Application of a Dual Beam Laser Velocimeter to Turbulent Flow Measurements

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.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1974
Accession Number
AD0785352

Entities

People

  • H. T. Bentley Iii
  • V. A. Cline

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Accuracy
  • Air Force
  • Boundary Layer
  • Data Analysis
  • Data Reduction
  • Data Science
  • Engineering
  • Experimental Data
  • Fluid Dynamics
  • Hot Wire
  • Information Science
  • Intensity
  • Laser Velocimeters
  • Measurement
  • Statistical Analysis
  • Statistical Samples
  • Test Facilities

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Fluid Dynamics.
  • Statistical inference.

Technology Areas

  • Directed Energy