Abstract: The cavitation of a push-type ducted azimuth propulsor with the design target of balancing the large thrust under bollard condition and the required speed is numerically simulated under the maximum speed condition and the bollard conditions by using the Reynolds-Averaged Navier-Stokes (RANS) method with the SST k-ω model and Schnerr-Sauer cavitation model. The calculated cavitation pattern is generally in accordance with the experimental results. It captures the sheet cavitation on the back blade, the blade face cavitation, the tip-vortex cavitation and the tip-leakage cavitation. The propeller-hull vortex (PHV) cavitation is observed due to the close distance between the strut and the duct and ducted propeller. The correlation between the distance of the strut and the ducted propeller and the strength of the PHV is then analyzed to propose the distance that can suppress the generation of the PHV. The distance which is greater than 0.35D can basically eliminate the PHV. It provides an important support for the optimization design of the ducted azimuth propulsor based on the cavitation performance.

Key words: ducted azimuth propulsor, cavitation, Schnerr-Sauer model, propeller-hull vortex

摘要： 该文以兼顾系柱大推力和航行速度为设计目标的推式导管舵桨为研究对象,采用RANS方法中的SST k-ω模型,选择Schnerr-Sauer空泡模式,考察航行和系柱工况下的空泡数值模拟结果,并与模型试验结果相比,得到的空泡形态大致与试验结果相符合,能够很好地捕捉到叶背片空泡、叶面空泡、梢涡空泡、梢隙空泡。因为吊柱与导管、导管桨的距离较近,出现了连体涡空泡现象,文中进一步分析了吊柱-导管桨距离与连体涡强度的关系,提出抑制连体涡空泡产生的距离（即距离大于0.35D,可基本消除连体涡空泡）,对基于空泡性能的导管舵桨优化设计提供了重要支撑。

关键词: 导管舵桨, 空泡, Schnerr-Sauer模式, 连体涡