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  • Aircraft Propulsion and Power  (1)
  • Fluid Mechanics and Thermodynamics; Aircraft Design, Testing and Performance  (1)
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  • 1
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    Nox Emission Reduction in Commercial Jets Through Water Injection (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper discusses a method of the nitrogen oxides (NOx) emission reduction through the injection of water in commercial turbofan engines during the takeoff and climbout cycles. In addition to emission reduction, this method can significantly reduce turbine temperature during the most demanding operational modes (takeoff and climbout) and increase engine reliability and life.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2002-211978 , NAS 1.15:211978 , E-13647 , AIAA Paper 2002-3623 , 38th Joint Propulsion Conference and Exhibit; Jul 07, 2002 - Jul 10, 2002; Indianapolis, IN; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Application of Pinniped Vibrissae to Aeropropulsion (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Vibrissae of Phoca Vitulina (Harbor Seal) and Mirounga Angustirostris (Elephant Seal) possess undulations along their length. Harbor Seal Vibrissae were shown to reduce vortex induced vibrations and reduce drag compared to appropriately scaled cylinders and ellipses. Samples of Harbor Seal vibrissae, Elephant Seal vibrissae and California Sea Lion vibrissae were collected from the Marine Mammal Center in California. CT scanning, microscopy and 3D scanning techniques were utilized to characterize the whiskers. Computational fluid dynamics simulations of the whiskers were carried out to compare them to an ellipse and a cylinder. Leading edge parameters from the whiskers were used to create a 3D profile based on a modern power turbine blade. The NASA SW-2 facility was used to perform wind tunnel cascade testing on the 'Seal Blades'. Computational Fluid Dynamics simulations were used to study incidence angles from -37 to +10 degrees on the aerodynamic performance of the Seal Blade. The tests and simulations were conducted at a Reynolds number of 100,000. The Seal Blades showed consistent performance improvements over the baseline configuration. It was determined that a fuel burn reduction of approximately 5 could be achieved for a fixed wing aircraft. Noise reduction potential is also explored.
    Keywords: Fluid Mechanics and Thermodynamics; Aircraft Design, Testing and Performance
    Type: GRC-E-DAA-TN24354 , ASME Turbo Expo 2015; Jun 15, 2015 - Jun 19, 2015; Montreal; Canada
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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