Leading Edge Flutter of Supercavitating Hydrofoils.
CALIFORNIA INST OF TECH PASADENA
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This document represents the results of experiments and analysis of the phenomenon of leading edge flutter which has been observed to occur for supercavitating hydrofoils. The experiments confirmed the existence of such a single degree of freedom flutter involving chordwise bending and indicated that for long, natural or vapor-filled cavities the reduced flutter speed U sub Fomega sub FC was in the range 0.15 to 0.23. Secondary effects observed were the variation with the angle of attached a minimum flutter speed occurred at 10 deg and with a foil mass ratio. Shorter cavities typically yielded flower flutter speeds due to a complex interaction between the bubble collapse process occurring in the cavity closure region and the unsteady hydrodynamic load on the foil. Finally a relatively simple theoretical analysis for supercavitating hydrofoils with elastic axes aft of mid-chord is presented. This linear analysis yields reduced flutter velocities somewhat lower than those observed. Author
- Marine Engineering
- Fluid Mechanics