斜流中船后螺旋桨水动力性能及伴流场研究

Analysis of propeller hydrodynamics and wake flow field in Oblique Flow

为了探究斜流中船体尾部流场对于螺旋桨水动力性能与受力变化的影响,采用混合网格技术,通过RANS方法对DTMB4679螺旋桨的水动力性能及船尾桨盘面处伴流场进行了非定常数值计算,并与敞水工况下的计算结果进行对比分析。计算结果表明:在无斜流角时船尾伴流场基本对称,但由于船体对于流场有一定的阻滞作用,敞水工况的轴向速度大于船后工况,且船后螺旋桨具有更高的涡强度;随着斜流角度的增加,旋桨中线一侧的轴向速度增加,伴流场不均匀性增大,严重影响螺旋桨的推进效率与空泡性能。

In order to investigate how the flow field affect the hydrodynamic performance and force variation of propeller at hull tail,the hybrid grid is adopted to unsteady numerical compute propeller DTMB4679’s wake flow field by employing Reynolds-Averaged Navier Stokes(RANS)method.The results are compared with those under open water condition.The results show that the wake field of the stern is basically symmetrical without oblique flow angle,but the axial velocity of open water condition is greater than that of ship astern condition because of the blocking effect of ship hull on the flow field and the aft propeller has higher vortex strength.With the increase of the oblique flow angle,the axial velocity on the center line side of the rotor and heterogeneity of wake field increase.Moreover,the propelling efficiency and cavitation performance of the propeller are seriously affected.