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一、引言 自从吴仲华教授创立的叶轮机械三元流动理论广泛应用于叶轮机械的气动设计以来,S_1、S_2两类流面的三元迭代求解方法有了迅速发展。在准三元迭代计算中,由于流线在子午面投影是连续的,若给定远方进、出口参数及间隙站环量,就可一次解出多级叶片中心S_1流场,而S_2流面由于动静叶间有相对运动,在稳定流动下只能计算一有前后延伸空段的单排叶片段,且此延伸空段的参数是多级中心S_2流面计算所没有的。因此为S_1流
I. INTRODUCTION Since the theory of ternary flow of impeller established by Professor Wu Zhonghua has been widely used in the aerodynamic design of impeller, the method of solving ternary iterations of S 1 and S 2 has been rapidly developed. In the quasi-ternary iterative calculation, the projection of the streamline in the meridional plane is continuous. If the inlet and outlet parameters of the far-field and the ring amount of the gap station are given, the flow field at the center of the multi-stage blade can be solved once, Because of the relative movement between the moving and the moving leaves, only a single row of leaf segments with anterior and posterior extension can be calculated under steady flow. The parameter of this extension is not available from the multistage center S_2 flow surface. So for S_1 stream