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依据风机叶轮具有的旋转对称性，用 Ｃｎ 群的表示理论，导出了群各不可约子空间的特征方程，方程的阶数低，易计算，更便于工程应用，且群论方法可以给出叶轮的模态特征
According to the rotational symmetry of the fan impeller, the characteristic equations of irreducible subvolumes are derived by using the representation theory of Cn group. The order of the equations is low and easy to calculate, which is more convenient for engineering application. The group theory method can give impeller Of the modal features