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  • 1
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    Progress of Stirling cycle analysis and loss mechanism characterization (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An assessment of Stirling engine thermodynamic modeling and design codes shows a general deficiency; this deficiency is due to poor understanding of the fluid flow and heat transfer phenomena that occur in the oscillating flow and pressure level environment within the engines. Stirling engine thermodynamic loss mechanisms are listed. Several experimental and computational research efforts now underway to characterize various loss mechanisms are reviewed. The need for additional experimental rigs and rig upgrades is discussed. Recent developments and current efforts in Stirling engine thermodynamic modeling are also reviewed.
    Keywords: URBAN TECHNOLOGY AND TRANSPORTATION
    Type: NASA-TM-88891 , DOE/NASA-50112/67 , E-3302 , NAS 1.15:88891
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Downsizing assessment of automotive Stirling engines (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A 67 kW (90 hp) Stirling engine design, sized for use in a 1984 1440 kg (3170 lb) automobile was the focal point for developing automotive Stirling engine technology. Since recent trends are towards lighter vehicles, an assessment was made of the applicability of the Stirling technology being developed for smaller, lower power engines. Using both the Philips scaling laws and a Lewis Research Center (Lewis) Stirling engine performance code, dimensional and performance characteristics were determined for a 26 kW (35 hp) and a 37 kW (50 hp) engine for use in a nominal 907 kg (2000 lb) vehicle. Key engine elements were sized and stressed and mechanical layouts were made to ensure mechanical fit and integrity of the engines. Fuel economy estimates indicated that the Stirling engine would maintain a 30 to 45 percent fuel economy advantage comparable spark ignition and diesel powered vehicles in the 1984 period.
    Keywords: URBAN TECHNOLOGY AND TRANSPORTATION
    Type: NASA-TM-83468 , E-1783 , NAS 1.15:83468 , NASA/DOE/51040-49
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Analysis of regenerated single-shaft ceramic gas-turbine engines and resulting fuel economy in a compact car (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Ranges in design and off-design operating conditions of an advanced gas turbine and their effects on fuel economy were analyzed. The assumed engine incorporated a single stage radial flow turbine and compressor with fixed geometry. Fuel economies were calculated over the composite driving cycle with gasoline as the fuel. At a constant turbine-inlet temperature, with a regenerator sized for a full power effectiveness the best fuel economies ranged from 11.1 to 10.2 km/liter (26.2 to 22.5 mpg) for full power turbine tip speeds of 770 to 488m/sec (2530 to 1600ft/sec), respectively.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-X-3531 , E-9103
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Computer program for Stirling engine performance calculations (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The thermodynamic characteristics of the Stirling engine were analyzed and modeled on a computer to support its development as a possible alternative to the automobile spark ignition engine. The computer model is documented. The documentation includes a user's manual, symbols list, a test case, comparison of model predictions with test results, and a description of the analytical equations used in the model.
    Keywords: URBAN TECHNOLOGY AND TRANSPORTATION
    Type: NASA-TM-82960 , DOE/NASA/51040-42 , E-1377 , NAS 1.15:82960
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Initial comparison of single cylinder Stirling engine computer model predictions with test results (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A NASA developed digital computer code for a Stirling engine, modelling the performance of a single cylinder rhombic drive ground performance unit (GPU), is presented and its predictions are compared to test results. The GPU engine incorporates eight regenerator/cooler units and the engine working space is modelled by thirteen control volumes. The model calculates indicated power and efficiency for a given engine speed, mean pressure, heater and expansion space metal temperatures and cooler water inlet temperature and flow rate. Comparison of predicted and observed powers implies that the reference pressure drop calculations underestimate actual pressure drop, possibly due to oil contamination in the regenerator/cooler units, methane contamination in the working gas or the underestimation of mechanical loss. For a working gas of hydrogen, the predicted values of brake power are from 0 to 6% higher than experimental values, and brake efficiency is 6 to 16% higher, while for helium the predicted brake power and efficiency are 2 to 15% higher than the experimental.
    Keywords: MECHANICAL ENGINEERING
    Type: SAE PAPER 790327
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Comparison of free-piston Stirling engine model predictions with RE1000 engine test data (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Predictions of a free-piston Stirling engine model are compared with RE1000 engine test data taken at NASA-Lewis Research Center. The model validation and the engine testing are being done under a joint interagency agreement between the Department of Energy's Oak Ridge National Laboratory and NASA-Lewis. A kinematic code developed at Lewis was upgraded to permit simulation of free-piston engine performance; it was further upgraded and modified at Lewis and is currently being validated. The model predicts engine performance by numerical integration of equations for each control volume in the working space. Piston motions are determined by numerical integration of the force balance on each piston or can be specified as Fourier series. In addition, the model Fourier analyzes the various piston forces to permit the construction of phasor force diagrams. The paper compares predicted and experimental values of power and efficiency and shows phasor force diagrams for the RE1000 engine displacer and piston. Further development plans for the model are also discussed.
    Keywords: URBAN TECHNOLOGY AND TRANSPORTATION
    Type: NASA-TM-83650 , E-2095 , DOE/NASA/1005-3 , NAS 1.15:83650 , Intersoc. Energy Conversion Eng. Conf.; Aug 19, 1984 - Aug 24, 1984; San Francisco, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Baseline performance of the GPU 3 Stirling engine (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A 10 horsepower single-cylinder rhombic-drive Stirling engine was converted to a research configuration to obtain data for validation of Stirling computer simulations. The engine was originally built by General Motors Research Laboratories for the U.S. Army in 1965 as part of a 3 kW engine-generator set, designated the GHU 3 (Ground Power Unit). This report presents test results for a range of heater gas temperatures, mean compression-space pressures, and engine speeds with both helium and hydrogen as the working fluids. Also shown are initial data comparisons with computer simulation predictions.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-79038 , E-9839 , DOE/NASA/1040-78/5 , Highway Vehicle Systems Contractors Coordination Meeting; Oct 17, 1978 - Oct 20, 1978; Dearborn, MI; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Initial Comparison of Single Cylinder Stirling Engine Computer Model Predictions with Test Results (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A Stirling engine digital computer model developed at NASA Lewis Research Center was configured to predict the performance of the GPU-3 single-cylinder rhombic drive engine. Revisions to the basic equations and assumptions are discussed. Model predictions with the early results of the Lewis Research Center GPU-3 tests are compared.
    Keywords: URBAN TECHNOLOGY AND TRANSPORTATION
    Type: NASA-TM-79044 , DOE/NASA/1040-78/30 , E-9848 , Intern. Congr. and Exposition; Feb 26, 1979 - Mar 04, 1979; Detroit. MI; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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