Which of the following is a pressure compounded turbine?

Concept:

velocity compounding

• In the velocity compounding of turbines, there are more friction losses due to very high velocity in nozzles and less efficiency because ratio of blade velocity to steam velocity is not optimum. >In this type of turbine, compounding is used to reduce the velocity only. It is also called a Curtis turbine.
• For an ideal centrifugal compressor, the pressure rise depends only on the peripheral velocity or tip speed of the blade and not on diameter.
• As the fluid enters the axial flow compressor, the rotor reduces the relative kinetic head of the fluid and adds it to the absolute kinetic head of the fluid i.e. the impact of the rotor on the fluid particles >increases their absolute velocity and thereby reduces the relative velocity between the fluid and the rotor.

Pressure compounding: 

In this type of turbine, compounding is used for reducing the pressure of fluid in more than 1 stage.

Its efficiency is higher than the velocity compounding. It is also called a Rateau turbine.