Generation of streamwise vorticity in an asymmetric swirling flow

The behavior of a circumferentially nonuniform swirling flow, which is of interest in connection with the problem of the response of axial compressors to inlet flow distortion, is examined. An analogy is demonstrated between the behavior of classical secondary flow, such as flow in a bent duct, and the inherently three-dimensional effects that occur in an asymmetric swirling flow.