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  • 1
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    Product branching ratios in the reaction of O(1D2) with NH3 (1980)
    American Institute of Physics
    Details
    Publication Date: 1980-11-15
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    Applications to aircraft propulsion systems (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Estimates of the prospects for quiet airplanes in the future are summarized. The SST using afterburning turbojets and no sound suppression is estimated to produce 129 EPNdb on the sideline. Suppression devices and operating techniques can reduce this noise markedly. The present fleet of 707's and DC-8's produces noises nearly as high as 120 decibels on approach. Combinations of sound absorbing devices and engine modifications are expected to give a noise near 100 decibels. The new advanced technology transports (ATT) are being studied with two noise goals in mind: one is 10 decibels and the other is 20 decibels below the FAR level of 106 on takeoff. New trijets using new quiet engines are expected to meet 90 EPNdb. Future advances in technology are expected to yield another 5 decibels to give noise levels of 80 EPNdb. The STOL airplane has a noise goal of 95 EPNdb along a sideline 500 feet from the runway.
    Keywords: AIRCRAFT
    Type: Aircraft Engine Noise Reduction; p 219-246
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The quiet engine program (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Estimates of noise reductions for high bypass ratio engines show that bypass ratio fan noise increases with increasing bypass ratio and dominates above a bypass ratio of about 1.0. Fan noise reduction to the level of jet noise is achieved by elimination of inlet guide vanes, elimination of second fan stage, and increased spacing between rotor and stator. Quiet engine design studies show that, at bypass ratios near 5 or 6 and with low noise fans, noise reductions in the order of 15 to 20 decibels relative to DC-8 and 707 airplanes engines are possible.
    Keywords: AIRCRAFT
    Type: Aircraft Engine Noise Reduction; p 139-142
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Introduction (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Progress reported on principle NASA programs for the reduction of aircraft engine noise emphasizes the Quiet Engine Program. Considered are fan noise and performance, fan noise suppression, and jet noise reduction for a broad spectrum of airplanes including new subsonic airplanes, the older subsonic airplanes in service today, STOL airplanes of the future, and future supersonic transports. Noise reductions achieved in the framework of the Quiet Engine Program are demonstrated and future possible applications of low noise technology to airplanes are discussed.
    Keywords: AIRCRAFT
    Type: Aircraft Engine Noise Reduction; p 1-5
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Jet-engine noise reduction research at naca (1956)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Keywords: unknown
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    V/STOL propulsion (1971)
    In:  CASI
    Details
    Publication Date: 2006-04-20
    Description: Propulsion technology for STOL and V/STOL commercial aircraft
    Keywords: PROPULSION SYSTEMS
    Type: AIRCRAFT PROPULSION 1971; P 135-168
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Quiet engine from NASA (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Engine designs resulting from the NASA sponsored quiet engine program are described in terms of their possible use on the DC-8. These engines have high bypass ratios for low jet noise and low-speed, low-noise fans. Experiments were carried out on various fan designs with different tip speeds. The advantage of low tip speeds and high lift coefficients has been demonstrated. The engines are equipped with flight-standard nacelles with acoustic suppression. It is estimated that these improvements will reduce DC-8 noise by about 26EPNdB-29EPNdB.
    Keywords: PROPULSION SYSTEMS
    Type: Flight International; 106; July 25
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    SPACE RESEARCH PROGRAM (1963)
    In:  Other Sources
    Details
    Publication Date: 2011-08-10
    Description: Developments in research programs related to launch-vehicle technology and space-vehicle technology
    Keywords: AERODYNAMICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Electric power generation (1964)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Electric power generation for space vehicles - batteries, solar cells, thermoelectric converters, magnetohydrodynamic converters, fuel cells, and thermionic converters
    Keywords: CHEMISTRY
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    A Quiet Engine for stilling complaints. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Two experimental Quiet Engines using derated CF6 cores are discussed. One engine has a low-speed fan running at a tip speed of 1160 fps; the other engine has a fan running at the high speed of 1550 fps. The two engines are expected to show the relative advantages of fans operating at low tip speeds with high lift coefficients in comparison with fans operating at high tip speeds with low lift coefficients. Test results obtained with full-scale (6-ft diameter) fans are examined.
    Keywords: PROPULSION SYSTEMS
    Type: Astronautics and Aeronautics; 11; Jan. 197
    Format: text
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    NASA TECHNICAL REPORTS
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