基于OpenFOAM的某双艉鳍船快速性能研究

Study on the Powering Performance of a Twin-Skeg Ship Based on OpenFOAM

为研究双艉鳍船的艉鳍倾角和螺旋桨旋向对船舶快速性的影响,以OpenFOAM为工具,对模型尺度下的某双艉鳍船进行阻力和自航数值模拟,其中自航分为内旋和外旋2种工况。研究表明:与模型试验结果相比,阻力和自航数值计算结果的偏差均在3%以内,精度较高;将垂直艉鳍改为倾斜艉鳍,能改善艉部流动,减小低速区范围、流动分离和船体阻力;艉鳍形式和旋向对船舶推进效率的影响主要体现在船身效率上,伴流均匀性是影响船舶推进效率的主要因素之一。研究采用的基于OpenFOAM的快速性分析方法可供其他类型船的优化设计参考。

Resistance and self-propulsion simulations are conducted numerically to investigate the impact of the skeg inclination angle and propeller rotation direction on the powering performance for a twin-skeg ship,Two types of model-scale ships are calculated.OpenFOAM is used as the simulation tool.The self-propulsion calculations performed for both inward and outward rotation conditions.Compared with the model test results,the numerical calculation results showed a deviation of less than 3%,indicating a high accuracy.The study indicates that inclining the skeg from the vertical position can improve the flow at the stern,reduce the area of low-speed zones and flow separation,and thus decreased the hull resistance.The impact of skeg form and rotation direction on efficiency is primarily reflected in the hull efficiency,where wake uniformity is one of the main factors affecting efficiency.This performance analysis method based on OpenFOAM can be a rapid tool for ship type optimization design.