Accession Number:

AD0619661

Title:

FLUTTER ANALYSIS OF A HYDROFOIL NEAR A FREE SURFACE

Descriptive Note:

Final technical rept. for Oct 1962-Jan 1965

Corporate Author:

CORNELL AERONAUTICAL LAB INC BUFFALO NY

Personal Author(s):

Report Date:

1965-08-01

Pagination or Media Count:

40.0

Abstract:

The flutter characteristics of a two-dimensional hydrofoil near a free surface are analyzed, with consideration given to the cases of both one and two degrees of freedom. The flutter equations incorporate lift and moment as determined from an exact linearized potential solution. Free-surface effects are included without approximation. Results indicate that for the system having two degrees of freedom, the free surface has very little effect on flutter boundaries, despite the large changes in hydrodynamic loading caused by foil- induced surface waves. When the hydrofoil was constrained to move only in pitch, however, flutter solutions were found where none exist in the absence of the free surface, for practical values of mass ratio and pitch-axis position.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE