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用谱方法中的τ方法研究了不可压无粘轴对称流的空间稳定性问题．以旋拧型（ｓｗｉｒｌｉｎｇｆｌｏｗ）尾涡流和射流（ｊｅｔ）为例，分析了不稳定特性，并与已有的结果作了比较，分析了τ方法的优缺点．
The spatial stability of incompressible, viscous-axisymmetric viscous flow is studied by the τ method in the spectral method. Taking swirling flow vortex and jet as an example, the instability characteristics are analyzed and compared with the existing ones. The advantages and disadvantages of τ method are analyzed.