Control of Embedded Vortices Using Wall Jets

Abstract

A wall jet inclined at 30 to horizontal was used to alter the structural characteristics of streamwise vortices embedded in a turbulent boundary layer developing in a zero pressure gradient. The vortices were created using a half delta wing attached to the floor of a wind tunnel. With the jet opposing the vortex downwash and blowing ration increasing from 0 to 4.8, streamwise vorticity decreased from approx 750 to approx 150/s while circulation decreased from approx. 0.15 sq. m/s. The average vortex core radius increased from approx. 0.9 to approx. 2.4 cm, while the vortex moved approx. 3 cm spanwise toward the jet. With the jet at the vortex upwash and blowing ratio increasing from 0 to 6.7, streamwise vorticity decreased from approx 860 to approx 570/s while circulation decreased from approx. 0.17 to approx. 0.15 sq. m/s. Embedded vortex, Vortex control, Theses.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1988
Accession Number
ADA202606

Entities

People

  • Geoffrey E. Schwartz

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acquisition
  • Boundary Layer
  • Computational Fluid Dynamics
  • Data Acquisition
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Gas Turbines
  • Heat Transfer
  • Measurement
  • Mechanical Engineering
  • Mechanics
  • Secondary Flow
  • Turbine Blades
  • Turbulent Boundary Layer
  • Vortex Generators
  • Wind Tunnels

Fields of Study

  • Computer science
  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Mathematics or Statistics