Turbulent Drag Reduction Using Compliant Coatings

Abstract

The skin-friction drag of compliant coatings was measured using an axi-symmetric test model in a water tunnel for flow speed up to 4.5 m/s at the Reynolds number of 2.3 million. There were measurable drag reductions for up to 3% from three out of five compliant coatings tested. Only one coating showed a small drag increase, and the other had no change in drag. For all the tests, the 95% confidence level in measured drag reduction was 1% for flow velocities between 2.5 and 4.5 m/s. The error analysis suggested that the uncertainty was progressively increased with a reduction in flow velocity.

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Document Details

Document Type
Technical Report
Publication Date
Aug 19, 2004
Accession Number
ADA426554

Entities

People

  • Kwing-so Choi

Organizations

  • University of Nottingham

Tags

DTIC Thesaurus Topics

  • Boundaries
  • Boundary Layer
  • Drag
  • Drag Reduction
  • Elastic Properties
  • Error Analysis
  • Frequency
  • Friction
  • Layers
  • Manufacturing Engineering
  • Materials
  • Measurement
  • Modulus Of Elasticity
  • Skin Friction
  • Test Facilities
  • Turbulent Boundary Layer
  • Water Tunnels

Fields of Study

  • Physics

Readers

  • Defense Acquisition Program Management
  • Fluid Dynamics.
  • Materials Science and Engineering.