基于NURBS的叶片全三维气动优化设计

THREE-DIMENSIONAL BLADE AERODYNAMIC OPTIMIZATION DESIGN BASED ON NURBS

采用NURBS对叶轮机械叶片的关键截面和基迭线进行参数化表达,该表达方法为基于现代优化算法的叶片粘性气动最优化设计提供设计变量,以实现对叶片截面和叶片基迭线弯、倾、扭、掠变形的控制。该方法编写成的叶片全三维控制模块和网格自动生成程序、CFD程序集成到商业软件iSIGHT中,构成了叶片全三维粘性气动优化设计平台。在该平台上选用ASA成功进行了某透平静叶片的全三维粘性气动最优化设计。实验结果表明通过同时改变叶片截面和叶片基迭线的方法能够有效地抑制叶片的二次流损失,因此该设计平台在叶片气动优化设计中有广阔的应用前景。

Blade profile and stacking line of turbomachinery are represented using NURBS. This method provides blade optimization designs based on modern optimization tools with design variables to achieve deformations of blade profiles and stacking, lines, like lean, sweep and twist. This representation and deformation system is integrated with an autogrid generation code and a CFD code in the commercial software, iSIGHT, to construct the 3D aerodynamic optimization design system. A turbine stator blade optimization design was done in this design system, selecting the ASA. The optimization result showed that changing blade profiles and staking lines is effective to reduce the secondary flow. So the blade aerodynamic optimization design system has great foreground.