无轴轮缘侧推器水动力特性及影响因素分析

Analysis of hydrodynamic characteristics and influencing factors of shaftless wheel rim thruster

为了揭示船舶无轴轮缘侧推器的水动力性能,分析侧推器结构参数的影响规律,采用计算流体力学的方法对无轴侧推器进行数值计算,研究船首位置的无轴侧推器水动力性能、周围流场的分布规律及其水动力性能变化的影响参数,获得不同螺距比、盘面比及毂径比对无轴侧推器水动力特性的影响规律。结果表明:随着流速增大,无轴侧推器的推力系数和扭矩系数均增大;螺距比在0.7~1.2范围内,螺距比增大,无轴侧推器的推力系数和扭矩系数同时增大,推力系数比扭矩系数变化速率快;盘面比在0.3~0.9范围内,盘面比增大,无轴侧推器的推力系数和扭矩系数有所增加,但增加幅度较小,推力系数增长幅度在5%左右,扭矩系数变化幅度小于2.5%,毂径比对无轴侧推器水动力性能影响较弱。

In order to reveal the hydrodynamic performance of the ship's shaftless rim thruster and analyze the influence law of the thruster's structural parameters,the computational fluid dynamics method was used to simulate the shaftless thruster,and the shaftless side of the bow position was studied.The hydrodynamic performance of the thruster,the distribution law of the surrounding flow field and the influencing parameters of the change of the hydrodynamic performance were obtained.The results show that:with the increase of flow velocity,the thrust coefficient and torque coefficient of the shaftless thruster both increase;when the pitch ratio is in the range of 0.7~1.2,the pitch ratio increases,and the thrust coefficient and torque coefficient of the shaftless thruster are at the same time.increase,the thrust coefficient changes faster than the torque coefficient;when the disk-to-surface ratio is in the range of 0.3~0.9,the disk-to-surface ratio increases,and the thrust coefficient and torque coefficient of the shaftless side thruster increase,but the increase rate is small,and the thrust coefficient increases.The amplitude is about 5%,the torque coefficient variation is less than 2.5%,and the hub diameter ratio has a weak influence on the hydrodynamic performance of the shaftless thruster.