风雨场中舰船桅杆动力学特性研究

当舰船在风雨天气中航行时,桅杆的流场环境发生变化,为了确定此时桅杆所受流体载荷,应采用气液两相流的分析方法.利用计算流体力学软件进行数值模拟,研究了风雨场中桅杆受到的定常和脉动载荷以及流体绕流后漩涡的脱落形式,分析了在不同雷诺数和不同攻角的条件下,定常压力、脉动压力和斯特劳哈尔数的变化趋势,并与单相流的分析结果进行对比.通过分析发现,由于雨滴的加入增强了水流的扰动,风雨场条件下桅杆动力学特性发生了变化.

Simulating the hydrodynamic characteristics of a mast in heavy gusts of mixed wind and rain

When a warship travels through a combination of wind and rain,the flow field around the mast is continuously changing.In order to identify the air-flow load on the mast,the analysis must use the gas-liquid flow method.With the simulations carried out using computational fluid dynamics(CFD) software,the authors studied steady and fluctuating loads and the shape of vortex shedding in the flow at the end of mast in wind-rain fields.Moreover,changing trends of steady pressure,fluctuating pressure and St were analyzed under conditions of different Re and attack angle,and the results were compared with those only for wind field.The analysis showed that the involvement of rain-drops increases the disturbing effect of the fluid,changing the dynamic characteristic of the mast in wind-rain conditions.