The following equation represents the vorticity induced in the flow of the diffuser by a gradient in total pressure parallel to the axis of the compressor:

 
Ω¯Ω¯2=2V2gp(dptdz)2(rr21)[i¯tanα2r/r2(rr2+1)+j¯]

The ith component is the component of vorticity which is tangent to the flow direction while the jth component is that which is normal to the flow direction. The velocity and vorticity vectors are shown schematically in Fig. 1.

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