Shock Wave and Boundary Layer Control for Aero-Optic Application

Abstract

As part of our work on APOSR Grant F-49620-00-1-0319, 'Shock Wave And Boundary Layer Control For Aero-Optic Applications', we have explored slot-injection of helium into Mach 8 boundary layers, over a range of Reynolds numbers. We injected helium into a fully turbulent boundary layer as well as transitional boundary layers. Downstream of the slot, we see a large-scale organization of the boundary layer (the appearance of longitudinal vortex-like structures that are very stable in spanwise location). We see this with very low helium mass flow rates (a few percent of the freestream value). Current work is directed toward understanding this phenomenon and detailed studies of the injection region using flow visualization and PIV are in progress to determine the formation of the streamwise vortices.

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Document Details

Document Type
Technical Report
Publication Date
Jul 24, 2002
Accession Number
ADA405454

Entities

People

  • A. J. Smits
  • Richard B. Miles

Organizations

  • Princeton University

Tags

Communities of Interest

  • Advanced Electronics
  • Sensors
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Boundaries
  • Boundary Layer
  • Boundary Layer Control
  • Flow
  • Flow Fields
  • Flow Rate
  • Flow Visualization
  • Fluid Dynamics
  • Layers
  • Mass Flow
  • Reynolds Number
  • Shock
  • Shock Waves
  • Three Dimensional
  • Turbulent Boundary Layer
  • Waves

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.