四桨推进船舶螺旋桨负荷数值计算分析

摘要

This study investigates the uneven load distribution of the internal and external propellers of a four-pro-peller ship.Hybrid grid technology was applied to calculate the hydrodynamic performances of the propellers.The factors that influence load imbalance between the internal and external propellers were analyzed in detail.The une-ven load distribution was analyzed in the context of the wake-flow field.Results showed that the front and rear pro-pellers are mutually affected, and that the internal rear propeller is more affected than the external rear propeller given that it lies in the wake flow of the external front propeller.In addition, the circumferential prewhirling wake-flow opposite that of the rotation direction of propeller can effectively increase the load of the propeller.These effects are more apparent under high wake-flow speed.The double-arm axial bracket, which lies in the near front of propeller, has an important effect on the wake-flow field in front of the propeller.The load difference between the internal and external propeller can be reduced by appropriately adjusting the angle of the axial bracket.%针对四桨船舶内外桨负荷分配不均匀的情况,本文采用混合网格技术,对四桨船舶螺旋桨水动力性能进行了计算.分析了附体以及内外桨相互干扰对螺旋桨负荷的影响,从伴流场的角度分析了内外桨负荷不均匀的原因.研究发现:前后桨之间相互影响,内后桨处于外前桨的尾流中,所以内后桨受影响更大;与螺旋桨旋转方向相反的周向预旋伴流,可有效提高螺旋桨负荷,且伴流速度越大,效果越明显.双臂轴支架位于螺旋桨近前方,对桨前伴流场具有重要影响,合理调整轴支架角度,可以达到减小内外桨负荷差的目的.