Development of Estimation Method for Propulsive Performance of High Speed Ship

三年来的研究结果如下：作为厚翼理论的一种，我们提出了SQCM (Source + QCM)，其特点是通过求解一次线性联立方程即可满足三维机翼的库塔条件。SQCM适用于非常薄的机翼（厚度弦比=0.001）。本文成功地将SQCM应用于均流带毂螺旋桨。利用等效二维机翼和线性化空化理论，提出了一种计算空化条件下机翼特性的方法。将上述方法应用于超空泡螺旋桨。计算结果与实验结果吻合较好。这种方法给常规螺旋桨造成了过大的空化。在SQCM的基础上，提出了一种二维机翼局部空化流的计算方法。该方法正在推广到超空泡流中。为了分析螺旋桨在非均匀流动中的特性，提出了一种计算二维机翼在非均匀流动中的特性的方法。基于朗肯源法，我们计算了宽船和高速水翼船周围的波浪流。本文提出了一种考虑姿态变化的高速水翼船绕流计算方法。提出了一种在空化条件下工作良好的螺旋桨设计方法。

The results obtained for three years are as follows.1.As one of thick wing theories, we developed SQCM (Source + QCM) whose feature is that Kutta condition for 3-D wing is satisfied by solving once the linear simultaneous equations. SQCM is applicable to very thin wing (thickness chord ratio=0.001).2.SQCM is successfully applied to the propellers with hub in uniform flow.3.We developed a method to calculate the charactieristics of wing in the cavitating condition, making use of the equivalent 2-D wing and linearized cavitation theories.4.Above method was applied to supercavitating propellers. The results were in good agreement with experimental ones. This method gave excessive cavitation for the conventional propellers.5.Based on SQCM,we developed a method to calculate partially cavitating flow on a 2-D wing. This method is being extended to the supercavitating flow.6.Aiming to analyze the characteristics of propellers in nonuniform flow, we developed a method to calculate the characteristics of 2-D wing in unsteady flow.7.Based on the Rankine source method, we calculated the wave flows around wide ships and a high speed ship with hydrofoils.8.We developed a method to calculate the wave flow around a high speed ship with hydrofoils, considering the change of attitude.9.We proposed a method to design a propeller working well in the cavitating condition.