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  • 1
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    Advanced supersonic propulsion study, phases 3 and 4 (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An evaluation of various advanced propulsion concepts for supersonic cruise aircraft resulted in the identification of the double-bypass variable cycle engine as the most promising concept. This engine design utilizes special variable geometry components and an annular exhaust nozzle to provide high take-off thrust and low jet noise. The engine also provides good performance at both supersonic cruise and subsonic cruise. Emission characteristics are excellent. The advanced technology double-bypass variable cycle engine offers an improvement in aircraft range performance relative to earlier supersonic jet engine designs and yet at a lower level of engine noise. Research and technology programs required in certain design areas for this engine concept to realize its potential benefits include refined parametric analysis of selected variable cycle engines, screening of additional unconventional concepts, and engine preliminary design studies. Required critical technology programs are summarized.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-135236 , R77AEG635
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Advanced supersonic technology propulsion system study (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: This study had the objectives of determining the most promising conventional and variable cycle engine types; the effect of design cruise Mach number (2.2, 2.7 and 3.2) on a commercial supersonic transport; effect of advanced engine technology on the choice of engine cycle; and effect of utilizing hydrogen as the engine fuel. The technology required for the engines was defined, and the levels of development to ensure availability of this technology in advanced aircraft propulsion systems were assessed. No clearcut best conventional or variable cycle engine was identified. The dry bypass turbojet and the duct burning turbofans were initially selected as the best conventional engines, but later results, utilizing augmentation at takeoff, added the mixed-flow augmented turbofan as a promising contender. The modulating air flow, three-rotor variable cycle engine identified the performance features desired from VCE concepts (elimination of inlet drag and reduction in afterbody drag), but was a very heavy and complex engine.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-CR-143634 , R74AEG330
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Advanced supersonic propulsion system technology study, phase 2 (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Variable cycle engines were identified, based on the mixed-flow low-bypass-ratio augmented turbofan cycle, which has shown excellent range capability in the AST airplane. The best mixed-flow augmented turbofan engine was selected based on range in the AST Baseline Airplane. Selected variable cycle engine features were added to this best conventional baseline engine, and the Dual-Cycle VCE and Double-Bypass VCE were defined. The conventional mixed-flow turbofan and the Double-Bypass VCE were on the subjects of engine preliminary design studies to determine mechanical feasibility, confirm weight and dimensional estimates, and identify the necessary technology considered not yet available. Critical engine components were studied and incorporated into the variable cycle engine design.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-134913 , R75AEG508
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Definition study of a Variable Cycle Experimental Engine (VCEE) and associated test program and test plan (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Definition Study of a Variable Cycle Experimental Engine (VCEE) and Associated Test Program and Test Plan, was initiated to identify the most cost effective program for a follow-on to the AST Test Bed Program. The VCEE Study defined various subscale VCE's based on different available core engine components, and a full scale VCEE utilizing current technology. The cycles were selected, preliminary design accomplished and program plans and engineering costs developed for several program options. In addition to the VCEE program plans and options, a limited effort was applied to identifying programs that could logically be accomplished on the AST Test Bed Program VCE to extend the usefulness of this test hardware. Component programs were provided that could be accomplished prior to the start of a VCEE program.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-159419 , R78AEG568
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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