ANALYSIS OF PLUME RISE FROM JET AIRCRAFT

Preliminary results of an investigation of the behavior of buoyant jet engine exhaust plumes in a crosswind are discussed and attempts are made to identify the degree to which the plume rise can be described by relationships developed for other types of sources. At least four factors affect the rate of dilution of jet exhaust before it reaches receptors adjacent to taxiways or runways: (1) turbulent mixing of the jet exhaust at the engine exit; (2) buoyant plume rise; (3) advective dilution; and (4) dispersion by ambient turbulence. Observational studies of plumes generally allow only one or two separate processes to be measured, although the bending of an exhaust plume from its original release axis until it is aligned with the prevailing wind direction is also observable. This change in orientation may also be viewed as the transition from plume dilution dominated by the first mechanism to dilution controlled by the latter three. For this reason, the maximum length of the highly turbulent jet trail as a function of wind speed is of interest. Theoretical descriptions of plume bending and plume rise are discussed. Estimates of the maximum distances of dominance of jet exhaust mechanical turbulence are made for taxiing aircraft. The precision of measurement of the initiation time of each aircraft passage event was not adequate for analysis of differences between expected arrival times for CO at the first tower under alternate plume bending hypotheses. Thus, although these alternative descriptions of aircraft plume bending are given, the present comparisons with experimental evidence are restricted to the phenomenon of plume rise.

  • Supplemental Notes:
    • Symposium of Turbulence, Diffusion and Air Pollution, Boston, 15 January 1979.
  • Corporate Authors:

    Argonne National Laboratory

    9700 South Cass Avenue
    Argonne, IL  USA  60439

    Environmental Research & Technology, Incorporated

    429 Marrett Road
    Lexington, MA  USA  02173

    Department of Energy

    1000 Independence Avenue, SW
    Washington, DC  USA  20585
  • Authors:
    • Yamartino, R
    • Lee, Jong Jae
    • Bremer, S
    • Smith, D
    • Calman, J
  • Publication Date: 1979

Media Info

  • Pagination: 7 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00198435
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Contract Numbers: W-31-109-ENG-38
  • Files: TRIS
  • Created Date: Oct 17 1979 12:00AM