Development of Estimation Method for Propulsive Performance of High Speed Ship

1.作为厚翼理论的一种，我们发展了SQCM（Source + QCM），其特点是通过一次求解线性方程组来满足三维机翼的Kutta条件。SQCM适用于厚度弦比为0.001的超薄机翼; 2. SQCM成功地应用于均匀流中的带桨毂螺旋桨; 3.利用等效二维机翼和线性化空泡理论，建立了空泡条件下机翼特性的计算方法; 4.将该方法应用于超空泡螺旋桨。计算结果与实验结果吻合较好。5.基于SQCM方法，建立了二维机翼局部空泡流场的计算方法。6.针对螺旋桨在非均匀流场中的特性，提出了一种计算二维机翼在非定常流场中特性的方法; 7.基于Rankine源方法，计算了宽船和高速水翼船的波浪绕流; 8.提出了高速水翼船波浪绕流的计算方法，提出了一种空泡条件下螺旋桨的设计方法。

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.