Ultra High Work, High Efficiency Turbines For UAVs

Abstract

The opportunity for the reattachment and control of separated flows occurs in inlets, compressors, transition ducts and turbines. Passive and active control of separated flows has been demonstrated successfully by a number of techniques which employ the introduction of longitudinal or streamwise vortices. The role of these vortices is initially to reenergize the wall boundary layer flow by entraining and redistributing momentum from the primary flow to the wall layer and enhance early transition. A chain of non-linear interactions of these unsteady vortices with large scale unsteady separation vortices and the shed shear layer results in significant alteration of the circulation. The resulting increased circulation allows higher blade loadings, reduced part count, and improved performance at low Reynolds numbers.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2006
Accession Number
ADA459406

Entities

People

  • Rolf Sondergaard

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Air Force Research Laboratories
  • Boundary Layer
  • Boundary Layer Flow
  • Computational Fluid Dynamics
  • Drag Reduction
  • Flow
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Glow Discharges
  • Hydrodynamics
  • Layers
  • Physics Laboratories
  • Reynolds Number
  • Turbines
  • Turbulent Mixing

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Fluid Mechanics and Fluid Dynamics.
  • Maritime Combat Support and Expeditionary Logistics.