An application of topological method to analysing the three-dimensional flow in cascades (II)—Topological analysis on the vector field patterns of skin-frictions and section streamlines

With an application of topological analysis, in this paper the skin-friction line patterns on compressor and turbine cascade surfaces are depicted and the streamline patterns of the secondary flow fields in the cross-section of a curved pipe and a turbine cascade are drawn under given conditions. In addition the structures of vortices within three-dimensional viscous flow fields in cascades are analysed.The Project Supported by the National Natural Science Foundation of China