Hydroelastic Characteristics of Flexible Supercavitating Hydrofoils Report 1. Two-dimensional Theory at Zero Cavitation Number when Clamped at Trailing Edge

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Since a typical supercavitating hydrofoil has a sharp leading edge, its chordwise bending deformation and oscillation become a serious problem. Expressions are presented for the pressure distribution, lift and drag of a thin hydrofoil performing chordwise bending oscillation when clampted at the trailing edge at zero cavitation number. By using these expressions, chordwise bending flutter, chordwise bending divergence, strength near the leading edge and cavitation inception on the pressure side are investigated numerically. From the results have been deduced the following ; (1) The critical speed of cavitation inception on the pressure side is lower than the critical speed of chordwise bending divergence. (2) To give a slight thickness near the leading edge is very effective for increasing the critical speed of chordwise bending flutter and cavitation inception on the pressure side or decreasing the stress due to chordwise bending.
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