In a Kaplan turbine runner, the number of blades are generally between

Explanation:

Kaplan turbine:

• In Kaplan turbine, water flows parallel to the axis of rotation of the shaft, hence it is called axial flow turbine.
• Head at the inlet of the turbine is the sum of pressure energy and kinetic energy.
• During the flow of water through the runner, a part of pressure energy is converted into kinetic energy.
• It indicates that the Kaplan turbine is a reaction turbine. When the vanes on the hub are adjustable, the turbine is known as the Kaplan turbine.
• When vanes are not adjustable, the turbine is called the propeller turbine. Kaplan turbine components are shown in the figure below.

• Kaplan turbine has adjustable runner blades. Kaplan Turbine has a very small number of blades 3 to 8.

​Important Points

• Francis Turbine has a very large number of blades 16 to 24