基于CFD的螺旋桨附加毂帽鳍节能性能仿真分析

CFD-based simulation analysis of energy-saving performance of propeller with boss cap fins

  • 摘要:
    目的 旨在研究螺旋桨附加毂帽鳍(PBCF)对船舶推进装置性能的影响及其优化,验证毂帽鳍的节能效果并给出最优设计参数,以达到降低能耗、提升航行效率的目的。
    方法 通过CFD定常计算的方法分析螺旋桨上安装毂帽鳍的节能机理,采用SST k-ω湍流模型进行计算。在对其机理研究的基础上,分析毂帽鳍安装角、轴向位置、直径等参数对整体水动力性能的影响规律。
    结果 结果表明:安装毂帽鳍能削弱毂涡强度,回收尾流能量,消除毂帽上的低压区,同时鳍叶上会产生负转矩,从而提高效率。研究表明,在所研究参数范围内,当安装角接近螺旋桨叶根处的螺距角时,节能效果最佳;轴向位置的增加能一定程度上提升节能效果,但增加到一定距离后,部分进速系数下的推进效率会出现下降;而毂帽鳍直径在0.26D时,具有更高的节能效果。
    结论 研究结果可以为后续螺旋桨附加毂帽鳍的节能效果研究提供参考。

     

    Abstract:
    Objective This paper aims to study the impact of propeller boss cap fins on the performance of ship propulsion devices and their optimization, verify the energy-saving effects of the fins and provide the optimal design parameters to achieve the goal of reducing energy consumption and improving navigation efficiency.
    Method The energy-saving mechanism of installing boss cap fins on propellers is analyzed via CFD steady state calculation using the SST k-ω turbulence model. By studying the relevant mechanisms, the influence laws of parameters such as the installation angle, axial position and diameter of the boss cap fins on the overall hydrodynamic performance are analyzed.
    Results The results show that installing boss cap fins can weaken the hub vortex strength, recover the wake energy, eliminate the low-pressure zone on the fins and generate negative torque on the fin blades, thereby improving efficiency. Within the range of the studied parameters, when the installation angle is close to the pitch angle at the root of the propeller blade, the energy saving effect is best. The increase in axial position can improve the energy-saving effect to a certain extent, but when it is increased to a certain distance, the propulsion efficiency under the partial acceleration coefficient will decrease. When the diameter of the boss cap fins is 0.26D, the energy-saving effect is higher.
    Conclusion The results of this study can provide useful references for the future improvement of the energy-saving effect of propeller boss cap fins.

     

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