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利用两类相对流面理论，应用有限差分法．求解离心叶轮内部流场．根据计算结果找出原机叶轮结构上的不足．并对新改叶轮的内部流场进行了计算．
Using two types of relative surface theory, the finite difference method is applied. Solve the flow field inside the centrifugal impeller. According to the calculation results to find the original machine impeller structural deficiencies. The internal flow field of the new impeller was calculated.