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用一个周向平均的Ｓ２ｍ流面与一组Ｓ１流面的迭代计算构成有旋流动的准三元计算模型以计及有限叶片数影响，设叶片中面为流面并在其上给定Ｖθｒ及厚度分布进行混流转轮叶片设计。以三峡转轮为例，按该法设计，可以得到满足给定负荷及厚度分布的转轮，与全三维反问题计算结果十分接近。说明该法为一种新的有效的叶片设计计算模型和方法。
A quasi-ternary computational model with swirling flow is constructed by iterative calculation of a circumferential average S2m flow surface and a set of S1 flow surfaces to account for the influence of the finite number of blades. The middle surface of the blade is a flow surface and given Vθr And the thickness distribution of mixed runner blade design. Take the Three Gorges runner as an example, according to the design of the method, the runner with a given load and thickness distribution can be obtained, which is very close to the calculation result of the full three-dimensional inverse problem. It shows that this method is a new and effective model and method of blade design calculation.