Calculations of Turbulent Boundary Layer (TBL) Pressure Fluctuations Transmitted into a Viscoelastic Layer

Abstract

The objective of this paper is to develop a model for calculating the turbulent boundary layer pressure fluctuation transmitted into a layer of viscoelastic material. The theoretical model used here is a plane elastomer layer backed by a rigid plane surface. The other side of the plane surface is exposed to a turbulent flow. The transmitted flow noise received by a rectangular hydrophone embedded in the elastomer layer was calculated for various turbulent boundary layer forcing functions developed by Corcos, and by Chase. The transmitted flow noise was characterized by the frequency spectral density expressed in decibels. Wave-vector spectral densities of various turbulent wall pressures were discussed. Effects of the elastomer layer thickness, material properties and flow conditions on the transmitted noise level are presented.

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Document Details

Document Type
Technical Report
Publication Date
Jun 21, 1985
Accession Number
ADA630597

Entities

People

  • Howard H. Schloemer
  • Sung H. Ko

Organizations

  • Naval Underwater Systems Center

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Boundaries
  • Boundary Layer
  • Elastomers
  • Flow
  • Flow Noise
  • Fluid Flow
  • Free Stream
  • Frequency
  • Hydrophones
  • Materials
  • Modulus Of Elasticity
  • Natural Rubber
  • Noise
  • Noise Reduction
  • Power Spectra
  • Turbulent Boundary Layer
  • Turbulent Flow

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Fluid Mechanics and Fluid Dynamics.
  • Polymer Science and Technology