The computation of turbomachinery flows

The basic formulations of the quasi-three-dimensional interaction for single or multistage turbomachines are discussed. The approximation with regard to the losses whereby the viscous and turbulent shear stresses are considered as distributed forces (distributed loss model). A finite element method is employed. The spatial approximation involves the separation, through an averaging procedure over the pitch, or altneratively by following a given surface, into through-flow and blade-to-blade flows. The averaging procedure which allows the introduction of the end-wall boundary layer equations and their coupling to the main through-flow is used.