面元法计算桨后舵附推力鳍水动力性能

为了提高船舶的推进性能,达到节能的目的,采用升力面法和基于速度势的面元法分别计算螺旋桨与舵附推力鳍的水动力性能,对影响推力鳍助推性能的几个主要参数进行了变尺度研究.采用双曲面元以消除面元间的缝隙,采用迭代计算来处理螺旋桨与舵附推力鳍的相互干扰.计算了在舵附推力鳍影响下螺旋桨尾流场周向诱导速度沿径向的分布.从理论上说明了推力鳍的助推节能原理,分析了加装舵附推力鳍之后螺旋桨水动力性能的变化.计算结果表明,舵附推力鳍可以吸收螺旋桨尾流场的部分旋转能量产生附加推力,其助推效率可达3%～4%.

Research on performance of rudder with additional thrust fin by panel method

To improve the propulsion performance of ships,a lifting surface method and panel method were used to analyze a propeller and rudder with an additional thrust fin.The principal parameters that affect additional thrust efficiency of the thrust fin were investigated under changing dimensions.Hydrodynamic interaction was determined by interactive calculations.In the process,the hyperboloidal quadrilateral panels were employed to avoid gaps between the panels.The distribution of radial velocity of water behind the propeller was determined when there was a rudder with an additional thrust fin.A performance comparison between a propeller with an additional thrust fin and a propeller without an additional thrust fin showed an energy savings associated with the additional thrust fin.Calculations indicate the additional thrust fin can reclaim energy of the wake behind the propeller.The efficiency of an additional thrust fin ranged from three percent to four percent.