RADIATION FROM AND PANEL RESPONSE TO A SUPERSONIC TURBULENT BOUNDARY LAYER

Abstract

When the convection velocity of the turbulence exceeds the local speed of sound in the medium the coupling of the panel modes to the acoustic field becomes very strong. The structural damping which is usually constant for all modes is overshadowed by the acoustic damping which increases with frequency. For a boundary layer of nearly zero pressure gradient the linear theory is still useful in predicting the panel response and compares well with experiment. Using Kirchhoff's theorem the acoustic power radiated from a turbulent boundary layer was expressed in terms of the cross spectral density of the pressure field over a rigid plane surface. Computation shows that by using this method the acoustic power level agrees satisfactorily with the measurement.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1968
Accession Number
AD0677882

Entities

People

  • L. Maestrello

Organizations

  • Boeing

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aerodynamic Noise
  • Aircrafts
  • Boundary Layer
  • Convection
  • Doppler Effect
  • Finite Element Analysis
  • Flow Fields
  • Fluid Dynamics
  • Jet Propulsion
  • Mach Number
  • Measurement
  • Power Spectra
  • Pressure Gradients
  • Static Pressure
  • Turbulent Flow
  • Two Dimensional
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Structural Health Monitoring of Composite Structures.
  • Wave Propagation and Nonlinear Chaotic Dynamics.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Boundary Layers