Accession Number : ADA956492

Title :   Additional Investigations of the Hydrodynamic Characteristics of a Hydrofoil Employing Polymer Ejection,

Corporate Author : OCEANICS INC PLAINVIEW NY

Personal Author(s) : Lehman, August F.

Report Date : SEP 1975

Pagination or Media Count : 95

Abstract : The results of this test program reaffirm the observations of an earlier test program in that, for this foil profile, ejection of either polymer or water from the leading edge can produce an increase or decrease in the lift and/or drag. Measurements made during this study show that the change in lift occurs because ejection alters the chordwise pressure distribution. The effect of polymer or water ejection on the local surface pressure is consistent, in the sense that if an effect occurs, polymer always reduces the local pressure whereas water always increases the local pressure. This holds whether ejection occurs on the suction or pressure side of the foil. This alteration of the pressure distribution accounts for the previously reported lift increases or decreases.

Descriptors :   *HYDROFOILS, *HYDRODYNAMIC CHARACTERISTICS, DRAG, EJECTION, LEADING EDGES, LIFT, POLYMERS, PRESSURE, PRESSURE DISTRIBUTION, SUCTION, TEST AND EVALUATION, WATER.

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE