EXPERIMENTAL NOISE INVESTIGATION OF MODEL NOZZLES

Abstract

Far field sound pressure levels were measured in an anechoic room for noise generated by cold air flow through a wide variety of small nozzle configurations. These nozzles included converging, converging-diverging, annular plug, annular center core flow, and ejector types. The results are examined in terms of mass flow and acoustic power performance. Thrust determinations were made for selected nozzles showing good acoustic performance, permitting an ultimate evaluation of their acoustic performance in terms of their thrust performance. Optimized nozzles from each of four nozzle configurations are recommended for a full-scale evaluation. These are a plug, a center core flow, a converging-diverging, and a converging-diverging plug nozzle. The noise generated by hot air flow through a converging nozzle was determined, enabling only partial corroboration of the scaling technique developed in a previous study. One of the recommended nozzle types, the plug nozzle, was investigated under hot flow conditions and its acoustic performance was found to remain superior to that of a converging nozzle.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1964
Accession Number
AD0610256

Entities

People

  • David F. Pernet

Organizations

  • IIT Research Institute

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Air Flow
  • Air Force
  • Air Supplies
  • Flow Rate
  • Fluid Dynamics
  • Gas Flow
  • Gas Turbine Nozzles
  • Gas Turbines
  • Hydrodynamics
  • Jet Engines
  • Jet Flow
  • Plastic Explosives
  • Power Levels
  • Pressure Measurement
  • Sound Pressure
  • Stagnation Temperature
  • Strouhal Number

Readers

  • Acoustics.
  • Combustion and Flow Dynamics.