涡轮叶片逆向建模与特征参数提取

为了在已有涡轮叶片实物基础上进行再创新设计,采用激光扫描仪对涡轮叶片进行数字化扫描,提出了在三维测量得到涡轮叶片点云数据的基础上,准确进行逆向建模、反求几何参数和提取气动特征参数的逆向设计方法.根据涡轮叶片的几何参数反求和提取气动特征参数要求,基于获取涡轮叶片的截面点云图,用五次多项式曲线拟合叶盆和叶背,并用圆弧逼近叶形前后缘.基于该方法,采用Matlab软件对涡轮截面线点云进行拟合,反求得到了叶身型线方程,拟合偏差控制在之内,能够获得准确的叶片截面型线和气动特征参数. 

3D Model Reconstruction and Its Feature Parameters Extraction of a Turbine Blade

In order to achieve an innovation design of turbine blades, the point cloud data of an existing turbine blade was digitally acquired by a handy laser scanner, and then a reverse design methodology was proposed to accurately reconstruct a 3D digital model and extract the geometric and aerodynamic feature parameters from the point cloud data. In order to obtain the blade section profiles and extract the geometric and aerodynamic feature parameters accurately, using the point cloud data of the turbine blade, the pressure side and suction side were fitted with quintic polynomial curves, and the trailing and leading edges were approximated with the arc. The results show that using the methodology, the curve equation of blade section profiles can be approximated with a deviation in the range of with Matlab software, and the geometric and aerodynamic feature parameters can be extracted from these curve equations accurately.