FLOW NOISE AND DRAG MEASUREMENTS OF VEHICLE WITH COMPLIANT COATING

Abstract

The forward portion of a buoyancy-propelled test vehicle was coated with 'Lamiflo,' a liquidfilled compliant rubber skin intended to reduce drag. Self-noise and drag measurements were compared with those of the bare vehicle. The coating increased the drag slightly and shifted the transition forward, possibly because of a surface irregularity. Self-noise in the 31.4-kc band was decreased with a filling liquid having a viscosity of 2,000 centipoise but was not decreased with water filling. Turbulent boundarylayer pressure fluctuation levels (measured under the skin) were generally lower than those of the bare body, and the lower frequencies were attenuated more with the high-viscosity liquid than with water.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1964
Accession Number
AD0444376

Entities

People

  • C. R. Nisewanger

Organizations

  • Naval Air Weapons Station China Lake

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundaries
  • Boundary Layer
  • Buoyancy
  • Flow Noise
  • Frequency
  • Jet Propulsion
  • Laminar Flow
  • Layers
  • Measurement
  • Munitions
  • Pressure Distribution
  • Recording Systems
  • Skin Friction
  • Test Vehicles
  • Transducers
  • Underwater Ordnance
  • Vehicles

Readers

  • Acoustics.
  • Electrical Engineering
  • Fluid Mechanics and Fluid Dynamics.