JET NOISE SOURCE MODIFICATION DUE TO FORWARD FLIGHT

The effects of forward flight on the turbulence characteristics of a jet in a coflowing stream have been determined for a 2.22 in. circular jet in a 36 in. free jet wind tunnel. The nozzle exit velocity was 400 fps and the tunnel velocity was set at 0, 40, 120, and 200 fps. Measurements of flow properties including mean velocity, turbulence intensity and spectra, convection velocity, integral length scale, and convected frame integral time scale were carried out using two linearized hot wires. Results were used to predict changes due to flight in the jet acoustic sources. The noise reductions for a cold jet with a velocity of 1000 fps, due to the change in acoustic sources in flight, agreed well at all angles with measured noise reductions.

  • Corporate Authors:

    American Institute of Aeronautics and Astronautics

    1290 Avenue of the Americas
    New York, NY  United States  10019
  • Authors:
    • Larson, R S
    • McColgan, C J
    • Packman, A B
  • Publication Date: 1978-3

Media Info

  • Features: References;
  • Pagination: p. 225-232
  • Serial:
    • AIAA Journal
    • Volume: 16
    • Issue Number: 3
    • Publisher: American Institute of Aeronautics and Astronautics

Subject/Index Terms

Filing Info

  • Accession Number: 00178457
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Aug 19 1978 12:00AM