舰船偏离航道中心运动时水压场的计算方法

本文给出了舰船以亚临界航速偏离航道中心运动时水压场的计算方法。在船体细长、水深较浅的情况下,通过渐近匹配展开法可以得到舰船运动在矩形航道中的扰动速度势控制方程。用纵向分布源涡代替舰船的存在,为满足边界条件需要使用映像原理。从文献知道,源强正比于舰船横截面面积的变化率,涡强需从一个积分方程求取。通过数值计算得到源涡强度分布后,即可求出航道中舰船的扰动压力分布。

A Calculation Method of Hydrodynamic Pressure Field on a Ship Moving off the Centerline of a Channel

In this paper a calculation method of hydrodynamic pressure field on a ship operating off the centerline of a channel at a subcritical speed is presented. Under the conditions of slender ship and shallow water,the control equation of perturbance velocity potential on a ship moving in a channel of rectangular cross section is derived by using the method of matched asymptotic expansions,the ship is replaced by a distribution of sources and vortices, which must have the proper image systems so that the boundary conditions are satisfied. According to the papers 1]and2], the source strength is proportional to the change in crosssectional area of the ship, an integral equation must be solved to find the vortex strength. The perturbance pressure distribution on a ship maneuvering in a channel can be obtained after knowing the source and vortix strength by numerical calculation.