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三元叶轮国内外发展概况：目前国内外三元叶轮设计可划分成两大类；正命题设计方法；逆命题设计方法。前者是先有叶轮的几何形状和尺寸再进行叶轮内流场分析，根据分析结果判断叶轮设计的好坏，再去修改所设计叶轮的形状和尺寸直到满意为止。不难想象，这类设计方法，不仅要求?
Overview of the development of the ternary impeller at home and abroad: At present, the design of ternary impeller at home and abroad can be divided into two categories; proposition design method; inverse proposition design method. The former is the first impeller geometry and size of the impeller flow field analysis, according to the analysis to determine the impeller design is good or bad, and then to modify the design of the impeller shape and size until satisfied. Not hard to imagine, this design method, not only required?