标称伴流尺度效应的数值模拟

为了研究标称伴流场的尺度效应，对不考虑自由液面效应的KCS船的粘性绕流场进行研究，并基于RANS方法和SST k-ω模型对包含实尺度的7种不同尺度下的标称伴流场进行数值计算。然后，将模拟结果与试验数据进行对比，进一步分析标称伴流场的尺度效应。结果显示：各半径处平均轴向伴流分数的倒数与雷诺数的对数呈正相关；KCS裸船体桨盘面处的标称伴流场存在2个伴流峰，且伴流峰值会随雷诺数的增加而减小，有利于减小螺旋桨的空泡和激振力；小尺度模型的尺度效应更为明显，且内半径处的平均轴向伴流分数尺度效应问题比外半径处的更为严重。

Possibility of air-filled rubber membrane for reducing hull exciting pressure induced by propeller cavitation

In order to study the scale effect of the nominal wake field, the viscous flow field of KCS is studied without considering the free surface effect, and the nominal wake fields of KCS at different scales including full scale are solved numerically using the RANS method and the SST k-ω turbulence model. By comprehensively comparing the computed results with experimental data, the scale effect of the nominal wake field is further investigated. This shows that the reciprocal of the mean axial wake fraction at each radius exhibits a near-linear dependence on the Reynolds number in a logarithmic scale; for the nominal wake field of the propeller disc of KCS without a propeller, two wake peaks exit, and the amplitude of the axial wake peak decreases with the increase of the Reynolds number, which is conducive to a decrease in propeller exciting force and propeller cavitation; the scale effect of the small scale model is more obvious, and the scale effect of the mean axial wake fraction in the inner area is stronger than it is in the outer area.