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.