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本文以 S_1、S_2流面理论为基础,对实际流动进行平均化处理,建立起混流式水轮机转轮设计的一种准三元方法。S_2流面采用有限元计算,S_1流面采用积分法计算。该设计方法不仅考虑了连续方程和叶片微分方程,还考虑了水流的运动方程,使计算出的轴面流场更符合实际情况,从而可提高水轮机转轮设计的命中率。以该方法为基础所开发的混流式转轮准三元设计系统,成功地应用于三峡电站水轮机转轮设计,表明该设计方法是实用和有效的。
Based on S_1 and S_2 flow surface theory, this paper averages the actual flow, and establishes a quasi-ternary method for the design of Francis turbine runner. S_2 flow surface using finite element calculation, S_1 flow surface using integral method. The design method not only considers the continuous equation and the differential equation of the blade, but also considers the equation of motion of the water flow so that the calculated axial flow field can be more in line with the actual situation, thereby improving the hit rate of the turbine runner design. The quasi-ternary design system of mixed-flow runner developed on the basis of this method has been successfully applied to the turbine runner design of Three Gorges Power Station, which shows that the design method is practical and effective.