Separation-Bubble Velocity Measurements Using an Oscillating-Hot-Wire System.

Abstract

A system is developed to allow measurement of both the mean and disturbance flow velocities in separated regions. An oscillating-arm assembly provides a directional bias to the hot-wire probe, along with a linear-step assembly, which steps the probe through the boundary layer. This system is used to investigate the flow field associated with laminar separation bubbles. A series of velocity profiles are measured on an FX63-137 airfoil in the chord- Reynolds-number range: 150,000 < or = R sub c < or = 300,000, at angles of attack of alpha = 12 deg and alpha = 14 deg. Data are presented on the size of the separation bubble and on the location of transition to turbulence.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1991
Accession Number
ADA237997

Entities

People

  • William S. Saric

Organizations

  • Arizona State University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Boundary Layer
  • Boundary Layer Flow
  • Flow
  • Flow Fields
  • Flow Visualization
  • Free Stream
  • Hot Wire
  • Laminar Boundary Layer
  • Layers
  • Measurement
  • Pressure Gradients
  • Reynolds Number
  • Stratified Fluids
  • Turbulence
  • Turbulent Mixing
  • Two Dimensional
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Control Systems Engineering.
  • Fluid Mechanics and Fluid Dynamics.