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  • AIRCRAFT  (1)
  • PROPELLANTS AND FUELS
  • 1970-1974  (1)
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  • AIRCRAFT  (1)
  • PROPELLANTS AND FUELS
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    The influence of a crossflow on jet noise (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The acoustic field generated by a circular jet in the presence of a low speed crossflow is calculated. The solution is obtained for a quadrupole source located in a uniformly moving acoustic medium. Ribner's work on straight jets is used to model the flow in the turbulent crossflow jet. The movement of the acoustic medium results in the acoustic intensity being greater upstream of the jet flow than at an equal distance downstream. A summary is also presented of the analysis for the acoustic intensity of a crossflow jet which is in motion through a stationary acoustic medium. The analysis is applicable to the noise generated by the lift jet of a V/STOL aircraft under take-off or landing conditions. The results of these two configurations provide a comparision of the directional distribution of acoustic intensity measured in a wind tunnel test of a crossflow jet and in a corresponding flight test.
    Keywords: AIRCRAFT
    Type: NASA-CR-2169
    Format: application/pdf
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