4. A Nonlinear Theory for Supercavitating Foil Sections

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This paper presents a nonlinear theory for supercavitating foil sections, where the transient flow model is applied. The calculation model is based on the Hess method. The cavity shape is obtained by an iterative procedure. The theory was applied to several cavitating foil sections and compared with the experiments. The results agreed well with the experiment for the supercavitating as well as partially cavitating conditions except for the following cases: (1) For the foil whose trailing edge is open, the effect of cavity from the trailing edge should be taken into consideration. It is necessary, therefore, to make the pressure of the trailing edge be the same as the pressure in cavity. (2) Appropriate modification is indispensable for the foil with cup at the trailing edge. In this case, the separation at the trailing edge of the foil upper side might be important for the revision. The theory has been extended to the foil between two parallel walls, and the cascade.
社団法人日本船舶海洋工学会の論文