Abstract: The contra-rotating rudder propeller has the characteristics of good maneuverability and high propulsion efficiency, which is usually applied in ship types, such as science research vessels and offshore engineering ships. The open-water characteristics of the contra-rotating rudder propeller are simulated by using the improved delayed detached eddy simulation (IDDES) method, with comparative analyses based on the model test results. The results show that the numerical simulation errors of the thrust coefficient and the torque coefficients of the propulsion unit at the design point are within 3%. It is observed that the rudder angle has smaller impact on the open-water characteristics of the front propeller but larger impact on those of the aft propeller based on the open-water tests under different rudder angles. The transverse force of propulsion unit is 0 at the rudder angle of 2.5° in the current case. The influence of the strut on the tip vortex of the front propeller is studied through the cavitation model test. The cavitation is significantly enhanced when the tip vortex of the front propeller meets the blades of the aft propeller or the tip vortex of the aft propeller. Based on the interaction of all components of the contra-rotating rudder propeller, the induced velocity correction coefficient is introduced to transform the design of the blades of the contra-rotating rudder propeller into the design of the blades under the given incoming flow condition.

Key words: contra-rotating rudder propeller, computational fluid dynamics (CFD), open-water test, cavitation test

摘要： 对转舵桨兼有操纵性能良好和推进效率高的特点,在科考船、海洋工程船等船型上有一定数量的应用。该文采用改进的延迟分离涡模拟方法模拟了对转舵桨的敞水性能,并与模型试验结果进行对比分析,结果表明：设计工况推进单元的推力系数与转矩系数数值模拟误差在3%以内,满足工程精度要求。通过不同舵角下的敞水模型试验发现,舵角对前桨敞水性能影响较小,而对后桨影响较大,案例中约2.5°舵角时推进单元横向力为0。通过空泡模型试验,观察立柱对前桨梢涡形态的影响,发现前桨梢涡与后桨桨叶及后桨梢涡相遇使该位置的空泡现象显著增强。基于对转舵桨各部分相互影响关系,引入诱导速度修正系数,将对转舵桨的桨叶设计问题转化为给定来流条件的桨叶设计问题。

关键词: 对转舵桨, 计算流体力学（CFD）, 敞水试验, 空泡试验