
Accession Number : ADA017947
Title : Theory of Ventilating or Cavitating Flows about Symmetric SurfacePiercing Struts,
Corporate Author : DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD
Personal Author(s) : Yim,B.
Report Date : SEP 1975
Pagination or Media Count : 45
Abstract : Two stable states of highspeed strut flow are considered in three dimensions under linear boundary conditions. The strut is thin, symmetric, without angle of attack, and has baseventilation or base cavitation without side cavitation. The strut and cavity are represented by polynomial source distributions with unknown coefficients on the center plane. Coefficients of the polynomial for the cavity are obtained as solutions for integral equations of cavity source, using a leastsquares method. All the singular double integrals in the present problem are integrated in closed forms by using recurrence formulas. Thus, common errors due to numerical integration of the singular integrals are avoided. Approximate cavity shape and cavity drag are obtained. Downwash is calculated at the hydrofoil plane, which is assumed to be located at the tip of and perpendicular to the strut.
Descriptors : *Cavitation, *Struts, *Fluid dynamics, Mathematical models, Theory, Surface properties, High velocity, Problem solving, Integral equations, Least squares method, Hydrofoils, Downwash, Shape
Subject Categories : Marine Engineering
Fluid Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE