Forced Three Dimensional Flow Structures.

Abstract

Forced unsteadiness in a two-dimensional jet using fluidically imposed excitation in the jet nozzle has been studied experimentally. A second method of introducing unsteadiness using a rotating cam-shaped rotor has also been studied in the jet flow as well as in flows over rearward facing ramps and backsteps. Results show that the separation and reattachment conditions can be controlled in this manner and that jet and wake spreading characteristics can be modified using these techniques. Two techniques for identification of rotational vortex structures have been developed. Their first uses phase information in the discrete Fourier transform of the field while the second involves spatial behavior of local orthogonal decomposition components. Keywords: Unsteady flow; Separated flow; Vortex.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1985
Accession Number
ADA179652

Entities

People

  • Herman Viets

Organizations

  • West Virginia University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Boundary Layer
  • Boundary Layer Control
  • Data Acquisition
  • Discrete Fourier Transforms
  • Drag Reduction
  • Filtration
  • Flow
  • Flow Fields
  • Flow Visualization
  • Frequency Response
  • Hot Wire
  • Steady Flow
  • Three Dimensional
  • Three Dimensional Flow
  • Time Domain
  • Unsteady Flow
  • West Virginia

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Image Processing and Computer Vision.