基于激光扫描的轴流压缩机叶片反求技术探讨  

Exploratory Study of the Reverse Solution-seeking Technology for Axial Flow Compressor Blades Based on the Laser Scanning

作　　者：宋威[1] 赖喜德[1] 李广府[1] 张伟[1] 

机构地区：[1]西华大学能源与环境学院,四川成都610039

出　　处：《热能动力工程》2013年第5期455-460,548,共6页Journal of Engineering for Thermal Energy and Power

基　　金：四川省教育厅成果转化培育项目(11ZZ002);西华大学研究生创新基金(Ycjj2013105);西华大学"西华杯"资助项目(2013407);西华大学流体及动力机械省部共建教育部重点实验室学术成果培育项目(SBZDPY-11-7)

摘　　要：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。To solve the problems relating to numerical models for blade modification design,aerodynamic optimization and repairing based on a real object in actual engineering projects during operation of an axial flow compressor,the portable type laser scanning technology was used to develop a high precision and efficiency flow path for reverse design of axial flow compressor blades. In compliance with the geometrical characteristics of and aerodynamic optimization design requirements for axial flow compressor blades,the laser triangular method was adopted with auxiliary planes and marking points being added to the blade leading edges,trailing edges and tips,enhancing the point cloud data acquisition efficiency of the blade. In the light of the problem that the curved surface in the blade body zone had a low fitting precision and the curved surface pieces around the tenon area were of self-intersection,an interactive method for dividing the curved surface pieces of the blade based on the flow streamlines,meridian lines,contour lines and their extension lines was proposed to express the tenon end surface area of non-four-edges but N-edges by using several curved surface pieces of four edges according to the flow path ' detect the contour and its extension lines-subdivide and extend the contour lines-structure the curved surface pieces-repair them' with the method for man-machine interactively adding auxiliary contour lines being employed and obtain a model for the curved surface meeting the requirements for engineering projects. A high efficiency reverse solution-seeking technology for axial flow compressor blades was studied and developed,including point cloud data acquisition,processing,curved surface restructuring and precision evaluation of a blade. The technology in question can be applied in an actual engineering project when repairing a large-sized axial flow compressor.

关 键 词：轴流压缩机叶片 反求技术 点云数据采集 曲面重构 

分 类 号：TK474.8[动力工程及工程热物理—动力机械及工程]