Turbulent Drag Reduction Using Compliant Coatings
Final rept. 1 Jun 2002-30 Sep 2003
NOTTINGHAM UNIV (UNITED KINGDOM) SCHOOL OF MECHANICAL MATERIALS MANUFACTURING ENGINEERING AND MANAGEME
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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 ms 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 ms. The error analysis suggested that the uncertainty was progressively increased with a reduction in flow velocity.
- Fluid Mechanics