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  • MECHANICAL ENGINEERING  (3)
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  • 1
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    Upgraded automotive gas turbine engine design and development program, volume 2 (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Results are presented for the design and development of an upgraded engine. The design incorporated technology advancements which resulted from development testing on the Baseline Engine. The final engine performance with all retro-fitted components from the development program showed a value of 91 HP at design speed in contrast to the design value of 104 HP. The design speed SFC was 0.53 versus the goal value of 0.44. The miss in power was primarily due to missing the efficiency targets of small size turbomachinery. Most of the SFC deficit was attributed to missed goals in the heat recovery system relative to regenerator effectiveness and expected values of heat loss. Vehicular fuel consumption, as measured on a chassis dynamometer, for a vehicle inertia weight of 3500 lbs., was 15 MPG for combined urban and highway driving cycles. The baseline engine achieved 8 MPG with a 4500 lb. vehicle. Even though the goal of 18.3 MPG was not achieved with the upgraded engine, there was an improvement in fuel economy of 46% over the baseline engine, for comparable vehicle inertia weight.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-159671 , DOE/NASA/2749-79/2-VOL-2 , COO-2749-43-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Baseline automotive gas turbine engine development program (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Tests results on a baseline engine are presented to document the automotive gas turbine state-of-the-art at the start of the program. The performance characteristics of the engine and of a vehicle powered by this engine are defined. Component improvement concepts in the baseline engine were evaluated on engine dynamometer tests in the complete vehicle on a chassis dynamometer and on road tests. The concepts included advanced combustors, ceramic regenerators, an integrated control system, low cost turbine material, a continuously variable transmission, power-turbine-driven accessories, power augmentation, and linerless insulation in the engine housing.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-159670 , DOE/NASA/2749-79/1-VOL-1 , COO-2749-42
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Conceptual design study of an improved automotive gas turbine powertrain (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Automotive gas turbine concepts with significant technological advantages over the spark ignition (SI) engine were assessed. Possible design concepts were rated with respect to fuel economy and near-term application. A program plan which outlines the development of the improved gas turbine (IGT) concept that best met the goals and objectives of the study identifies the research and development work needed to meet the goal of entering a production engineering phase by 1983. The fuel economy goal is to show at least a 20% improvement over a conventional 1976 SI engine/vehicle system. On the basis of achieving the fuel economy goal, of overall suitability to mechanical design, and of automotive mass production cost, the powertrain selected was a single-shaft engine with a radial turbine and a continuously variable transmission (CVT). Design turbine inlet temperature was 1150 C. Reflecting near-term technology, the turbine rotor would be made of an advanced superalloy, and the transmission would be a hydromechanical CVT. With successful progress in long-lead R&D in ceramic technology and the belt-drive CVT, the turbine inlet temperature would be 1350 C to achieve near-maximum fuel economy.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-159672 , DOE/NASA/2749-79/3-VOL-3 , COO-2749-40
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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