2. Study on Cavitation Erosion

概要

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In this paper, authors conducted experimental investigations on cavitation damage to specimens of pure aluminum placed in a venturi type cavitation tunnel. The main object of experiments is to confirm the relation between damage intensity and flow velocity. Conclusions obtained are as follows; (1) Cavitation damage intensity is largely affected by flow velocity, for instance, the number of erosion pits varies with the 5th to 6th power of flow velocity. (2) Erosion pits are generated near the end of fixed-cavity. (3) Distribution of erosion pits are supposed to be caused by difference of initial radius of a collapsing bubble and oscillatory variation of length of fixed-cavity. Simplified equation of bubble radius is solved numerically. From the calculation of pressure field around a collapsing bubble, following results are obtained; (4) Maximum pressure on bubble wall varies with the 11th power of flow velocity. (5) Maximum velocity of bubble wall varies with the 5th power of flow velocity. (6) On the assumption that damage intensity increases in proportion to impulse provided to the surface of specimens, these calculations show good agreement with experimental results.
社団法人日本船舶海洋工学会の論文
1974-11-00