Accession Number:

ADA196887

Title:

A Study of Turbulence Production Using a New Photochromic Visualization Technique

Descriptive Note:

Annual rept. 1 Oct 1986-1 Oct 1987

Corporate Author:

MICHIGAN STATE UNIV EAST LANSING TURBULENCE STRUCTURE LAB

Personal Author(s):

Report Date:

1988-04-28

Pagination or Media Count:

158.0

Abstract:

The new technique of Laser Induced Photochemical Anemometry LIPA has been developed to enable measurement of the evolution of coherent structures involved in the turbulent production process. Results are reported showing the measurement of the streamwise and transverse vorticity component and the strain rate as well as the Reynolds stresses at large numbers of points in a chosen plane. Calibration depends only on a time and a length scale. Comparison of measurements with the exact solution in a Stokes layer indicates that the techniques accuracy can be predicted by classical error analysis and that it is comparable or better than that achievable with the best single point probe techniques. The results show the relative importance of streaks, pockets and hairpins that are generated in the vortex ringwall simulation of the turbulence production process. Keywords Turbulence Boundary layer Flow visualization.

Subject Categories:

  • Radiation and Nuclear Chemistry
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE