基于CATIA的轴流风机叶片仿生参数化建模

Parameterized modeling of bionic blade of axial fan based on CATIA

为解决轴流风机仿生叶片三维造型不能直接应用提取的鸟翅膀翼型问题,通过对风机叶片的几何分析,推导出叶片二维平面叶型坐标到三维空间坐标的转换关系。运用EXCEL对叶型截面各离散点进行处理得到相应的空间坐标;基于CATIA的自由曲面造型功能生成叶片曲面,再转化成实体叶片;采用FLUENT对所设计的轴流风机模型进行仿真分析,计算结果与设计要求比较吻合。

The profiles of bird wings and the special structural morphology of wing features give the wing excellent aerodynamic characteristics. However, the wing profile and structural parameters can not be directly applied in computer aided design of axial fan blade. To solve this problem in axial fan bionic blade design, the geometry of fan blade is analyzed first; then the coordinate transformation of two-dimensional （2D） cross-section parameters of fan blade to three dimensional （3D） space is introduced. 2D coordinates of discrete points of the cross-section are handled with EXCEL to obtain 3D coordinates. The blade surface is created based on the free surface modeling function of CATIA to establish the 3D model of the blade. Computer simulation analysis is conducted by using FLUENT and results agree well with the design requirements.