四桨船舶螺旋桨轴承力数值预报研究

Numerical prediction research of propeller bearing force for a four-screw ship

本文基于RANS方法和VOF模型,建立四桨船裸船阻力及自航性能数值预报模型,开展船桨一体数值模拟研究。对比分析内外桨载荷时均值及脉动值的差异,并结合伴流场谐调分析,论述内外桨轴承力差异的原因。研究发现:就载荷均值而言,内桨的轴向载荷分别大于外桨轴向载荷;就载荷脉动值而言,外桨轴向载荷脉动值大于内桨,这是由于桨盘面伴流场各阶谐调分量的差异造成的,在直航工况下,内外桨之间的相互影响较小,相比较而言,外桨工作对内桨性能的影响更大。

Based on RANS method and VOF model,a numerical prediction model for resistance and self-propelled performance of a bare ship with four propellers was established,and the integrated numerical simu-lation of the ship and propellers was carried out.The differences in the mean values and pulsation values of the inner and outer propeller loads were compared and analyzed,and combined with the wake field harmonic analysis,the reasons for the difference in the bearing forces of the inner and outer propellers were discussed.The results show that in terms of the average load,the axial load of the inner propellers was greater than the axial load of the outer propellers,as far as the load fluctuation value is concerned,the axial load fluctuation values of the outer propellers are greater than those of the inner propellers,which is caused by the difference in the harmonic components of each order of the wake field on the propeller disk.In direct sailing conditions,the mutual influence between the inner and outer propellers is relatively small.In comparison,the work of the outer propellers has a greater influence on the performance of the inner propellers.