Accession Number : AD0640187

Title :   MEASUREMENT OF CAVITY SHAPES ABOVE VENTILATED HYDROFOILS.

Descriptive Note : Technical rept.,

Corporate Author : HYDRONAUTICS INC LAUREL MD

Personal Author(s) : Altmann,R. J.

Report Date : NOV 1965

Pagination or Media Count : 44

Abstract : Recent test programs indicate that theoretical streamlines above a supercavitating hydrofoil may be considerably higher than those actually generated. To check theoretical predictions a three-dimensional traversing probe was constructed and used to map the upper cavity surfaces generated by two different two-dimensional hydrofoils. Experimental contours were found to fall below those predicted by theory at all angles of attack and depths of submergence tested. The rate of change of cavity ordinates with changes in angle of attack or depth of submergence is about the same as that predicted by theory. The contribution of angle of attack to cavity shape is responsible for the greater part of the difference between theoretical and measured cavity shapes. (Author)

Descriptors :   (*HYDROFOILS, *CAVITATION), MEASUREMENT, GEOMETRIC FORMS, ANGLE OF ATTACK, FLUID FLOW

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE