TURBULENT FRONT STRUCTURE OF AN AXISYMMETRIC COMPRESSIBLE WAKE

Abstract

Intermittency measurements have been performed within the first one hundred virtual diameters of an axi-symmetric compressible wake. The primary measurements, performed with the hot-wire anemometer, concerned the intermittency factor and the frequency of zero occurrences. The intermittent flow covered most of the wake profile but for a narrow region about the axis, and was found to be normally distributed around the average front position. The latter, along with the extent of the front standard deviation, was found to agree numerically with expectations based on low speed wakes and to grow as the 1/3-power of axial distance. A weak periodicity of the front was detected at a wavelength about nine times greater than the longitudinal scale of turbulent velocity fluctuations. This periodicity affects the turbulent spectra.

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Document Details

Document Type
Technical Report
Publication Date
Nov 15, 1967
Accession Number
AD0842013

Entities

People

  • A. Demetriades

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Autocorrelation
  • Axisymmetric
  • Boundary Layer
  • Coefficients
  • Computer Programs
  • Computers
  • Curve Fitting
  • Flow
  • Fluid Mechanics
  • Hot Wire
  • Hot Wire Anemometers
  • Probability
  • Random Variables
  • Reynolds Number
  • Statistical Analysis
  • Turbulent Flow
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Fluid Mechanics and Fluid Dynamics.
  • Mathematics or Statistics