Measurements of Energy Losses Associated with Interactions Between Acoustic Waves and a Steady Flow Field.

Abstract

An experimental program has been conducted to study interactions between acoustic waves and non-uniform flow fields. Data have been taken in an impedance tube, modified to accommodate an average flow, and in a resonance tube. Results are given for the influence of flow through a subsonic exhaust vent on an acoustic field. Measurements for circular and slot vents of several sizes and for two frequencies show that the flow through the vent causes a transfer of energy from the average flow field to the acoustic field: The vent acts as a source or gain of acoustic energy. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Mar 15, 1978
Accession Number
ADA054532

Entities

People

  • F. E. C. Culick
  • K. Magiawala

Organizations

  • California Institute of Technology

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Acoustic Fields
  • Acoustic Waves
  • Acoustics
  • Combustion
  • Combustion Chambers
  • Flow Fields
  • Flow Rate
  • Frequency
  • Instrumentation
  • Jet Propulsion
  • Mach Number
  • Measurement
  • Resonant Frequency
  • Shape
  • Standards
  • Vibration

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Wave Propagation and Nonlinear Chaotic Dynamics.