Accession Number:

AD0779544

Title:

Skin Friction Drag Reduction by Compliant Coatings.

Descriptive Note:

Final rept. Sep 65-May 74,

Corporate Author:

OKLAHOMA UNIV NORMAN SCHOOL OF AEROSPACE MECHANICAL AND NUCLEAR ENGINEERING

Personal Author(s):

• Blick,Edward F.

Report Date:

1974-05-01

Pagination or Media Count:

29.0

Abstract:

Research on skin friction reduction by compliant coating conducted at the University of Oklahoma during the past eight years is reviewed. At the University of Oklahoma wind tunnel experiments showed that compliant coatings composed of a thin sheet of polyvinyl chloride covering either a thin layer of liquid or a thin layer of polyurethane foam reduced the turbulent skin friction drag by as much as 40 on flat plates. Hot wire anemometer measurements also indicated corresponding reductions in Reynolds stresses and turbulence intensities in the boundary layer. An NACA 0009 airfoil was found to have as much as 30 less drag when equipped with a polyvinyl chloride-polyurethane foam compliant coating. Author

Descriptors:

• *SKIN FRICTION
• *DRAG REDUCTION
• *PLASTIC COATINGS
• POLYVINYL CHLORIDE
• POLYURETHANE RESINS
• FOAM
• WIND TUNNELS
• TURBULENCE
• BOUNDARY LAYER FLOW

Subject Categories:

• Aerodynamics
• Coatings, Colorants and Finishes
• Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE