Accession Number:

AD0785352

Title:

Application of a Dual Beam Laser Velocimeter to Turbulent Flow Measurements

Descriptive Note:

Final rept. 1 Jul 1972-30 Jun 1973

Corporate Author:

ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN

Personal Author(s):

Report Date:

1974-09-01

Pagination or Media Count:

44.0

Abstract:

A dual beam laser velocimeter LV system has been applied to the measurements of mean velocity and turbulence intensity. The basic theory of the LV is described in terms of both Doppler and fringe models. A statistical analysis predicting the number of data points required to ensure a given accuracy is developed. Experimental verification of the analysis is given. A theoretical analysis of the LV counting process is proposed which predicts the biases to be found in velocity and turbulent intensity estimators. The two most common methods of averaging are compared for biases in the estimators for a one- dimensional model. Finally, experimental LV data are presented, taken from a coaxial free-jet-mixing facility.

Subject Categories:

  • Lasers and Masers
  • Test Facilities, Equipment and Methods
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE