Figure 8 Spanwise distribution at the rotor exit: a) Total
pressure; b) Entropy
Indeed, the wakes convected downstream of IGV and blades in addition to
the secondary flows at hub and casing are major sources of entropy
creation. The wakes issued from IGV (Fig. 9) are distorted in the hub
corner of rotor blade due to secondary vortex formed from the suction
side which is dissipated until about one third of span. Also, another
vortex structure exists near the casing which rotates opposite to the
tip flow leakage vortex. The maximum of entropy is associated with the
rotor blade tip flow leakage and the tip vortex. Both IGV wakes and
separations observed in the inter-row spacing are convected through the
rotor blades passages, appearing not fully mixed at the rotor exit.