In this paper, we examine the inviscid instability of a swirling mixing layer, a circular mixing layer with an additional swirl component which is present only within the shear layer. The mean flow is solved numerically using the boundary layer equations in cylindrical coordinates. Spatial inviscid stability characteristics of the base flow are studied. The results show that swirl significantly enhances the maximum amplification rate for incompressible mixing layers. This enhancement sustains under the compressible conditions. For swirling mixing layers, a significant amount of disturbance energy is extracted from the shear in the swirl component.
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Lu et al. (1999) studied this question.
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