Abstract

Aiming to study the complicated interference phenomenon of the cavitation flow around a multihydrofoil system with a finite number of foils, we establish a linear theoretical model under the conditions of small angle of attack and small cavitation number. By solving the model numerically, we analyze the effects of different cavitation numbers and foil spacings on cavitation flow. The cavitation shape and hydrodynamics of each foil in the multihydrofoil system are obtained. The shapes of the cavities differ from each other because of the mutual interference phenomenon. Moreover, the change rule for cavitation shapes, which varied with the foil spacing and cavitation number, is very complicated, and no simple mode can be found. The linear theoretical model in this article is suitable for the problem of cavitation flow around multiple hydrofoils with different chord length, camber, and angle of attack.

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