Unsteady Transonic Flows in a Two-Dimensional Diffuser.

Abstract

The second and third years of the contract comprise its second phase, aimed at exploring the effects of periodic, downstream excitation on the transonic flow in a two-dimensional diffuser model. The present report covers the second year of the contract. The pulse generator was incorporated in the diffuser model, and its controls were synchronized with the optical instrumentation. The boundary-layer control system was turned for best two-dimensionality of the flow. The flowfield instrumentation was selected, and an appropriate actuator was constructed. Perturbation of the flow by the actuator was determined to be acceptably small. Boundary-layer profiles were determined on all four walls, and the Mach number distribution was mapped in detail over the diffuser exit cross-section. Surface pressure distributions were measured, and spark schlieren photos were taken for the available pressure ratio range. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 31, 1979
Accession Number
ADA075261

Entities

People

  • J. C. Kroutil
  • M. Sajben

Tags

Communities of Interest

  • Sensors
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Actuators
  • Air Force
  • Air Force Facilities
  • Boundaries
  • Boundary Layer
  • Boundary Layer Control
  • Computational Fluid Dynamics
  • Engineers
  • Flow
  • Fluid Dynamics
  • Generators
  • Layers
  • Mechanical Engineering
  • Pressure Distribution
  • Pulse Generators
  • Two Dimensional
  • United States

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Fluid Mechanics and Fluid Dynamics.