A Study of Turbulence Production Using a New Photochromic Visualization Technique

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 technique's 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 ring/wall simulation of the turbulence production process. Keywords: Turbulence; Boundary layer; Flow visualization.

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Document Details

Document Type
Technical Report
Publication Date
Apr 28, 1988
Accession Number
ADA196887

Entities

People

  • Chia‐Chi Chu
  • R. E. Falco

Organizations

  • Michigan State University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Boundary Layer Flow
  • Cameras
  • Computational Fluid Dynamics
  • Convection
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Hydrodynamics
  • Laser Beams
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Reynolds Number
  • Shear Stresses
  • Turbulent Flow
  • Turbulent Mixing

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Regression Analysis.

Technology Areas

  • Directed Energy