Losses Mechanism In turbomachine...(Denton, 1993)

In turbomachine blade, losses happened due to:-

1. End wall losses
2. Profile losses
3. Tip leakage losses



Entropy formation is the main factor cause efficiency increase or decrease:-

1.Viscous friction in either boundary layers or free shear layers. The latter include the mixing processes in, for example, a leakage jet.
2.Heat transfer across finite temperature differences, e.g. from the mainstream flow to a flow of coolant
3.Nonequilibrium process example in a rapid expansion or shock waves.