拖式吊舱推进器的水动力特性分析

拖式吊舱推进器的螺旋桨与吊舱之间干扰剧烈,流动现象较为复杂,为研究拖式吊舱推进器的水动力特性,基于粘性理论,滑移网格技术,借助商用流体计算软件FINE/Marine,分别完成了三维实尺度的裸桨及吊舱推进器的敞水性能数值模拟。着重在吊舱对螺旋桨水动力性能的影响、吊舱侧向受力、吊舱表面压力和周围流场速度分布方面进行了分析。结果表明,由于吊舱的存在,螺旋桨的推力扭矩均有所提升,但是整体推进器的效率没有明显改善,反而使螺旋桨推力波动增大;吊舱在螺旋桨尾流影响下会产生额外的侧向力。

Analysis of hydrodynamic characteristics of pull podded thruster

The interference between the propeller and the pod of the pull POD thruster is strong,and the flow phenomenon around the thruster is complicated.In order to study the hydrodynamic characteristics of the pull POD thruster,based on the viscous theory,the sliding mesh technology,using the commercial fluid calculation software FINE/marine,the numerical simulations of the open water performance of a three-dimensional real-scale propeller and a pull POD thruster were completed.The hydrodynamic performances of the propeller with or without the pod were compared and analyzed.The transverse force of the pod,surface pressure of the pod and velocity distribution of the flow field around the pod were analyzed.The results show that the thrust and torque of the propeller are improved due to the existence of the pod,but the efficiency of the overall thruster is not improved and the thrust fluctuation is increased;due to the wake of the propeller,the pod generates additional transverse force.