中文摘要：

根据桨舵干扰思想,采用以速度势为基础的低阶面元法计算了均匀流中的螺旋桨与舵-舵球-鳍系统相互干扰的定常水动力性能,比较了普通舵及加装舵球、舵球鳍的舵的节能效果,并对影响舵球鳍节能效果的主要参数（舵球尺寸、鳍片尺寸和安装角度）进行了变尺度计算与分析.计算结果表明,舵球鳍节能效果较舵球为佳,并具有节能效果最佳的尺寸及安装角度.

英文摘要：

Rudder-bulb-fin is a kind of simple combined energy-saving device.According to the method of propeller-rudder system performance calculation,the steady interference between propeller and rudder-bulb-fin system in uniform flow was predicted by potential based surface panel method.The energy-saving effect of rudder with bulb-fin was compared with common rudder and rudder with bulb.Changing dimensions,the principal parameters（bulb size,fin size and installation angle） that affect energy-saving effect was studied.The theoretical studies show that the energy-saving effect of rudder-bulb-fin is better than that of rudder-bulb and the design of rudder-bulb-fin has optimal bulb size,fin size and installation angle.