变安装角推力鳍对吊舱推进器敞水性能的影响

Influence of thrust fins with different installation angles on open water performance of podded propulsor

采用计算流体力学(CFD)方法对拖式吊舱推进器的水动力性能问题进行研究.采用多参考系模型计算了相互干扰平均效果,得到不同进速系数下普通吊舱推进器的推力系数、转矩系数、敞水效率及侧向力,并绘制敞水性能曲线.提出了装有推力鳍的吊舱推进器,对不同安装角(0°,±2°,±4°)下的吊舱推进器进行水动力性能计算,并与普通吊舱推进器进行比较,同时分析推进器系统在不同安装角下的推力变化.通过观察吊舱推进器支架与舱体表面的压力云图以及推力鳍前的诱导速度变化,分析推力鳍对吊舱推进器水动力性能的影响.计算结果表明:增加推力鳍后吊舱推进器的水动力性能得到改进,适当改变鳍的安装角能够使改进效果更明显,同时推进器的侧向受力也得到优化,增加了船舶的航向稳定性.

The hydrodynamic performance of podded propulsors was simulated by means of computa- tional fluid dynamics （CFD）. The MRF model was used to simulate the average effect of interaction. The thrust coefficient, torque coefficient, open water efficiency and lateral force as a function of ad- vance coefficient were calculated, and the open water performance curves were obtained. The podded propulsors with thrust fins was proposed. The hydrodynamic performance of podded propulsors with thrust fins at different installation angles（0°,±2°,±4°）was calculated, then the result was com- pared with the performance of normal one, meanwhile the thrusts of propulsion systems were ana- lyzed. In the end, by observing the pressure distribution of strut with pod and induced velocity before the thrust fins, the influence of thrust fins on the podded propulsor was analyzed. The results shows that the hydrodynamic performance of podded propulsors is improved after installation of thrust fins, and appropriate change of the installation angle of thrust {ins makes the improvement more obvious. At the same time, the lateral force of propulsor is optimized, and the directional stability of ship is im- proved.