Accession Number:

ADA017947

Title:

Theory of Ventilating or Cavitating Flows about Symmetric Surface-Piercing Struts,

Descriptive Note:

Corporate Author:

DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD

Personal Author(s):

• Yim,B.

Report Date:

1975-09-01

Pagination or Media Count:

45.0

Abstract:

Two stable states of high-speed strut flow are considered in three dimensions under linear boundary conditions. The strut is thin, symmetric, without angle of attack, and has base-ventilation 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 least-squares 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