A Data Analysis System for Unsteady Turbulence Measurements

Abstract

A data analysis system has been developed to analyze unsteady turbulence measurements obtained in the boundary layer of an airfoil subjected to periodic turbulent pulse disturbances such as a propeller slipstream. Specific algorithms for analyzing the non-stationary data are identified, developed and implemented. Where alternate algorithms are developed, each is evaluated and the best method is recommended based on specific criteria. The statistical parameters used to characterize the unsteady turbulent boundary layer include the non-stationary mean velocity, turbulence intensity, power spectral density and the autocorrelation and cross correlation functions. Since the data is periodic, both ensemble averaging and special non-stationary empirical model techniques are employed. Each of the algorithms has been implemented in the FORTRAN language and examples are presented using representative test case data.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1988
Accession Number
ADA201662

Entities

People

  • Donald K. Johnson

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Computer Programming
  • Computer Programs
  • Computers
  • Cross Correlation
  • Data Analysis
  • Data Science
  • Fluid Dynamics
  • Fluid Flow
  • Information Science
  • Measurement
  • Operating Systems
  • Random Variables
  • Statistical Analysis
  • Turbulent Flow

Fields of Study

  • Physics

Readers

  • Computer Science.
  • Fluid Mechanics and Fluid Dynamics.
  • Radar Systems Engineering.