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  • 1
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    Noise from underexpanded axisymmetric jet flows using radial jet flow impingement (1969)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Acoustic radiation from underexpanded supersonic main jet flow from nozzle impinged upon by annular jet
    Keywords: FLUID MECHANICS
    Type: AERODYNAMIC NOISE, SYMPOSIUM, U. OF TORONTO; May 20, 1968 - May 21, 1968; TORONTO; CANADA
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Acoustic wave propagation in an axisymmetric swirling jet. (1973)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: An analysis has been developed to study the acoustic wave propagation in an axisymmetric swirling subsonic jet flow. The governing convected wave equation derived in the spherical coordinates includes mean shears, shear gradients and pressure gradients. The directivity patterns for various spinning and non-spinning modes due to the influence of the mean jet swirl were obtained by numerically integrating the governing wave equation. The mean flow field used in the computation was that obtained semiempirically for subsonic swirling turbulent jet and is completely specified once the degree of swirl is known. The dependence of sound directivity on jet Mach number, swirl ratio and frequency are discussed.
    Keywords: FLUID MECHANICS
    Type: AIAA PAPER 73-1004 , Aero-Acoustics Conference; Oct 15, 1973 - Oct 17, 1973; Seattle, WA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Noise field of coaxial interacting supersonic jet flows (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Near and far noise fields from coaxial interacting supersonic jet flows
    Keywords: FLUID MECHANICS
    Type: AIAA PAPER 71-152 , AEROSPACE SCIENCES MEETING; Jan 25, 1971 - Jan 27, 1971; NEW YORK, NY
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Far noise field of a two-dimensional subsonic jet (1974)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The acoustical radiation characteristics of a high aspect ratio, cold subsonic, model slot jet have been investigated experimentally. Acoustical measurements were made in both a free-field environment and a reverberation field environment. Mean velocity distribution of the slot jet was determined to provide information on the mixing characteristics of the flow. Free-field results obtained reflected a characteristic asymmetrical directivity pattern of the slot jet noise. The total radiated sound power yielded a typical U to the 7-th power dependence on mean jet velocity. The experimental findings are compared with data from similar studies and also with radiation characteristics of circular cold subsonic jets.
    Keywords: FLUID MECHANICS
    Type: AIAA PAPER 74-44 , Aerospace Sciences Meeting; Jan 30, 1974 - Feb 01, 1974; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Reduction of noise from supersonic jet flows (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Interacting coaxial supersonic jet flows noise reduction based on noise distribution characteristics measurement in anechoic chamber
    Keywords: FLUID MECHANICS
    Type: AIAA PAPER 70-236 , AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, AEROSPACE SCIENCES MEETING, 8TH; Jan 19, 1970 - Jan 21, 1970; NEW YORK, NY
    Format: text
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    NASA TECHNICAL REPORTS
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