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计算叶轮叶道内气流的速度和状态，美国宇航局的Ｊ．Ｔ．Ｈａｍｒｉｃｋ［１］首先提出流线理论，以后Ｔ·ｋａｔｓａｎｉｓ［２］ 采用准正交方法建立更一般的速度方程。近来日本九洲大学的Ｙ．ｓｅｎｏｏ又把迴转面的计算精确化［４·１３］。本文改进他们的方法，引入叶片倾斜角ηｎ的概念并认为中间流面与叶片中面形状相似，建立叶道内气流速度梯度方程，它更体现出气流速度分布与流面形状之间的直观联系。同时提议一种求解气流速度分布的逐次逼近法。最后指出如何修正叶轮的形状。
Calculate the velocity and state of airflow in the impeller, NASA J. T. Hamrick [1] first proposed the theory of streamline, after which T katsanis [2] used quasi-orthogonal method to establish a more general velocity equation. Recently, Jiuzhou University in Japan Y. Senoo again calculated the calculation of the gyration surface [4.13]. In this paper, we improved their method and introduced the concept of blade pitch angle ηn. The middle flow surface is similar to the mid-blade shape, and the velocity gradient equation of air flow in the blade is established. It also shows the direct relationship between the velocity distribution and flow shape. At the same time, we propose a successive approximation method to solve the velocity distribution of airflow. Finally, how to correct the shape of the impeller.