In this we take care of both shock and friction losses as shown in the fig. as in fig. the steepness of the curve increases at higher mass flow rates because since there will be higher frictional losses at high flow coefficient (Darcy's friction law).
In this we take care of both shock and friction losses as shown in the Figure 5. As seen in the figure the steepness of the curve increases at higher mass flow rates because since there will be higher frictional losses at high flow coefficient (Darcy's friction law).