轴流式水轮机叶片建模与优化

MODELING AND OPTIMIZATION OF AXIAL FLOW TURBINE BLADES

在枯水期,由于转轮叶片效率低,一些地区轴流式转轮不能发电。为了解决这一问题,改善转轮叶片非圆曲线的设计尤为重要。当前,CAD软件不能够对非圆曲线进行延伸,在分析其原因的基础上引入了趋势外推法。研究了各段翼型截面的分布规律,建立了多项式曲线延伸数学模型,利用MATLAB软件的编程找到叶片已知点的内外侧延伸点以及运用MATLAB软件的曲线拟合功能来改善叶片的形状,以使叶片表面趋于光滑,从而减小功率损耗和提高运行效率。为了完善非圆曲线智能延伸功能,基于C++编程,对NX软件进行二次开发,进一步优化了轴流式转轮叶片。

Due to the low efficiency of runner blades, axial flow runner in some areas cannot generate electricity during dry season. To solve this problem, it is particularly essential to improve the design of non-circular curves for runner blades. Non-circular curves cannot be extended by CAD nowadays. Trend extrapolation method was introduced on the basis of analyzing the reason. The distribution regularity of various airfoil sections was researched. Polynomial curve extension mathematical model was established. The inside and outside extension points of known points for blades were found by adopting MATLAB programming. The shape of blades was improved by using the curve fitting function of MATLAB so that the surface of blades tends to smooth, which will reduce losses and improve efficiency To improve the intelligent extension function of non-circular curves, the secondary development of NX based on C＋＋ programming was conducted. The axial flow runner blades were further optimized.