螺旋桨设计参数对桨叶片空泡性能的影响分析

文章基于扰动速度势面元法建立了在均流条件下螺旋桨桨叶片空泡数值预报方法,空泡模型采用压力恢复闭合模型。通过对5600TEU集装箱船螺旋桨空泡的数值预报,以及与试验结果的比较,验证了该方法的可行性。该方法能够较为快速准确地预报螺旋桨桨叶片空泡,可用于分析参数对螺旋桨空泡性能的影响,为抑制螺旋桨空化设计提供基础。在此基础上重点分析了桨叶侧斜、纵倾以及桨叶剖面型式对螺旋桨空泡性能的影响,计算表明加大侧斜能够减少空泡面积,空泡向外半径偏移;桨叶剖面的设计对空泡性能影响较大,优化设计桨叶剖面可以有效减少空泡面积,提高螺旋桨抗空化能力;纵倾向压力面弯曲的分布形式可以改善梢部的压力分布,减少叶梢附近空泡长度,从而可望减少由空泡引起的脉动压力。

Numerical study on the effect of the propeller design parameters on its sheet cavitation performance

This paper adopts surface panel method based on perturbation potential to predict sheet cavita-tion on marine propeller. The termination model of cavity is assumed by pressure recovery law and the de-tachment is specified at leading edge. The validation studies of a 5600TEU container ship propeller for steady cavitating flow are presented, and the calculation results are in acceptable agreement with the experimental observations. The effects of some parameters such as skew, rake distribution and blade sections on pro-peller cavitation performance are studied. The results show that with the skew increasing, the cavity extent will decrease. The blade section has strong effect on its cavitation performance and optimal blade section design can obviously achieve better cavitation performance. Tip rake distribution curvature to pressure side can decrease the cavity extent near the tip region and thus can reduce the fluctuating pressure induced by propeller cavitation.