Cooperative Research on Surface Propeller

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1.Using four kinds of surface propellers, model tests were made in the towing tank, the cavitation tunnel and the high-speed circulating water channel. From experimental results, we obtained many interesting findings and confired that the supercavitating propellers are suitable for the surface propeller.,2.We developed a QCM code to use a new pointed horseshoe vortex system. This method can predict the propeller characteristics easily and obtain the equivalent 2-D wing. Combining this 2-D wing and the 2-D linear cavitating wing theory, we developed a computer code to evaluate the characteristics of cavitating prepellers. Calculated results showed good agreement with experients.3.We also developed a computer code to calculate the flow around the cavitating hydrofoil and applied it to the Waid foil and foils with lip cups, and confirmed that this method is very useful.4.The surface panel method was developed for the unsteady propeller problems. This method can calculate the instantaneous pressure distribution on the propeller blade.5.We developed the linear vortex panel method to calculate the flow about the nonlinear cavitating foil. This method was applied to the design of supercavitating propellers. The designed propellers showed good agreement with the experimental characteristics.6.Using QCM and BEM, we clarified numerically the mechanism that the propeller increases thrust and torque in cavitation tunnel compared with P.O.T.7.We developed the simple, efficient and accurate SQCM to calculate the flow around 2-D and 3-D wings, and applied SQCM to the problem of the tandem hydrofoil. SQCM has possibility to be used in various fields.