Hydroelastic characteristics of flexible supercavitating hydrofoils. I - Two-dimensional theory at zero cavitation number when clamped at trailing edge. II - Two-dimensional theory at zero cavitation number when supported elastically
Abstract
A linearized theory for analyzing the deformation of a chordwise flexible supercavitation foil when clamped at the trailing edge at zero cavitation number is developed. Expressions are presented for the chordwise deformation and stress distribution along the foil, the pressure distribution on the foil, and the steady and unsteady forces acting on the foil. Using these expressions, the chordwise bending flutter, chordwise bending divergence, strength near the leading edge, and cavitation inception on the pressure side are investigated numerically. It is found that the critical speed of the chordwise bending stress increases linearly with an increase in the thickness-cord ratio. The critical speed of cavitation inception on the pressure side is lower than the critical speed of chordwise bending divergence. The critical value of chordwise bending flutter increases with an increase in the density ratio. A slight thickness near the leading edge is effective in increasing the critical speed of chordwise bending flutter and cavitation inception on the pressure side, or decreasing the stress due to chordwise bending.
- Publication:
-
JSME International Journal Series B
- Pub Date:
- August 1981
- Bibcode:
- 1981JSMEB..24.1379M
- Keywords:
-
- Computational Fluid Dynamics;
- Hydroelasticity;
- Hydrofoils;
- Supercavitating Flow;
- Trailing-Edge Flaps;
- Two Dimensional Flow;
- Bending Vibration;
- Chords (Geometry);
- Hydrodynamics;
- Performance Prediction;
- Stress Analysis;
- Stress Distribution;
- Torsional Stress;
- Fluid Mechanics and Heat Transfer