Turbulent Spot Generation and Growth Rates in a Compressible Boundary Layer.

Abstract

Experimental tests were conducted to examine the behavior of naturally occurring turbulent spots over a wide range of gas-turbine representative conditions including: subsonic and supersonic flow, acceleration parameters, and freestream turbulence intensities. Turbulent spot propagation velocities, spreading angles, generation rates, and overhang profiles were determined using high-frequency data acquisition equipment in combination with high-density thin-film technology and hot wire anemometry. A new theory for the influence of the turbulent spot disturbance on a laminar boundary layer has been developed and supported with experimental and computational data. Modelling of the transition zone intermittency using spot characteristics was conducted using a new Dynamic Spot Model.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1995
Accession Number
ADA304396

Entities

People

  • John E. Lagraff
  • Terry V. Jones

Organizations

  • Syracuse University

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Air Force
  • Boundaries
  • Boundary Layer
  • Boundary Layer Flow
  • Boundary Layer Transition
  • Computational Fluid Dynamics
  • Data Acquisition
  • Flow
  • Fluid Dynamics
  • Fluid Flow
  • Gas Turbines
  • Heat Transfer
  • Hot Wire
  • Laminar Boundary Layer
  • Layers
  • Thin Films
  • Turbines

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Boundary Layers
  • Hypersonics - Hypersonic Flow