基于流动数值分析的水轮机蜗壳优化设计研究

利用CAD-CFD现代设计分析方法,对理论和实际蜗壳的设计方法及其内部流动进行了深入研究,探讨了蜗壳流动均匀对称性、水力损失以及环量的形成与蜗壳几何尺寸和形状的关系,总结了提高蜗壳工作性能的措施。流动数值模拟研究表明,在利用传统的"等速度矩"法设计的蜗壳的基础上,通过增大鼻端区域的断面面积,可优化蜗壳出口水流的流动均匀对称性,调整蜗壳进口断面面积可改变蜗壳形成的环量。

The study on optimization design of spiral case of hydraulic turbine based on numerical flow analysis

The method of CAD-CFD analysis was used to study the design method of the theory and practice spiral case and its internal flow,the relation between the axial symmetry and uniform flow,hydraulic loss,formation of circulation and overall dimensions of spiral case were discussed,and the measures to improve its working performance were summed. The results indicate that the axial symmetry and uniform flow can be optimized by enlarging the sectional area of the nose section and the circulation can be changed by adjusting the inlet area on the basis of the traditional spiral case designed by"circulation".