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| Surface reconstruction technique for kaplan turbine blades |
| LAI Xi-De, LI Guang-Fu, ZHANG Wei-Bin, WANG Li-Fa |
(School of Energy and Environment, Xihua University, Chengdu, Sichuan 610039, China) |
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Abstract Some surface reconstruction related issues as Scattered point cloud data acquisition, data pretreatment, triangulation, NURBSbased surface reconstruction Methods, inspection of fairness and accuracy ,ect,were discussed in detail.Then the process of surface reconstructing freeform surfaces of mechanical parts such as tubomachine blades was presented. For solving the problem of surface reconstruction of kaplan turbine blade contours based on scattered data, the basic theory of surface reconstruction was reviewed and a blade surface was divided into various regional blocks based on its feature in shape; then a method for constructing a surface patch in a rectangular domain whose four boundaries were two streamlines and two interaction curves between a blade and a meridian plane was proposed. As a result of those, a 3D model of blade that meets design requirements was yielded. The efforts show that the digital geomety model constructed by this method has good smoothness and accuracy. It proposed a foundation for the subsequent work and provides an objective basis for reverse engineering applied in fluid machinery industry.
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Received: 22 September 2012
Published: 30 November 2012
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