Accession Number:

AD0677367

Title:

ON THE DISTRIBUTION AND DEVELOPMENT OF MEAN-FLOW AND TURBULENCE CHARACTERISTICS IN JET AND WAKE FLOWS.

Descriptive Note:

Technical rept.,

Corporate Author:

IOWA UNIV IOWA CITY IOWA INST OF HYDRAULIC RESEARCH

Personal Author(s):

Report Date:

1968-08-01

Pagination or Media Count:

40.0

Abstract:

The lateral distributions of various mean-flow and turbulence characteristics, as obtained from measurements in axisymmetric jets and wakes, are shown to conform to a new concept of self-preservation. The development downstream from the flow origin of representative cross-sectional values of the turbulence shear stress, turbulence normal stress, and the maximum mean-velocity difference, as well as the development of some nondimensional ratios thereof, is presented for the following free-turbulence flows plane free jets and wall jets with ambient streams, axisymmetric jets in coaxial streams with different ratios of jet to free-stream velocity, and wakes behind a slender spheroid, a disk, a square plate, and a self-propelled body of revolution. The results indicate that in the case of axisymmetric free-shear flows, similarity according to the conventional definition is not even approached asymptotically and that the conditions of flow generation have a greater influence on the downstream flow development than has been assumed previously. Author

Subject Categories:

  • Aerodynamics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE