Accession Number:

ADA000262

Title:

Effect of Drag-Reducing Polymer Injection on the Lift and Drag of a Two- Dimensional Hydrofoil

Descriptive Note:

Technical rept.

Corporate Author:

HYDRONAUTICS INC LAUREL MD

Personal Author(s):

• Fruman, D. H.
• Sundaram, T. R.
• Daugard, S. J.

Report Date:

1974-09-01

Pagination or Media Count:

37.0

Abstract:

The present paper describes an experimental investigation on the effects of injecting drag-reducing polymer solutions into the turbulent boundary layer of two NACA 63, two-dimensional, symmetrical, hydrofoils. The experiments were performed in a high-speed circulating channel with free stream velocities of up to 13 msec. The two foils used were 10 and 20 cm in chord, though both had a maximum thickness of 2 cm. The incidence of the foils varied between plus or minus 5 degrees with the ratios of the injection to free stream velocity of up to 0.2, and a concentration of polyethylene oxide, POLYOX WSR 301, of 200 ppm. The injection slits on both foils are situated one-tenth of a chord downstream of the leading edge. The gap of the injection slit was 0.0127 cm for the small foil and twice this value for the larger foil. Modified author abstract

Descriptors:

• *POLYMERS
• *DRAG REDUCTION
• *HYDROFOILS
• INJECTION
• SOLUTIONS(MIXTURES)
• ADDITIVES
• LEADING EDGES
• LIFT TO DRAG RATIO
• HYDROFOIL CRAFT

Subject Categories:

• Marine Engineering
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE