Cooperative Research on Surface Propeller

1.采用4种表面螺旋桨，在拖曳舱、空化隧道和高速循环水通道中进行了模型试验。从实验结果中，我们得到了许多有趣的发现，并证实了超空泡螺旋桨适用于水面螺旋桨。我们开发了一个QCM代码来使用一个新的尖马蹄涡系统。该方法可以方便地预测螺旋桨特性，得到等效的二维机翼。将该二维翼与二维线性空化翼理论相结合，开发了评价空化预翼特性的计算机程序。计算结果与实验结果吻合较好。我们还开发了一个计算空化水翼周围流动的计算机程序，并将其应用于韦德型和唇杯型水翼，证实了该方法的实用性。针对非定常螺旋桨问题，提出了面板法。该方法可以计算出螺旋桨叶片上的瞬时压力分布。提出了线性涡盘法来计算非线性空化叶的流动。将该方法应用于超空泡螺旋桨的设计。所设计的螺旋桨与实验特性吻合较好。利用QCM和边界元法，对螺旋桨在空化隧道中增加推力和扭矩的机理进行了数值分析。开发了简单、高效、准确的二维和三维机翼绕流计算方法，并将其应用于串列水翼问题。SQCM具有应用于各个领域的可能性。

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.