Accession Number:

ADA273740

Title:

Direct Measurement of Turbulent Dissipation Rate Using Dual Laser Doppler Velocimeters

Descriptive Note:

Interim rept. Jun-Dec 92,

Corporate Author:

WRIGHT LAB WRIGHT-PATTERSON AFB OH

Report Date:

1993-01-01

Pagination or Media Count:

19.0

Abstract:

The analysis of two-point velocity correlation measurement, made in the anisotropic flowfield of axisymmetric sudden expansion using two-single component LDV systems, has been performed. Estimations of the Taylor microscale were made and the one-dimensional energy spectrum was determined using the spatial and auto-correlation functions from these measurements. Difficulties in estimating the Taylor microscale from spatial and auto-correlations are discussed and methods to overcome these difficulties are suggested. Calculations of the one dimensional energy spectrum from curve fits to the correlation functions are explored and some hazards of the process are highlighted.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE