landsat-D system. The two major segments are the flight segment and the ground segment. Although descriptions of the components in both segments are provided, emphasis is placed on describing the flight segment.

Salomonson, V. V.↗

NASA NTRS1979

An overview of the NASA satellite communications program

This overview sets the framework for five descriptive papers from NASA Field Centers where satellite communications research and development is being conducted. A review of events of 1973-78 in the Federal Government, in industry, and in professional organizations are shown to have contributed to the formulation of new policy supporting the establishment of renewed efforts within NASA toward improved use of the spectrum and orbit for communications. The work will focus on the development of 'frequency re-use' technology, including multi-beam antennas and on-board switching for future spacecraft. This paper treats the planning issues and the approaches taken toward forming a coherent program from the sustaining efforts of the recent past. Companion papers highlight the methods, the technology, and the activities that are assisting in the transition to a new program.

Dement, D. K.↗

NASA NTRS1980

Atmospheric laser Doppler velocimetry - An overview

Research, development, and application of atmospheric laser Doppler velocimetry are overviewed. Consideration is given to operation principles of CO2 heterodyne systems. Global wind, pollution, V/STOL flow, and true airspeed measurements are outlined. Wind energy, dust devils, water spouts, tornadoes, and aircraft wake vortices are covered.

Bilbro, J. W.↗

NASA NTRS1980

Overview of stall/spin technology

A general overview of the current state of the art in stall/spin technology for highly-maneuverable military configurations and light general aviation configurations is presented. The key areas of predictive methods, aerodynamics, and flight controls are discussed, using illustrations of results obtained during recent studies. In addition, some of the more-pertinent near-term and future challenges and opportunities in stall/spin technology are discussed. This survey of the existing technology shows that rapid progress has been achieved in each of the key technical areas during the last decade, especially for military airplanes. However, a significant amount of innovative research is urgently required in order to improve the productivity and capabilities of existing predictive techniques, and to provide the technology required for advanced, unconventional configurations.

Chambers, J. R.↗

NASA NTRS1981

Overview: DOE/NASA automotive gas turbine and stirling projects

An overview on the progress of the automotive gas turbine and automotive Stirling engine technology projects is presented. The following items are reported: (1) formulation and execution of projects in accordance with the Auto Propulsion Research and Development Act of 1978; (2) substantive technology accomplishments; and (3) future path options of the programs.

Beremand, D. G.↗

NASA NTRS1980

The Earth Radiation Budget Experiment /ERBE/ - An overview

An overview of the Earth Radiation Budget Experiment (ERBE) is presented along with a brief history relative to the evolution of the ERBE science measurement requirements. A description of the ERBE instrument is presented which includes both the non-scanner and scanner instrument packages. In addition, ERBE science investigations are summarized. The ERBE, to be flown on a three-satellite mission in the 1980's will, for the first time, provide radiation measurements with sufficient spatial and temporal resolution to determine the monthly average radiation budget on regional, zonal, and global scales and the diurnal variation on regional and monthly scales.

Barkstrom, B. R.↗

NASA NTRS1981

Science and Applications Space Platforms - A NASA overview

An overview of past, present, and future activities relating to space platforms is presented, with emphasis placed on implementation of the initial platform. It is noted that the challenge at present is to define an initial system that can accommodate high priority science, that possesses the capability of doing multi-discipline science, and that demonstrates on-orbit servicing and payload exchange through use of the Shuttle. The evolution of the Science and Applications Space Platform (SASP), which will provide significantly more time on-orbit for instrument operations without increasing Space Shuttle orbiter time on-orbit, is traced. The importance of completing all required activities to support a new start for the SASP in fiscal year 1983 is stressed. While the initial SASP will support only a limited set of investigations, the program will evolve by replication, upgrading, or the development of new systems to support a broader and generally more demanding set of system requirements.

De Sanctis, C. E.↗

NASA NTRS1981

Quantitative simulation of a magnetospheric substorm. I - Model logic and overview

Results of a comprehensive computer simulation of the behavior of the earth's inner magnetosphere during a substorm-type event are reported. It is pointed out that the computer model self-consistently computes electric fields, currents, and plasma distributions and velocities in the inner-magnetosphere/ionosphere system; parallel electric fields and ionospheric neutral winds, however, are not included. The basic equations of the model are derived, and the inputs are described. An overview of the results is also given. The first appendix contains derivations of general, useful laws of bounce-averaged gradient, curvature, and E x B drifts in a plasma with isotropic pitch angle distribution. The second appendix gives a description of the numerical method used in the simulation.

Harel, M.↗