双臂轴支架的剖面形状和安装角度对船舶伴流场的影响

水面船舶的艉部附体不但影响船舶阻力,而且对螺旋桨盘面处的伴流场也会产生较大影响。以某大型四桨两舵水面船舶为研究对象,不考虑自由液面的影响,采用RANS方法对船体带附体的三维粘性流场进行数值模拟,重点分析双臂轴支架的剖面形状和安装角度的变化对船舶粘性阻力和标称伴流场的影响。经研究发现,依据轴支架前方流场速度矢量的方向来确定双臂轴支架的安装角度是工程上比较实用的做法。

Effects of Twin Shaft Bracket Section Profile and Installation Angle on Nominal Wake Field

The stern appendages of a surface ship have great effects not only on the resistance, but also on the nominal wake field. Taking a ship which installed four propellers and two rudders as example, numeri- cal simulation of the 3D viscous flow field on the hull with appendages was carried out based on RANS without considering the free surface effect. The analysis focused on the effects of the twin shaft bracket sec- tion profile and installation angle on the viscous resistance and nominal wake field. The results show that the installation angle of shaft bracket can be determined by the direction of flow velocity vector.