考虑侧斜及纵倾情况下的船舶螺旋桨最佳环量分布计算

为了获知纵倾及侧斜对螺旋桨最佳环量分布的影响,采用升力线旋涡模型进行了计算分析.把集中的附着涡放置在桨叶的中线即弦长中点处,以计及桨叶侧斜和纵倾的影响,如果桨叶没有侧斜和纵倾,则升力线仍为径向线,否则升力线为一空间曲线.通过对计算结果的对比分析得出:增加纵倾分布可以增大推力系数;侧斜分布对轴向诱导速度的影响与切向诱导速度的影响相反;随着侧斜角的增加,内半径区内的水动力螺距角呈现增大的趋势,而在外半径区的水动力螺距角则呈现减小的趋势.

Numerical calculation of the optimal circulation distribution on a ship propeller considering skew and rake

The lifting line-vortex model was used to analyze the influence of the skew and rake on the optimal circulation of the propeller.The adhesion vortex was laid in the midline of the propeller blade when analyzing the skew and rake.If the propeller does not have a skew and rake,the lifting line also is a radial line;otherwise,the lifting line is a space curve.Though the comparison of calculation results,it is shown that the thrust coefficient is heightened,while the rake increases.The influence of the skew is in opposition between the axially induced velocity and tangentially induced velocity.Along with the increase of the skew angle,the hydro-pitch angle of the inner radial domain is increscent,but it presented the opposition phenomenon in the outer radial domain.