Unsteady Turbulent Boundary Layers in Adverse Pressure Gradients

Abstract

A number of characteristics of an unsteady turbulent boundary layer have been measured on the after part of the upper surface of an 0012 airfoil (X/ c = 0.69 and 0.94). The data is taken at chord Reynolds number of 700,000 and over a range of reduced frequencies (based upon the semichord) of 0.5 to 6.4. Mean and unsteady velocity profiles, as well as Reynolds stress profiles, are presented, as is the nonlinear coupling from the unsteady motion into the steady motion. Data is presented and discussed which shows that for this experiment the periodic unsteady turbulent velocity profile tends toward a universal shape.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1982
Accession Number
ADA121691

Entities

People

  • Eugene E. Covert
  • Peter F. Lorber

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Materials and Manufacturing Processes
  • Sensors

DTIC Thesaurus Topics

  • Abstracts
  • Aeronautics
  • Astronautics
  • Boundary Layer
  • Computational Fluid Dynamics
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Heat Transfer
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Pressure Distribution
  • Pressure Gradients
  • Reynolds Number
  • Turbulent Boundary Layer
  • Unsteady Flow

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Ocean-Atmosphere Mesoscale Modeling, Data Assimilation, and Flux Boundary Layers