二维兴波水翼水动力预报的涡分布法

本文用奇点面分布法预报二维自由面边界下水翼的水动力特性。采用线性化的自由面边界条件。水翼表面划分为若干单元，每个单元上布置线性分布的涡，并在其中点满足Ｎｅｕｍａｎｎ型物面边界条件。与试验结果比较表明，计算结果是合理的，本计算方法能显示二维兴波水翼水动力特性与Ｆｒｏｕｄｅ数，相对浸深和攻角的关系。

A Numerical Method for Calculating Hydrodynamic Characteristics of Two-dimensional Hydrofoil

This paper discribes a numerical method for solving the steady two-dimensional potential flow about the hydrofoil translating at arbitrary Froude number near a free water surface. The linerized free water surface condition is adopted. The body surface is divided into a lot of elements. The vorticity with linear strength is distributed over each element. The Neumann boundary condition at the midpoint of each element is satisfied exactly. The calculated results by using the present method are compared with expermental data. The relationships of hydrodynamic characteristics varied with attack angle, relative submergence and Froude number are illustrated.