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为解决轴流压缩机叶片改型设计、气动优化及运行过程的叶片修复等实际工程中需要基本实物的数字化模型问题,采用便携式激光扫描技术开发出一套高精度高效率的轴流压缩机叶片逆向设计流程。针对轴流压缩机叶片的几何特征和气动优化设计要求,采用激光三角法在叶片进气边、出气边及叶顶处添加辅助平面与标记点,提高了叶片点云数据采集效率;针对叶片的叶身区域拟合曲面精度低和榫头区域四边域曲面片自相交的问题,提出一种基于流线、轴面截线、轮廓及其延伸线的交互式叶片曲面片划分方法,按“探测轮廓及其延伸线-细分并延展轮廓线-构造曲面片-修理曲面片”流程远用人机交互添加辅助轮廓线的方法将榫头端面区域等非四边N边域用数个四边域子曲面表示,获得了满足工程需要的曲面模型。研究开发出了一套包括叶片点云数据采集、处理、各曲面重构、精度评价在内的轴流压缩机叶片高效率反求技术,该技术可以在大型轴流压缩机维修实际工程中应用。
In order to solve the digital design problem of axial compressor blades retrofit design, aerodynamic optimization and blade repairing during operation, the portable laser scanning technology was used to develop a set of high-precision and high-efficiency axial compressor blades Reverse design process. According to the geometrical characteristics and aerodynamic optimization design requirements of the axial compressor blades, the laser triangulation method is used to add auxiliary planes and marked points on the intake side, the exit side and the tip of the blade to improve the data collection efficiency of the blade point cloud. The blade surface area fitting surface is of low precision and the self-intersecting of the four sides of the tenon area, an interactive leaf surface slice division method based on streamline, axial section line, contour and extension line is proposed. According to the detection of “ Contour and its extension line - Subdivide and extend the contour line - Construction patch - Repair surface piece ”Process Far with human-computer interaction to add auxiliary contour line The non-quadrilateral N edge area such as the tenon end surface area with four quadrilateral sub-surface Said that obtained the surface model to meet the needs of the project. The research and development of a set of high-efficiency reverse-flow technology of axial compressor blades, including data acquisition and processing of leaf point cloud, reconstruction of each surface, and accuracy evaluation, can be applied in the practical engineering of large-scale axial compressor .