复杂曲面螺旋桨实体模型参数化设计与分析

Parameterized Design and Analysis of the Complicated Curved-surface Propeller in Solid Modeling

螺旋桨是一种特殊的复杂曲面零件,根据其结构特点和工艺要求定义参数化变量,推导出螺旋桨叶切面局部坐标系到全局坐标系的坐标转换公式,采用Matlab编程技术解决将不同图谱形式提供的叶切面几何参数应用到三维CAD建模过程的问题,通过Solidworks软件曲面放样、曲面缝合和曲面加厚等命令完成复杂曲面螺旋桨的实体造型,参数化的设计过程提高了系列螺旋桨的生成效率。在此基础上,运用计算流体动力学(CFD)理论,结合RANS方程和RSM湍流模型对所建立的DTMB4119桨模型进行了敞水性能数值计算,计算结果与试验数据吻合较好,验证了本文实体造型方法的精确性,同时也说明所采用的数值计算方法适于螺旋桨敞水性能的求解。

The propeller is a complicated curved-surface part. The parameterized variable is defined according to the configuration features and the technics demand,and then the coordinate transformation formula of transforming the local coordinates of the points on section planes to the global coordinates is deduced,and the problem of applying different geometric parameter atlases to solid modeling is resolved using Matlab process.Then demands of surface lofting,knitting and thickening etc.are used to complete the solid modeling.The process of parameterized design improves the efficiency of serial modeling.After that,computational fluid dynamics（CFD） method is used to simulate the open-water performance of the propeller DTMB4119 by using the Reynolds-Averaged Navier-Stokes（RANS） equation and Reynolds Stress Model（RSM）.The computational results agree well with the experimental data.It shows that the method of solid modeling is accurate and the numerical simulation has good accuracy in the prediction of propeller open-water performance.