Twin Jets Screech Suppression Concepts Tested for 4.7% Axisymmetric and Two-Dimensional Nozzle Configurations

Abstract

The sonic fatigue of nozzle flaps on F-15 and B-1 aircraft has demanded an increase in aeroacoustics research. A 4.7% scale, cold, static test was conducted at the Wright Research and Development Center (WRDC) to investigate noise suppression concepts on F-15 axisymmetric and two-dimensional nozzle configurations. These concepts included lateral spacing, secondary air jets, and tab suppression. Nozzle orientation parametrics included nozzle canting and pitch deflection. Design guideline charts are presented showing screech amplitude variation for each suppression and orientation concept. (emk)

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Document Details

Document Type
Technical Report
Publication Date
Sep 29, 1990
Accession Number
ADA229508

Entities

People

  • Steven H. Walker

Organizations

  • Wright Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acoustic Waves
  • Air Pressure
  • Aircrafts
  • Amplitude
  • Aspect Ratio
  • Axisymmetric
  • Data Reduction
  • Deflection
  • Frequency
  • Geometry
  • Instrumentation
  • Sonic Fatigue
  • Sound Pressure
  • Spreadsheet Software
  • Static Tests
  • Turbulent Mixing
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Combustion and Flow Dynamics.
  • Software Engineering

Technology Areas

  • Space
  • Space - Hall-Effect Thruster